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[OM] Re: Focusing screens, was: Re: Homepage picture update

Subject: [OM] Re: Focusing screens, was: Re: Homepage picture update
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxx>
Date: Fri, 13 Jan 2006 21:06:42 -0500
I remember reading it now.  As a Celestron owner I don't generally 
forget mention of the marque.  Thanks for refreshing my failing memory.

Chuck Norcutt

Walt Wayman wrote:

> I will quote myself from back in August when I got my Katz Eye screen for the 
> E-1.  Nothing's changed.  My initial impression and observations remain the 
> same.  The Katz Eye screen is why the 500/8 Zuiko is in my E-1 kit bag.  Back 
> then, I said:
> 
> "The Katz Eye split prism focusing screen for the E-1 has arrived and is now 
> installed.
> 
> "For starters, those who have expressed some concern about the installation 
> process, fear not.  It's just the same as changing screens in the OMs, so if 
> you're competent enough to do that, you can make the swap in less than a 
> minute.  
> It helps to have the tweezers that come with the OM screens, since the tab on 
> the E-1 screen is just about the same size.  The only real difference in the 
> procedure is just that everything's half OM size.  Think small.
> 
> "Now, down to the nitty-gritty.  My screen is the new "Plus" version, about 
> which 
> Katz Eye claims that the split prism won't black out when the lens is stopped 
> down beyond f/5.6.  I have only three lenses that slow at maximum aperture: 
> 400/6.3 and 500/8 Zuikos and a 1250/10 Celestron.  The first lens I tried, 
> and 
> the one I was most interested in seeing if it could be used without 
> black-out, 
> was the 500/8.  No -- I repeat -- no blackout whatsoever, even in deep shade, 
> making focusing of this lens more precise and easy than with a plain matte 
> screen.
> 
> "Next, to see how far up (or is it down?) the f-stop scale I had to go to get 
> black-out, I mounted the 180/2.8 Zuiko.  Guess what?  With careful eye 
> positioning, there's not even black-out at f/32!  Of course, beyond f/11 or 
> f/16, the split prism isn't all that useful because of the increased depth of 
> field, but at least there's not the big, constantly shifting, half a black 
> hole 
> in the middle of the viewfinder when shooting stopped down."
> 
> Walt, that's my story, and I'm sticking to it



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