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Re: [OM] Sharp vs contrast was Cheap, sharp Tamron 500/8 mirror in UK

Subject: Re: [OM] Sharp vs contrast was Cheap, sharp Tamron 500/8 mirror in UK
From: Wayne Harridge <wayneharridge@xxxxxxxxxxxxxxx>
Date: Wed, 20 Aug 2003 08:42:44 +1000



> Johan Malmström <johan.malmstrom@xxxxxxxxxxxxxxxxxx> wrote:
> 
> 
> So my question is: How could a lens yield sharp pictures with low
> contrast?
> 

It all depends on the shape of the MTF curve.  At a given cycles/mm one lens 
will 
have higher contrast than another, at a different cycles/mm that situation 
might be 
reversed.  Just stating lens A has higher contrast than B but less resolution 
is 
meaningless.  There is no measurement for "sharpness", it seems to be a 
qualitative assessment based on contrast and resolution.

Wayne Harridge

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