[rollei_list] Re: OT / prove it !
- From: "Austin Franklin" <austin@xxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Thu, 31 Mar 2005 21:44:05 -0500
Hi Eric,
> Yes. Even at 5 x 7, the smaller format suffers by comparison.
"suffers". Kind of dramatic. 35mm can easily be equally as sharp as MF at
5x7 and even up to 8x10 and perhaps beyond. When talking grain or tonality,
that's a different story, you can still have very sharp prints, but start to
see grain. Obviously, this is film dependant (film
choice/exposure/development/shutter speed/camera shake etc.).
If human visual acuity is 1 arc minute (which is the definition of 20/20
vision), that corresponds to .0029" at a distance of 10" from the eye. That
is 6.88 lp/mm. So, the most you can distinguish from an 8x10 print held 10
inches from your face is 175 lp/inch, or 1400 x 1750.
To match human visual acuity of an 8x10 at 10" with 35mm, you would have to
have only recorded 55 lp/mm on the film. Hardly unreasonable to do so on
35mm film.
So, unless you're a really shaky dude and working from a really out of focus
image, I can't imagine how you can see any difference in sharpness on a 5x7
print made from a 35mm vs a 5x7 made from a Rollei.
Regards,
Austin
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