How to use Katz Eye - MF Focus Technique

Joined
May 23, 2006
Messages
633
Hello everyone,

I am sure many of you have used a manual focus screen or Katz Eye. That said, I am hoping some of you can share how the split prism works. From what I can tell so far, the prism in the middle will align when in focus, there is also a circle that is around this prism that looks almost like a bunch of smaller prisms. Could someone please explain the purpose of this screen?

Also, when you are not dealing with an image that has any identifiable straight lines, what is the best way to tell if you are in focus or not?

Thanks,

Dave
 
Joined
Oct 20, 2005
Messages
576
Location
Central TX
The circle of smaller prisms will appear sparkly (for lack of a better word) when out of focus and nearly transparent when focussed. Better than the split-prism for targets that don't have straight lines. Try it with a fast lens until you learn what you're looking for.
 
Joined
May 23, 2006
Messages
633
The circle of smaller prisms will appear sparkly (for lack of a better word) when out of focus and nearly transparent when focussed. Better than the split-prism for targets that don't have straight lines. Try it with a fast lens until you learn what you're looking for.
Just tried with my new Zeiss 35/2. All I can say is wow. Talk about smooth focussing on that thing.
 
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