Re: [APML] Focusing OM-1 - but what about the Nikon F2?

[Wei-Hao Wang <whwang@gmail.com>]

On Sun, 14 Nov 2004 21:30:17 EST, kgkirkley@aol.com <kgkirkley@aol.com> wrote:
> This applies to astrophotography as well as world affairs.
> A lot of accomplished astrophotograhers started out trying to focus their
> systems using the ground glass image without and with various magnifiers.

Hi Kent,

I guess here you didn't include ground glass plus magnigiers ON FOCAL PLANE.

> Sometimes they were successful, sometimes not, but it's a shame they wasted
> those dark sky times. Eventually they became aware of focal plane focusing
> devices like Ronchi and knife edge focusers. After very little practice they
> found they could always achieve exact focus.
> 
> I did the same thing. I tried several different knife edge devices but once
> I used the Hutech Mitsuboshi   KEF, I haven't looked into the viewfinder
> much.
> 
> Kent Kirkley

-- 
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Wei-Hao Wang  :)

Institute for Astronomy at University of Hawaii

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