EOS 7D

Discussion in 'Canon EOS Digital SLRs' started by Claude Fortier, May 12, 2021.

  1. Claude Fortier

    Claude Fortier New Member

    Joined:
    Mar 10, 2021
    Messages:
    10
    Equipment:
    EOS 7D Mounted onto my microscope at the top with T2 adapter to photo tub.
    Hey there folks. i've been at this since February now. I learned a lot, and there is a lot I still haven't learned. I'm using my camera on a microscope trinocular photo port at the top. I'm using the camera on manual, and I try to control the light intensity of the scope LED dimmer. when I set the led light to go brighter, it goes brighter for a second or so, then keeps going back to an underexposed shot. any clue as to what I may be doing wrong.
     

  2. johnsey

    johnsey Site Moderator Staff Member Site Supporter

    Joined:
    Apr 21, 2017
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    Location:
    Fargo, ND
    Equipment:
    5dMk4, 5dsR, 5dMk2, 20D, 70-200 2.8L IS, 100mm 2.8 Macro USM, 50mm 1.4, 85mm 1.8, 17-40mm 4.0L, TS-E 24mm 3.5L II, Rokinon 14mm 2.8; Pixma Pro-100
    I have never used a setup like you have but I would imagine that your microscope puts out minimal light. Is this essentially adapter the camera mount and treating the situation as a wide open lens? Again the whole telescope adapter is not something many of us probably have used. I will assume head/adapter is just a pass through and has no aperture.

    Your exposure will need to be long I image to get enough light to expose, have you kept increasing exposure length until its a 1/2 sec 1 sec 2 sec... etc and seen the exposure start to look correct?

    I am in no way surprised if you see what looks correct the camera will show you what your eyes can see though the setup, it will not show you what the exposure will look like with the given ISO/ Shutter and aperture.
     
    Claude Fortier likes this.
  3. Claude Fortier

    Claude Fortier New Member

    Joined:
    Mar 10, 2021
    Messages:
    10
    Equipment:
    EOS 7D Mounted onto my microscope at the top with T2 adapter to photo tub.
    ok, thanks a bunch.
     

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