Digital BW, The Print

Typically, what you are calling "real" resolution has nothing to do with the
lense, but the shooting environment...which I believe Erwin probably states
in his "discussion".

He (Erwin) also has a writeup on digital image sensors vs 35mm film, and if
I remember correctly, he also came up with 100M...basically the same way I
did...

Aside from that, let's give 40 lp/mm as the maximum "PRACTICALLY usable"
resolution for 35mm photography...  Any of this is quite easy to
calculate...

40 lp/mm is 80 lines/mm.  But...to actually reliably resolve 80 lines/mm,
you need to sample at 2x that, or 160 lines/mm...and that only is on axis,
off axis you need 1.4x, or 224 lines/mm...  24mm x 224 x 36mm x 224 =
43,352,064 or 43M pixels...and this doesn't take into account that a single
shot sensor only contains %25 real color information...so to get 43M REAL
color pixels, you'd some multiplication of that...

The real answer is, it depends on what your goal is.  If it's happy snaps,
then 6M pixel sensors or less will do just fine.  If it's high resolution
imaging...then 100M pixels is the answer...it your goal is somewhere
in-between, then something in-between will, obviously, work just fine.

Also, remember, that for some, even the best 35mm doesn't even cut
it...which is why some (my self included) shoot medium format.

Austin

> -----Original Message-----
> From: Derek Clarke [mailto:derek_c@...]
> Sent: Tuesday, January 29, 2002 9:45 AM
> To: DigitalBlackandWhiteThePrint@yahoogroups.com
> Subject: Re: [Digital BW] From the horses mouth.
>
>
> I said the real resolution, i.e. that achievable in a real camera
> with the
> medium of your choice, rather than the theoretical figures
> obtained with an
> MTF machine.
>
> http://www.imx.nl/photosite/technical/highres.html is quite a
> good discussion
> of the resolution issues.
>
> On Tuesday 29 Jan 2002 2:18 pm, Austin Franklin wrote:
> > Derek,
> >
> > > ...because the real resolution of
> > > 35mm lenses
> > > simply doesn't match that high a figure.
> >
> > High end primes can go well over 100 lp/mm...  BTW, have you
> seen gigabit
> > film?  Obviously, there are lenses that can accommodate that film.
> >
> > Austin
> >
> >
> > Please visit the Group Homepage to check the Files, Bookmarks, Polls and
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> >
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> >
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Please visit the Group Homepage to check the Files, Bookmarks, Polls and
other resources as they are often being updated. The page is at:

http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint

Please follow these basic guidelines:
- Include your full name with your message.
- Include the address of your website, if you have one.
- As threads develop, trim off excess portions of earlier messages to keep
them short.
- As the topic of a thread changes remember to change the subject header.
- Good manners are required at all time. No personal attacks or "flames."
- Complete your Yahoo profile.
- Before posting a question, search the message archives and the various
resources on the homepage.




Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/