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Thread: DSLR Scanner: Camera Supports and Positioning

  1. #61

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    Re: DSLR Scanner: Camera Supports and Positioning

    I think I'll look for a flash option for lighting.

  2. #62
    Peter De Smidt's Avatar
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    Re: DSLR Scanner: Camera Supports and Positioning

    Quote Originally Posted by Old-N-Feeble View Post
    I think I'll look for a flash option for lighting.
    Then most cameras should be fine.

    I have a 150mm El Nikkor too. I'll get around to testing it in this application eventually. It would need quite a bit of extension to get to 1:1, though.
    “You often feel tired, not because you've done too much, but because you've done too little of what sparks a light in you.”
    ― Alexander Den Heijer, Nothing You Don't Already Know

  3. #63

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    Re: DSLR Scanner: Camera Supports and Positioning

    RE 150mm El Nikkor. I eagerly await seeing your tests. You'll be using the center of a very sharp and well-corrected lens. Hopefully, it'll be perform well enough for this purpose.

  4. #64
    joseph
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    Re: DSLR Scanner: Camera Supports and Positioning

    Quote Originally Posted by Peter J. De Smidt View Post

    ... That means that the depth of field for this combo is 0.008 inches.
    How did you guys get to the moon using slide rules and feet and inches...

    So, about 0.2mm, sounds about right-
    There are a lot of numbers in your post, but I couldn't find a mention of aperture?

    I've done some more lens testing, I suppose I should update one of the threads.

  5. #65
    Peter De Smidt's Avatar
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    Re: DSLR Scanner: Camera Supports and Positioning

    Joseph, the lens was set to F5.6. I look forward to seeing the results of your testing!
    “You often feel tired, not because you've done too much, but because you've done too little of what sparks a light in you.”
    ― Alexander Den Heijer, Nothing You Don't Already Know

  6. #66

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    Re: DSLR Scanner: Camera Supports and Positioning

    Quote Originally Posted by jb7 View Post
    How did you guys get to the moon using slide rules and feet and inches...
    We didn't go to the moon. Don't you ever read the conspiracy theory websites??

    Oh... and Kodak designed and manufactured their crappy Ektar lenses using slide rules with "inch" measurements. Oh... and Henry Ford only made cars with SAE nuts and bolts. Oh... and we derived our measurements from da' English.

  7. #67

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    Re: DSLR Scanner: Camera Supports and Positioning

    At what aperture does diffraction kick in on that lens at 1:1 with your setup? It would be nice to have a bit more then 0.2mm. I guess it would double at f11? Thats what math tells me. Interesting to see what the trade off is in a real situation. Loss of some overall resolution due to diffraction but gaining overall sharpness due to increased dof. Unless of course 0.2 mm is within the margins of what your machine can perform. 0.2mm is pretty tight though. Need to really get that neg flat and the movement precise.

  8. #68
    Peter De Smidt's Avatar
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    Re: DSLR Scanner: Camera Supports and Positioning

    With my 55mm Nikkor reversed and at 1:1, the best aperture turns out to be F8. Both F5.6 and F11 are a bit softer, with the move from f8 to f11 being a bigger difference. My interpretation is that the lens aberrations are being minimized with the move from f5.6 to F8, whereas diffraction is affecting the results at F11. Since my earlier DOF tests were done at F5.6, this means that with my lens at the better F8, we'll have a bit more DOF to play with. I'll check the dof empirically soon.

    One thing to note: When doing these tests you have to check for best focus whenever you change aperture. It wasn't a huge difference, but it did affect the result, although the biggest change was from wide open (f3.5) to f5.6. Other lenses might not have a focus shift.
    “You often feel tired, not because you've done too much, but because you've done too little of what sparks a light in you.”
    ― Alexander Den Heijer, Nothing You Don't Already Know

  9. #69

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    Re: DSLR Scanner: Camera Supports and Positioning

    Just found this: http://www.flickr.com/photos/13084997@N03/3145125097/
    Interesting idea. I have loads of dead harddrives. Any ideas on other cheap electronic external shutters?

  10. #70
    Peter De Smidt's Avatar
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    Re: DSLR Scanner: Camera Supports and Positioning

    There were a number of different LF electric shutters made.
    “You often feel tired, not because you've done too much, but because you've done too little of what sparks a light in you.”
    ― Alexander Den Heijer, Nothing You Don't Already Know

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