20D - improved Katz Eye focsuing screen - Part 1/1

Started Aug 13, 2005 | Discussions thread
OP Doug Kerr Forum Pro • Posts: 20,898
Testing at smaller aprtures

Hi, Misha,

misha wrote:

Doug Kerr wrote:
I thought the performance (darkening) of the split prism depended
on the widest aperture of the lens at the given focal length - in
this case it should always be 1.4 - or did you somehow set the
camera to simulate the perfmance of a slower lens?

Yes I just set the smaller aperture (in Av mode) and pushed the depth of field preview button.

Of course in use, it is the "viewing" aperture (the largest available) that is of interest.

Best regards,

Doug

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Leica V-Lux 4
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