From: John Murray 
To: Jon Bishop , Amateur Telescope Makers
        
Reply-To: John Murray 


G'day John,
    I use a JVC digital camera with auto focus, auto exposure to take my
foucault and ronchi pics. There's no black art to it. Just have the camera
supported in one spot so it doesn't move and then adjust the tester to feed
the return beam into the lens. See my page on ronchigrams in my sig to see
the results..

Cheers

John Murray
Whyalla
South Australia
Check our web page at http://astronomy.sa86net.com ATM and M-O-M stuff.
Latest Ronchigrams only at http://www.users.bigpond.com/imasloth/


-----Original Message-----
From: owner-atm{at}shore.net [mailto:owner-atm{at}shore.net]On Behalf Of Jon
Bishop
Sent: Friday, 15 August 2003 9:11 AM To: ATM
Subject: ATM Foucaul pictures using digital camera.


Hi,
I am in the process of polishing and figuring an 8" F5.25 mirror. I
would like some advice on figuring it, but before I do that it would be
nice to take some pictures of the mirror under test. I have a Canon A40
digital camera, but when I try to use it it does not pick up the mirror
disk. Has anyone suceeded in using an autofocus digital camera to do this?
Thanks,
Jon Bishop

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