Re: [APML] June pictures ...

[George Anderson <georgea@cam.org>]

Salut encore Philippe

You might want to change the design of your pressure arm. You would want
the pressure on the top and bottom rails. By applying pressure to the
center you are possibly bowing the film plate and and moving the film
closer to the lens.

George Anderson
Montreal Canada

Clear skies and good health

Philippe Chretien wrote:
> 
> Hello,
> 
> The month of June has been a good month for the weather up here. You can see my latest pictures there:
> http://www.astrophoto.ca/en/new.html
> 
> It seems that my guiding improves a bit but I still have big problems focusing my F4! The Hartmann mask is not precise enough so I
> decided to try knife-edge focusing. I bought an extra OM-1 camera body and made a knife-edge focuser following advices from Jerry
> Lodriguss and Rockett Crawford web sites. You can see the first prototype here: http://www.astrophoto.ca/en/focuser.html
> 
> My first attempt using it has not been successful because the filmstrip I used was not flat. I should have seen it before but didn'
> t. Do any of you have a suggestion on a replacement for film as the knife-edge? All advices on knife-edge focussing are very
> welcome!
> 
> Thanks and clear skies,
> 
> P.
> 
> Philippe Chretien
> http://www.astrophoto.ca
> 
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