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Large Format Digital Photography

Started Jan 1, 2019 | Discussions thread
ProfHankD
ProfHankD Veteran Member • Posts: 9,147
Re: Large Format Digital Photography

maxotics wrote:

Hi, I wrote an essay about my 2-year effort into my "DigiTiler". Or, why anyone would want to do super high resolution photography through a large format lens.

https://medium.com/@maxrottersman/large-format-digital-photography-through-my-digitiler-8a94a1099379

Your justification there seems to be based on the idea that Bayer filters imply interpolation that disappears when you use 2x2 pixel blocks as single pixels... but that's wrong. The sensor stack's AA filters essentially reduce lens resolution to closer to that level, but (as per Nyquist) it actually takes 2X the linear sampling frequency to ensure accurate recovery of the signal. One accurately-recorded pixel might take as much as a 2x2 array of 2x2 pixel Bayer blocks to achieve -- a total of 16 sensels per pixel, not just 4. In other words, a 24MP Bayer sensor might often do better, but can really only promise accurately recording a scene with about 1.5MP. Then again, that's also about the quality 135 film delivered.

You might get a kick out of my Large Format Digitalpage, which has a not-too-different discussion. I last updated it in 2013, so maybe it's getting to be time for me to say some more there...?

Incidentally, there is always LargeSense -- who market 4x5 and even 8x10 single-shot digital backs. However, they go the other direction, using very few, but very large, pixels. Then again, most of what they're doing is still B&W....

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