Film's true DPI?

[Pherdinand]

You are right about the grain being big enough at a higher magnification..
The question is, however, do you want a large grainy print with sharp grains (high-rez scanning/printing), or do you want a large grainy print with very blurry grains (low-rez scan, upscaled for print)?

 

[Pherdinand]

The digital camera replaced medium format long before the 1DsMIII came along.

OWW you're scaring me! Have to go now and check if my rolleiflex is still a rolleiflex...and how about my "new" fuji 6x9 rf? I hope it didn't transform into some kind of HP SUpercoolshot PZT550 Zoom Megapixel Camera!

Really, beautiful film grain deserves a scan of high resolution imo.
Your 200% blow-up image, varjag, is weird - i see pixelation and strong anti-aliasing in it, seems more like you linearly upscaled a low-rez scan image ...

 

[varjag]

You have to add the scanner (output stage) too as a third factor (5000dpi = 99lp/mm), which drops the result from 50 to 33.

Ah, so that's where it comes from. Well, good point.

However, in same vein, we really should also measure the resolution of CCD+lens system, just as we do for film. Unless one contact prints test targets on the sensor of course 🙂

 

[varjag]

Your 200% blow-up image, varjag, is weird - i see pixelation and strong anti-aliasing in it, seems more like you linearly upscaled a low-rez scan image ...

Of course there is upsampling and pixelation, it's 200% crop FFS. Done so as to clearly make pixel boundaries visible.

 

[Pherdinand]

ok i think i misunderstood your point before. My bad.