Re: [APML] Focusing the Mamiya and getting diff results

["Phillip Jones" <starfest@comcast.net>]

Thanks for your response, Wei-Hao. Yes, I followed the instructions on this
website:

http://www.buytelescopes.com/container.asp?dest=/manufacturers/takahashi/fm60inst.htm

and placed the fuzzy side down over a black dot and focused it before
experimenting.

How do you use the FM60 to focus with your Mamiya?

-Phil

----- Original Message ----- 
From: "Wei-Hao Wang" <wang@IfA.Hawaii.Edu>
To: <astro-photo@seds.org>
Sent: Thursday, May 13, 2004 10:12 PM
Subject: Re: [APML] Focusing the Mamiya and getting diff results


> Hi Phillip,
>
> I'm a Mamiya 645 and FM60 user.  My model is Mamiya 645 Super (identical
to
> the current 645 Pro TL) and might be different from your M645.  My asnwer
> below assumes that my 645 is the same as yours.
>
> Your method (2) should be avoid, definitely.  In order for FM60 to work,
> FM60 has to be first focused on the fuzzy side of the focusing screen
> (or the ground glass that comes with FM60).  You can adjust the front end
> of FM60 to do this.  However, the focusing screen of Mamiya 645 is so
thick
> that FM60 can never be focused on its fuzzy side.  If you use this method
to
> focus, the image plane will fall behind film plane and thus will be out of
> focus.
>
> Method (1) and (3) should give you similar results.  The only difference
> is that method (3) only has 2x magnification is is not that accurate
> comparing to (1).  Again, make sure that you focus FM60 on the fuzzy side
> of the ground glass first.
>
> Hope this helps.
>
> Wei-Hao


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