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

[Duncan Munro <dmunro@sfu.ca>]

If I can jump in here, I have a Nikon F2 and the Nikon 6x magnifier that 
replaces the prism. For best result,s to focus directly on the focus 
screen, you will have to have one that has a cross hair etched onto it. 
I use a photomicrophotography screen with a cross hair etched on it. You 
focus the magnifiers diopter adjustment onto the crosshair and only then 
can you get good focus with the magnifier on a star or planet. If you 
don't focus on a  crosshair your eyes will attempt to accomodate the 
focus and the exact focus position will be hard to determine.

cheers

Duncan

Stuart Heggie wrote:

>Yes - the wisdom of John Mirtle is not to be discounted! John, do you think it will work to focus
>directly on the focus screen with the viewfinder removed from my Nikon F2?
>
>Stuart
>----- Original Message -----
>From: "Alan Voetsch" <alanv12952@yahoo.com>
>To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
>Sent: Friday, November 12, 2004 11:21 PM
>Subject: [APML] Focusing OM-1 (Was:Film Images)
>
>
>  
>
>>Stuart,
>>
>>I thought it might be beneficial for me to jump in here and pass on the
>>same advice to you that John Mirtle gave to me last year. He
>>recommended the Lumicon 6X Critical focus scope. I think it still sells
>>for about $20. Easy to use and because I use it with my Taurus, the
>>focus is easily repeatable and only needed to be done once. Your
>>mileage may vary, but it is an inexpensive option.
>>
>>Alan
>>
>>--- Stuart Heggie <stuart.j.heggie@sympatico.ca> wrote:
>>    
>>
>>>Thanks Joe! I might have to take the plunge. I've focused mine using
>>>a Hartmann mask but my longest
>>>lens is very temp dependent.
>>>Stuart
>>>----- Original Message -----
>>>From: "joe" <jmize@svic.net>
>>>To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
>>>Sent: Friday, November 12, 2004 9:23 AM
>>>Subject: Re: [APML] Film Images
>>>
>>>
>>>      
>>>
>>>>Thkx Stu;
>>>>
>>>>     I bought a Heutech Mitsuboshi Knife Edge focuser for my OM-1.
>>>>        
>>>>
>>>Great
>>>      
>>>
>>>>device, easy to use.  Actually you should see the test shots I did
>>>>        
>>>>
>>>last week
>>>      
>>>
>>>>in dry air.  Now those really showed tight stars...joe  :)
>>>>        
>>>>
>>
>>=====
>>SCT Astrophotography: http://www.pbase.com/avoetsch/astrophotography
>>FS-102 G-11/Gemini: http://www.pbase.com/avoetsch12952/tak_fs102
>>& http://www.pbase.com/avoetsch12952/fs102
>>
>>
>>
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>>
>
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