Re: [APML] June pictures ...

[George Anderson <georgea@cam.org>]

Salut Philippe

Visit Howard Edin's page for good details on building a knife edge
focuser.
http://www.howardedin.com/articles/knife-edge.html
Your shots are looking pretty good considering how tough it is to get
critical focus on the Vixen.

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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