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

Started Aug 13, 2005 | Discussions thread
OP Doug Kerr Forum Pro • Posts: 20,898
Shift of split-prism focus at small aperture

Hi, P,

PN wrote:

But here is the surprise: While the split prism reacts consistently
until up to F5,6, it will shift beyond that, i.e. using it at F8
would result in front focus!

Interesting. I have not really done any testing with regard to such a phenomenon. I'll try and do some such. It will have ti be after the weekend, as we will be out of town at Carlaqs;' graddaughter's wedding (a two-camera shoot).

It will take a bit of setup. I am not a believer in "agricultural" focus accuracy tests!

I'll have to give some thought as to which might be the "theoretical" basis foir such a phenomenon, if it really occurs.

Best regards,

Doug

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Leica V-Lux 4
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