How can I set the aperture on my DSLR when it's attached to a telescope instead of a lens? Announcing the arrival of Valued Associate #679: Cesar Manara Planned maintenance scheduled April 23, 2019 at 23:30 UTC (7:30pm US/Eastern) Proposal: Rules for *New* Photo Contest on Main SiteCan I shoot a photo with my DSLR without the lens on?Why does my DSLR's viewfinder ignore the aperture ring on a legacy lens?DSLRs with separate controls for aperture and shutter?How to calculate the size of the image circle at infinity focus?Canon: Setting exposure compensation in M mode?Can a Samsung NX300 shoot without a lens, for attaching to a telescope?Where can I find the maximum camera weight for my lens?How do I force my Canon dSLR (800D) to take a photo?How can I achieve more clarity in my photos of the moon?How can I get consistent exposure while allowing aperture changes on Fujifilm X-T2?

Do chord progressions usually move by fifths?

Protagonist's race is hidden - should I reveal it?

Unix AIX passing variable and arguments to expect and spawn

How is an IPA symbol that lacks a name (e.g. ɲ) called?

How do I overlay a PNG over two videos (one video overlays another) in one command using FFmpeg?

Does using the Inspiration rules for character defects encourage My Guy Syndrome?

Reflections in a Square

Why is ArcGIS Pro not symbolizing my entire range of values?

Is Bran literally the world's memory?

What is the ongoing value of the Kanban board to the developers as opposed to management

Why these surprising proportionalities of integrals involving odd zeta values?

Can a Knight grant Knighthood to another?

Has a Nobel Peace laureate ever been accused of war crimes?

Is my guitar’s action too high?

Why doesn't the university give past final exams' answers?

Why did Europeans not widely domesticate foxes?

Why do C and C++ allow the expression (int) + 4*5?

Weaponising the Grasp-at-a-Distance spell

xkeyval -- read keys from file

How do I deal with an erroneously large refund?

lm and glm function in R

What documents does someone with a long-term visa need to travel to another Schengen country?

Can I take recommendation from someone I met at a conference?

How to get a single big right brace?



How can I set the aperture on my DSLR when it's attached to a telescope instead of a lens?



Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 23, 2019 at 23:30 UTC (7:30pm US/Eastern)
Proposal: Rules for *New* Photo Contest on Main SiteCan I shoot a photo with my DSLR without the lens on?Why does my DSLR's viewfinder ignore the aperture ring on a legacy lens?DSLRs with separate controls for aperture and shutter?How to calculate the size of the image circle at infinity focus?Canon: Setting exposure compensation in M mode?Can a Samsung NX300 shoot without a lens, for attaching to a telescope?Where can I find the maximum camera weight for my lens?How do I force my Canon dSLR (800D) to take a photo?How can I achieve more clarity in my photos of the moon?How can I get consistent exposure while allowing aperture changes on Fujifilm X-T2?



.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;








3















I would like to use my Nikon D3100 for astrophotography. I have attached the camera to my telescope with a T-ring, after which the camera recognized the absence of the lens, which is perfectly normal. However, without the lens on, I am unable to adjust the aperture, which is extremely important for astrophotography. I can set the ISO, the shutter speed, and some other, minor things but not the Aperture.



I’m using the camera in manual mode.



Is setting the aperture without the lens even possible?










share|improve this question









New contributor




Gergely Kovacs is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.




















  • I had misunderstood how aperture works big time. Thank you guys for clearing that up. It makes sense now.

    – Gergely Kovacs
    yesterday

















3















I would like to use my Nikon D3100 for astrophotography. I have attached the camera to my telescope with a T-ring, after which the camera recognized the absence of the lens, which is perfectly normal. However, without the lens on, I am unable to adjust the aperture, which is extremely important for astrophotography. I can set the ISO, the shutter speed, and some other, minor things but not the Aperture.



I’m using the camera in manual mode.



Is setting the aperture without the lens even possible?










share|improve this question









New contributor




Gergely Kovacs is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.




















  • I had misunderstood how aperture works big time. Thank you guys for clearing that up. It makes sense now.

    – Gergely Kovacs
    yesterday













3












3








3


2






I would like to use my Nikon D3100 for astrophotography. I have attached the camera to my telescope with a T-ring, after which the camera recognized the absence of the lens, which is perfectly normal. However, without the lens on, I am unable to adjust the aperture, which is extremely important for astrophotography. I can set the ISO, the shutter speed, and some other, minor things but not the Aperture.



I’m using the camera in manual mode.



Is setting the aperture without the lens even possible?










share|improve this question









New contributor




Gergely Kovacs is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.












I would like to use my Nikon D3100 for astrophotography. I have attached the camera to my telescope with a T-ring, after which the camera recognized the absence of the lens, which is perfectly normal. However, without the lens on, I am unable to adjust the aperture, which is extremely important for astrophotography. I can set the ISO, the shutter speed, and some other, minor things but not the Aperture.



I’m using the camera in manual mode.



Is setting the aperture without the lens even possible?







dslr camera-settings astrophotography






share|improve this question









New contributor




Gergely Kovacs is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question









New contributor




Gergely Kovacs is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









share|improve this question




share|improve this question








edited Apr 19 at 22:57









Michael C

135k7154384




135k7154384






New contributor




Gergely Kovacs is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









asked Apr 19 at 18:55









Gergely KovacsGergely Kovacs

1183




1183




New contributor




Gergely Kovacs is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





New contributor





Gergely Kovacs is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






Gergely Kovacs is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.












  • I had misunderstood how aperture works big time. Thank you guys for clearing that up. It makes sense now.

    – Gergely Kovacs
    yesterday

















  • I had misunderstood how aperture works big time. Thank you guys for clearing that up. It makes sense now.

    – Gergely Kovacs
    yesterday
















I had misunderstood how aperture works big time. Thank you guys for clearing that up. It makes sense now.

– Gergely Kovacs
yesterday





I had misunderstood how aperture works big time. Thank you guys for clearing that up. It makes sense now.

– Gergely Kovacs
yesterday










2 Answers
2






active

oldest

votes


















9















Is setting the aperture without the lens even possible?




Considering that the aperture is a part of the lens, not the camera body, no, it is not possible.



Telescopes do not typically have variable apertures — there's no need to stop down to limit incoming light (which is absolutely the opposite of what is wanted for star photography), and depth of field control is meaningless when all objects are no closer than the moon.



The aperture of the telescope is the diameter of the front element. In ƒ-number terms, it is the ratio of the focal length of the telescope divided by the diameter of the front element. Be sure to use the same units (i.e., inches, or mm/cm/m).






share|improve this answer

























  • I'm not sure about OP's camera - but I know some may refuse to shoot when no aperture is selected in certain modes. Do you know if this affects the D3100?

    – Hueco
    Apr 19 at 22:12






  • 1





    @Hueco not sure precisely. It never occurred to me to use a t-mounted camera in anything other than manual mode. I had no problems shooting manual with a D90 mounted on a telescope, nor with my D800E on a scope.

    – scottbb
    Apr 19 at 22:31











  • This is not entirely true--you could use an additional aperture inline between the objective and the flange.

    – chrylis
    2 days ago






  • 1





    @chrylis Well, I did use the weasel phrase "telescopes do not typically have variable apertures"... =) But regardless, the bigger point is that apertures are not a part of the camera.

    – scottbb
    2 days ago











  • WHAT aperture? A lens has focal length and aperture. The telescope is now the lens. As I understand telescopes, you pay money to get as LARGE an aperture as possible! Why is it important to adjust it?

    – Laurence Payne
    2 days ago


















5














Check your telescope manual and find the telescope's aperture. Assuming no telescope eyepiece is utilized, the camera is said to be at the "prime focus" position. Find the scope's diameter. Find the scope's focal length. Divide focal length by diameter. The results of this math is the working f number of the system. Example: 1000mm focal length 4 inch diameter. Convert all units to millimeters. Inches to millimeters conversion is 25.4. Thus 1000 / (4 X 25.4) = 1000 / 101.6 = 9.8. Round to f/10. By the way, f/10 is typical of most systems.






share|improve this answer























    Your Answer








    StackExchange.ready(function()
    var channelOptions =
    tags: "".split(" "),
    id: "61"
    ;
    initTagRenderer("".split(" "), "".split(" "), channelOptions);

    StackExchange.using("externalEditor", function()
    // Have to fire editor after snippets, if snippets enabled
    if (StackExchange.settings.snippets.snippetsEnabled)
    StackExchange.using("snippets", function()
    createEditor();
    );

    else
    createEditor();

    );

    function createEditor()
    StackExchange.prepareEditor(
    heartbeatType: 'answer',
    autoActivateHeartbeat: false,
    convertImagesToLinks: false,
    noModals: true,
    showLowRepImageUploadWarning: true,
    reputationToPostImages: null,
    bindNavPrevention: true,
    postfix: "",
    imageUploader:
    brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
    contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
    allowUrls: true
    ,
    noCode: true, onDemand: true,
    discardSelector: ".discard-answer"
    ,immediatelyShowMarkdownHelp:true
    );



    );






    Gergely Kovacs is a new contributor. Be nice, and check out our Code of Conduct.









    draft saved

    draft discarded


















    StackExchange.ready(
    function ()
    StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fphoto.stackexchange.com%2fquestions%2f106699%2fhow-can-i-set-the-aperture-on-my-dslr-when-its-attached-to-a-telescope-instead%23new-answer', 'question_page');

    );

    Post as a guest















    Required, but never shown

























    2 Answers
    2






    active

    oldest

    votes








    2 Answers
    2






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    9















    Is setting the aperture without the lens even possible?




    Considering that the aperture is a part of the lens, not the camera body, no, it is not possible.



    Telescopes do not typically have variable apertures — there's no need to stop down to limit incoming light (which is absolutely the opposite of what is wanted for star photography), and depth of field control is meaningless when all objects are no closer than the moon.



    The aperture of the telescope is the diameter of the front element. In ƒ-number terms, it is the ratio of the focal length of the telescope divided by the diameter of the front element. Be sure to use the same units (i.e., inches, or mm/cm/m).






    share|improve this answer

























    • I'm not sure about OP's camera - but I know some may refuse to shoot when no aperture is selected in certain modes. Do you know if this affects the D3100?

      – Hueco
      Apr 19 at 22:12






    • 1





      @Hueco not sure precisely. It never occurred to me to use a t-mounted camera in anything other than manual mode. I had no problems shooting manual with a D90 mounted on a telescope, nor with my D800E on a scope.

      – scottbb
      Apr 19 at 22:31











    • This is not entirely true--you could use an additional aperture inline between the objective and the flange.

      – chrylis
      2 days ago






    • 1





      @chrylis Well, I did use the weasel phrase "telescopes do not typically have variable apertures"... =) But regardless, the bigger point is that apertures are not a part of the camera.

      – scottbb
      2 days ago











    • WHAT aperture? A lens has focal length and aperture. The telescope is now the lens. As I understand telescopes, you pay money to get as LARGE an aperture as possible! Why is it important to adjust it?

      – Laurence Payne
      2 days ago















    9















    Is setting the aperture without the lens even possible?




    Considering that the aperture is a part of the lens, not the camera body, no, it is not possible.



    Telescopes do not typically have variable apertures — there's no need to stop down to limit incoming light (which is absolutely the opposite of what is wanted for star photography), and depth of field control is meaningless when all objects are no closer than the moon.



    The aperture of the telescope is the diameter of the front element. In ƒ-number terms, it is the ratio of the focal length of the telescope divided by the diameter of the front element. Be sure to use the same units (i.e., inches, or mm/cm/m).






    share|improve this answer

























    • I'm not sure about OP's camera - but I know some may refuse to shoot when no aperture is selected in certain modes. Do you know if this affects the D3100?

      – Hueco
      Apr 19 at 22:12






    • 1





      @Hueco not sure precisely. It never occurred to me to use a t-mounted camera in anything other than manual mode. I had no problems shooting manual with a D90 mounted on a telescope, nor with my D800E on a scope.

      – scottbb
      Apr 19 at 22:31











    • This is not entirely true--you could use an additional aperture inline between the objective and the flange.

      – chrylis
      2 days ago






    • 1





      @chrylis Well, I did use the weasel phrase "telescopes do not typically have variable apertures"... =) But regardless, the bigger point is that apertures are not a part of the camera.

      – scottbb
      2 days ago











    • WHAT aperture? A lens has focal length and aperture. The telescope is now the lens. As I understand telescopes, you pay money to get as LARGE an aperture as possible! Why is it important to adjust it?

      – Laurence Payne
      2 days ago













    9












    9








    9








    Is setting the aperture without the lens even possible?




    Considering that the aperture is a part of the lens, not the camera body, no, it is not possible.



    Telescopes do not typically have variable apertures — there's no need to stop down to limit incoming light (which is absolutely the opposite of what is wanted for star photography), and depth of field control is meaningless when all objects are no closer than the moon.



    The aperture of the telescope is the diameter of the front element. In ƒ-number terms, it is the ratio of the focal length of the telescope divided by the diameter of the front element. Be sure to use the same units (i.e., inches, or mm/cm/m).






    share|improve this answer
















    Is setting the aperture without the lens even possible?




    Considering that the aperture is a part of the lens, not the camera body, no, it is not possible.



    Telescopes do not typically have variable apertures — there's no need to stop down to limit incoming light (which is absolutely the opposite of what is wanted for star photography), and depth of field control is meaningless when all objects are no closer than the moon.



    The aperture of the telescope is the diameter of the front element. In ƒ-number terms, it is the ratio of the focal length of the telescope divided by the diameter of the front element. Be sure to use the same units (i.e., inches, or mm/cm/m).







    share|improve this answer














    share|improve this answer



    share|improve this answer








    edited Apr 19 at 19:20

























    answered Apr 19 at 19:07









    scottbbscottbb

    21k75896




    21k75896












    • I'm not sure about OP's camera - but I know some may refuse to shoot when no aperture is selected in certain modes. Do you know if this affects the D3100?

      – Hueco
      Apr 19 at 22:12






    • 1





      @Hueco not sure precisely. It never occurred to me to use a t-mounted camera in anything other than manual mode. I had no problems shooting manual with a D90 mounted on a telescope, nor with my D800E on a scope.

      – scottbb
      Apr 19 at 22:31











    • This is not entirely true--you could use an additional aperture inline between the objective and the flange.

      – chrylis
      2 days ago






    • 1





      @chrylis Well, I did use the weasel phrase "telescopes do not typically have variable apertures"... =) But regardless, the bigger point is that apertures are not a part of the camera.

      – scottbb
      2 days ago











    • WHAT aperture? A lens has focal length and aperture. The telescope is now the lens. As I understand telescopes, you pay money to get as LARGE an aperture as possible! Why is it important to adjust it?

      – Laurence Payne
      2 days ago

















    • I'm not sure about OP's camera - but I know some may refuse to shoot when no aperture is selected in certain modes. Do you know if this affects the D3100?

      – Hueco
      Apr 19 at 22:12






    • 1





      @Hueco not sure precisely. It never occurred to me to use a t-mounted camera in anything other than manual mode. I had no problems shooting manual with a D90 mounted on a telescope, nor with my D800E on a scope.

      – scottbb
      Apr 19 at 22:31











    • This is not entirely true--you could use an additional aperture inline between the objective and the flange.

      – chrylis
      2 days ago






    • 1





      @chrylis Well, I did use the weasel phrase "telescopes do not typically have variable apertures"... =) But regardless, the bigger point is that apertures are not a part of the camera.

      – scottbb
      2 days ago











    • WHAT aperture? A lens has focal length and aperture. The telescope is now the lens. As I understand telescopes, you pay money to get as LARGE an aperture as possible! Why is it important to adjust it?

      – Laurence Payne
      2 days ago
















    I'm not sure about OP's camera - but I know some may refuse to shoot when no aperture is selected in certain modes. Do you know if this affects the D3100?

    – Hueco
    Apr 19 at 22:12





    I'm not sure about OP's camera - but I know some may refuse to shoot when no aperture is selected in certain modes. Do you know if this affects the D3100?

    – Hueco
    Apr 19 at 22:12




    1




    1





    @Hueco not sure precisely. It never occurred to me to use a t-mounted camera in anything other than manual mode. I had no problems shooting manual with a D90 mounted on a telescope, nor with my D800E on a scope.

    – scottbb
    Apr 19 at 22:31





    @Hueco not sure precisely. It never occurred to me to use a t-mounted camera in anything other than manual mode. I had no problems shooting manual with a D90 mounted on a telescope, nor with my D800E on a scope.

    – scottbb
    Apr 19 at 22:31













    This is not entirely true--you could use an additional aperture inline between the objective and the flange.

    – chrylis
    2 days ago





    This is not entirely true--you could use an additional aperture inline between the objective and the flange.

    – chrylis
    2 days ago




    1




    1





    @chrylis Well, I did use the weasel phrase "telescopes do not typically have variable apertures"... =) But regardless, the bigger point is that apertures are not a part of the camera.

    – scottbb
    2 days ago





    @chrylis Well, I did use the weasel phrase "telescopes do not typically have variable apertures"... =) But regardless, the bigger point is that apertures are not a part of the camera.

    – scottbb
    2 days ago













    WHAT aperture? A lens has focal length and aperture. The telescope is now the lens. As I understand telescopes, you pay money to get as LARGE an aperture as possible! Why is it important to adjust it?

    – Laurence Payne
    2 days ago





    WHAT aperture? A lens has focal length and aperture. The telescope is now the lens. As I understand telescopes, you pay money to get as LARGE an aperture as possible! Why is it important to adjust it?

    – Laurence Payne
    2 days ago













    5














    Check your telescope manual and find the telescope's aperture. Assuming no telescope eyepiece is utilized, the camera is said to be at the "prime focus" position. Find the scope's diameter. Find the scope's focal length. Divide focal length by diameter. The results of this math is the working f number of the system. Example: 1000mm focal length 4 inch diameter. Convert all units to millimeters. Inches to millimeters conversion is 25.4. Thus 1000 / (4 X 25.4) = 1000 / 101.6 = 9.8. Round to f/10. By the way, f/10 is typical of most systems.






    share|improve this answer



























      5














      Check your telescope manual and find the telescope's aperture. Assuming no telescope eyepiece is utilized, the camera is said to be at the "prime focus" position. Find the scope's diameter. Find the scope's focal length. Divide focal length by diameter. The results of this math is the working f number of the system. Example: 1000mm focal length 4 inch diameter. Convert all units to millimeters. Inches to millimeters conversion is 25.4. Thus 1000 / (4 X 25.4) = 1000 / 101.6 = 9.8. Round to f/10. By the way, f/10 is typical of most systems.






      share|improve this answer

























        5












        5








        5







        Check your telescope manual and find the telescope's aperture. Assuming no telescope eyepiece is utilized, the camera is said to be at the "prime focus" position. Find the scope's diameter. Find the scope's focal length. Divide focal length by diameter. The results of this math is the working f number of the system. Example: 1000mm focal length 4 inch diameter. Convert all units to millimeters. Inches to millimeters conversion is 25.4. Thus 1000 / (4 X 25.4) = 1000 / 101.6 = 9.8. Round to f/10. By the way, f/10 is typical of most systems.






        share|improve this answer













        Check your telescope manual and find the telescope's aperture. Assuming no telescope eyepiece is utilized, the camera is said to be at the "prime focus" position. Find the scope's diameter. Find the scope's focal length. Divide focal length by diameter. The results of this math is the working f number of the system. Example: 1000mm focal length 4 inch diameter. Convert all units to millimeters. Inches to millimeters conversion is 25.4. Thus 1000 / (4 X 25.4) = 1000 / 101.6 = 9.8. Round to f/10. By the way, f/10 is typical of most systems.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Apr 19 at 20:59









        Alan MarcusAlan Marcus

        26.1k33060




        26.1k33060




















            Gergely Kovacs is a new contributor. Be nice, and check out our Code of Conduct.









            draft saved

            draft discarded


















            Gergely Kovacs is a new contributor. Be nice, and check out our Code of Conduct.












            Gergely Kovacs is a new contributor. Be nice, and check out our Code of Conduct.











            Gergely Kovacs is a new contributor. Be nice, and check out our Code of Conduct.














            Thanks for contributing an answer to Photography Stack Exchange!


            • Please be sure to answer the question. Provide details and share your research!

            But avoid


            • Asking for help, clarification, or responding to other answers.

            • Making statements based on opinion; back them up with references or personal experience.

            To learn more, see our tips on writing great answers.




            draft saved


            draft discarded














            StackExchange.ready(
            function ()
            StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fphoto.stackexchange.com%2fquestions%2f106699%2fhow-can-i-set-the-aperture-on-my-dslr-when-its-attached-to-a-telescope-instead%23new-answer', 'question_page');

            );

            Post as a guest















            Required, but never shown





















































            Required, but never shown














            Required, but never shown












            Required, but never shown







            Required, but never shown

































            Required, but never shown














            Required, but never shown












            Required, but never shown







            Required, but never shown







            Popular posts from this blog

            Grendel Contents Story Scholarship Depictions Notes References Navigation menu10.1093/notesj/gjn112Berserkeree

            Area configuration aggregation error after install Porto themeMagento 2.1 CE Installed but front/backend not loading/workingCSS not loading on page within Magento 2 pageCannot install module in Magento 2no commands defined in the “setup” namespace. in Magento2Magento 2: Static files are present but shows 404Why do i have to always run the commands to clean cache in Magento 2.1.8?Failure reason: 'Unable to unserialize value.'Error 500 after magento migrationIn production mode the site does not loadMagento 2 : Error 500 after installing

            Middle Expansion Olielle Resaix Definition: Uttering songs of triumph shouting with joy triumphant exulting Sejunction Journal 붙다 달 고급 품목 외출 The stretch trades the screeching tin. Definition: The act of speaking with a drawl a drawl Cough Sand Definition: An uproar a quarrel a noisy outbreak Shake Iron Publicize Horse House Baby 사과 Resaix Flaggy Jelly Temporary Unequaled Puppet A drop in the bucket Shrew 성격 회원 성질 미팅 The burn frames the tacky quality. Materialistic The smoke reduces the way. Yammoe Nondescript Cheek 얼굴 배 약하다 날리다 타다 The illegal country shows the iron. Help Rule Drearien Smoke Teaching Meaty Wasp Abraham Lincoln Jaws 진심 수리하다 Size Cork Idea Convert Think Lark John Lennon 거울 청소 군 추천하다 아이스크림