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[OM] Re: digital/film comparisons

Subject: [OM] Re: digital/film comparisons
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxx>
Date: Thu, 05 Oct 2006 16:56:55 -0400
I hear what you're saying but that's the real world about how 98% of us 
make images today or have them made for us.  If AG's car can go 315 kph 
(snort, snort) but he's only got a 150 kph road, well... he ain't gonna 
go any faster.

Chuck Norcutt

Tim Hughes wrote:

> I always enjoyed some of his careful discussions, but it always bothered me 
> when he is doing his
> comparisons with film, using  a 4000dpi scanner, which of course is another 
> digital camera which
> adds its own optical and digitisation errors,grain aliasing and transfer 
> function to the film. In
> a particular example, we know how difficult it is to get good scans from say 
> kodachrome, where the
> contrast (dynamic range)seems to suffer substantially. It would have been 
> nice if he had been able
> to use something like a scanning microscope photometer for some of the film 
> resolution tests. Also
> given the lenses he used, they may have become quite limiting, making both 
> digital and film look
> similar at the higher resolutions, even if they were not. Once you multiply 
> the MTF's together the
> lens has to have a lot higher MTF to be able to see any meaningful 
> differences in the rest of the
> system. It always seemed like in particular, low speed B&W films would really 
> have been short
> changed in his tests.  
> 
> Tim Hughes
> 
> --- "C.H.Ling" <chling@xxxxxxxxxxxxx> wrote:
> 
> 
>>I think some of you might have seen this:
>>
>>http://clarkvision.com/imagedetail/film.vs.digital.summary1.html
>>
>>Details here:
>>
>>http://www.clarkvision.com/imagedetail/film.vs.6mpxl.digital.html
>>
>>Clark's conclusion is Velvia film is equal to 15MP DC in resolution. 3MP is 
>>really hard to believe!
>>
>>C.H.Ling 
>>
>>
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