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Re: Re: [OM] Lens sharpness

Subject: Re: Re: [OM] Lens sharpness
From: Wayne Harridge <wayneharridge@xxxxxxxxxxxxxxx>
Date: Wed, 31 Oct 2001 14:04:35 +1100



> John Hudson <jahudson@xxxxxxx> wrote:
> 

> Can someone out there please tell me whether "high resolution" and
> "high
> contrast" are one and the same and if not how it might be possible to
> have a "high resolution" and "low contrast" lens or vice versa
> 

Yeah, these things get bandied about willy nilly.  To compare 2 lenses with 
respect to resolution and contrast you need to consult the MTF curves for each 
lens.

If you do this you can determine:

1. For a specified resolution (e.g. 40lp/mm) which lens has the higher contrast.

2. For a specified contrast (e.g. 50%) which lens has the higher resolution.

It makes little sense to say lens A is a high contrast lens while lens B is a 
high 
resolution lens.


Wayne Harridge

http://members.optusnet.com.au/~w_harridge

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