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Re: [OM] Multi-coating (contrast)

Subject: Re: [OM] Multi-coating (contrast)
From: w shumaker <rlist@xxxxxxxx>
Date: Thu, 01 Aug 2002 17:23:53 -0400
Speaking of light bouncing around in the lens. Take a look at the back
of a lens when it is stopped down to f/16. Doesn't it seem that the
aperture blades reflect quite a bit of light? At least compared to the
flat black metal of the lens. Also, consider that the film is 18%
reflecting, wouldn't this cause similar, if not more, loss of contrast
than the single versus multi coating? I have noted that in Gary's lens
tests that sometimes the contrast is down a bit at wide open and at
f/16 and f/22. Is the lower contrast at high f stops caused by
diffraction or the reflecting aperture blades and film/first curtain?

Wayne


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