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Thread: DSLR Scanner: Lenses

  1. #51

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    Re: DSLR Scanner: Lenses

    Peter... That's what I did but the seller has that disabled. I received an auto-reply stating "...unfortunately the seller cannot reply..." blah blah blah.

  2. #52
    Peter De Smidt's Avatar
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    Re: DSLR Scanner: Lenses

    If you go to the <About the Seller> link, it'll take you to a page that lists their email address along with a live chat option.

    “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. #53

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    Re: DSLR Scanner: Lenses

    Thanks, Peter. I sent them an email.

  4. #54
    Peter De Smidt's Avatar
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    Re: DSLR Scanner: Lenses

    Make sure you read the macro forum posts about the lens. At that magnification, it's very specialized. Without the ability to do focus stacking with less than 10 micron steps, you won't get very good images. With a dlsr scanner, it would mostly be useful for film/developer tests, where the idea would be to capture one tile of the film, as opposed to covering the whole negative, which would require a huge number of tiles. That said, how an image looks when printed at it's final size is much more important than how the film looks under a microscope.
    “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

  5. #55

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    Re: DSLR Scanner: Lenses

    Peter... Since it's optimized for 20x I was hoping it would perform well at 4x or so but that may not be.

  6. #56
    Peter De Smidt's Avatar
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    Re: DSLR Scanner: Lenses

    Quote Originally Posted by Old-N-Feeble View Post
    Peter... Since it's optimized for 20x I was hoping it would perform well at 4x or so but that may not be.
    I doubt that it would be any good at all at 4x. If that's the goal, there are some better options. I posted some examples from an inexpensive 4x objective and some info in posts 3 and 5 of this thread.

    None the less, for general scanning use, something like a standard 60mm macro, especially one that goes to 1:1 with autofocus, would be by far the easiest to use. Ideally, you'll be able to focus from a tethered computer. If you go much above 1:1 magnification, you'll need to use focus stacking for good results, and that greatly increases the complexity and cost of the project. For large format work, it would also be overkill.
    “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

  7. #57

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    Re: DSLR Scanner: Lenses

    Thank you, Peter. I need to take more notes so I can keep up.

  8. #58

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    Re: DSLR Scanner: Lenses

    I saw the following lens on the 'bay but didn't bid on it because I had other plans for my money and I don't know anything about it. My guess is one like it could be very promising.

    The title begins with "Kodak Printing Ektar 103mm" and it's a recently completed auction.

  9. #59

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    Re: DSLR Scanner: Lenses

    I have tried to make a picture of the USAF resolution target with a Canon D450 (12 Mp), extention rings and some lens. It worked. The size on the target was about 24 mm x 16 mm. Was possible to get at least 3600 dpi (see the 400% crop). Really not bad.Click image for larger version. 

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  10. #60
    Peter De Smidt's Avatar
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    Re: DSLR Scanner: Lenses

    Hi Surf, Thanks for the test.
    “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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