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Thread: Stitching scans or not???

  1. #11
    Peter De Smidt's Avatar
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    Re: Stitching scans or not???

    Jason, you can use these lenses normally or reversed. The 1x isn't very good at other magnifications. The 2x/.5x is a bit more versatile.
    May tomorrow be a better day.

  2. #12

    Join Date
    Mar 2011
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    Re: Stitching scans or not???

    Quote Originally Posted by Peter De Smidt View Post
    Jason, you can use these lenses normally or reversed. The 1x isn't very good at other magnifications. The 2x/.5x is a bit more versatile.
    Thanks Peter. I’d heard that about the 1x and so only intended that for 35mm. I was planning on using the 2x and 120mm for larger formats.

  3. #13

    Join Date
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    Re: Stitching scans or not???

    Quote Originally Posted by AdamD View Post
    My question to you is, when scanning your negatives, in particular DSLR scanning, what are the advantages of taking multiple photos of your negative and stitch them all together into one very large megapixel photo?
    Adam, let me add that one of the drawbacks DSLR scanning faces is format not matching.

    A DSLR is ideal to scan 35mm as both the DSLR and the film frame are 3:2 aspect ratio.

    Larger formats contain much more informtion and format is not matching, not only the DSLR shot is not able to take all information a 6x7cm frame (157MPix effective for a 6x7cm tmax 100 shot) has...

    https://www.onlandscape.co.uk/2011/1...ra-comparison/

    ...beyond not being able, only a fraction of the sensor pixels are used because aspect ratio is different. All this is even worse for LF. As mentioned, by stitching crops enough you may get all resolution you may want. If you want 10.000 dpi effective this possible with a dslr scanner with an smart setup.



    Attachment 189048

    Attachment 189049


    Here it is explained that using a ($35) reversed enlarger lens you can get insane quality if your setup is smart, say 9000dpi effective with a 3x3 mosaic in 35mm film.

    https://www.largeformatphotography.i...=1#post1490213


    Some people had pitfalls when trying to scan x3 or x5 magnification... but just about applying from basic optic knowledge you to make an smart setup that's very easy to focus: a kid's game as with the reversed lens you have (say) x5 more DOF in the sensor plane.

    To be smart at x5: use a "focus unit" lens like an enlarger lens, internal focusing of regular shooting lenses makes the lens more expensive for the same peformance. Use an enlarger lens also to have a very flat field focused plane. Use it reversed . Fix well camera and focus by elevating more or less the lens the reversed lens for a total precision, this is the smart setup for high performance.

    For LF this is not necessary, best choice is a cheap Epson V850 flatbed (or a used V700), it has no problem and performance is atonishingly good for the LF sizes.
    Last edited by Pere Casals; 23-May-2020 at 04:34.

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