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Thread: DSLR Scanner: Lenses

  1. #61

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    Re: DSLR Scanner: Lenses

    Um, impossible to evaluate without knowing the magnification at which the shot was taken. On my screen, group 6 element 2 is mush, group 6 element 1 is just there. If shot at 1:10, group 6 element 1 is 64 lp/mm. Surely you can do better.

    FWIW, at f/4 a 55/2.8 MicroNikkor AIS should resolve at least 120 lp/mm.

  2. #62

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    Re: DSLR Scanner: Lenses

    Magnification is close to 1:1 as the sensor is APS-C 22.2 14.8 mm, 12.2 effective megapixels, 4,272 2,848.

  3. #63

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    Re: DSLR Scanner: Lenses

    Oh, my. If at 1:1 and my mental arithmetic is correct, group 6 element 1 is 6.4 lp/mm. Oh, my. I hope I've made a mistake. I hope that something in the chain between sensor and my monitor has betrayed you.

  4. #64

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    Re: DSLR Scanner: Lenses

    Let's talk about long side of the shot. At the camera it is sensor length and it is 22 mm. I have measured the the size at the USAF target that was shot to file - it is 24 mm on the glass target. So we have 22:24 that is very close to 1:1. The crop is 400% enlarged for better viewing.

    Bottom line: one can use the setup for DSLR highres scanning with resolution about 3200-3600 dpi on target (put film there instead). You see 3200 dpi, I see 3600 dpi - it's normal when two persons examine the USAF target scan. What's good about all that is that the resolution can be measured.

    I have no idea yet what numbers will be be when I will take a better camera and a better lens. Perhaps two times better? Who knows.

  5. #65

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    Jan 2014
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    Re: DSLR Scanner: Lenses

    i use a rodagon D 74mm (for 1:1)

    i like it very much it destroyed my 90s contax zeiss 60mm makro


    i would rate it 9/10 for this kind of work there is a 2:1 / 1:2 version (sweet spot with the new nikon d3300 24MP DV without AA Filter)

  6. #66

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    Jun 2015
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    Re: DSLR Scanner: Lenses

    Trying to revive an aging thread...

    I have been making a few preliminary and very rudimentary tests with a Ricoh GXR camera with the 50mm Macro lens and APSC sensor, "scanning" medium format negatives and positives.

    I am confused about something:
    According to DP Review, they conclude that the lens has a 0.4% barrel distortion. But when I open the same film-scanned image (Minolta Dimage Multi Pro) and layer the camera-scanned image on top, resize, center, and rotate the images appropriately, then it appears that the Ricoh has a pincushion distortion?? That is assuming that the scanner does not distort anything, which I assume it shouldn't.

    Is this possible? Did I miss the point of distortion somewhere?

    Confused.

  7. #67
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    Re: DSLR Scanner: Lenses

    Quote Originally Posted by drtebi View Post
    Trying to revive an aging thread...

    I have been making a few preliminary and very rudimentary tests with a Ricoh GXR camera with the 50mm Macro lens and APSC sensor, "scanning" medium format negatives and positives.

    I am confused about something:
    According to DP Review, they conclude that the lens has a 0.4% barrel distortion. But when I open the same film-scanned image (Minolta Dimage Multi Pro) and layer the camera-scanned image on top, resize, center, and rotate the images appropriately, then it appears that the Ricoh has a pincushion distortion?? That is assuming that the scanner does not distort anything, which I assume it shouldn't.

    Is this possible? Did I miss the point of distortion somewhere?

    Confused.
    It may be that the lens has barrel distortion at infinity and pincushion at 1:1.

    Rick "who created his own corrections in Photoshop" Denney

  8. #68

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    Aug 2010
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    Re: DSLR Scanner: Lenses

    Up!

    Rodenstock lenses used in Scitex Smart 340, Smart 342, Smart 340L, Smart 342L scanners:

    Rogonar-S 5.6/60 for scanning A3, A4, 8x10". Optical magnification 0.111.
    Scitex S-3 4.9/67 for scanning 4x5". Optical magnification 0.215.
    Scitex S-3 5.0/89 for scanning 6x6cm, 6x7cm, 6x9cm. Optical magnification 0.376.
    Scitex S-3 5.0/110 for scanning 35mm. Optical magnification 0.726.
    Rodagon 5.6/80 for scanning 10cm stripes LW. Optical magnification 0.346.

  9. #69

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    Aug 2010
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    Re: DSLR Scanner: Lenses

    Some tests of those lenses. Optical magnification 1:1.5 (36x24mm to 24x16mm 16Mp Sony Nex).

    Let's start: Rodenstock Rodagon f5.6, 80mm. Does not look very APO, but sharp and with a good contrast. Center and corner 100% crop.
    Attached Thumbnails Attached Thumbnails Rodagon-80mm-f5.6-corner.jpg   Rodagon-80mm-f5.6-center.jpg  

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