astro: m51

10x900 seconds
Celestron 80mm f5
Vixen Sphinx SXD Mount
Sbig ST2000XCM
testing the guide scope for a new project, this old 80mm surprises me
every time I use it

--
John N. Gretchen III
N5JNG NCS304
http://www.tisd.net/~jng3

John N. Gretchen III wrote:
10x900 seconds
Celestron 80mm f5
Vixen Sphinx SXD Mount
Sbig ST2000XCM
testing the guide scope for a new project, this old 80mm surprises me
every time I use it


------------------------------------------------------------------------

Nice big FOV. I had to hunt down M51. At Hyde, where we fight the city
lights you can't see it in the finder but the triangle of bright stars
up and to the left in your photo make a good marker I can see in the
finder. Nice to see them in the picture. It does have good stars to
the edge of that CCD.

Back in film days I used an f/6.4 400mm lens. Same focal length as your
scope but only 63.5 mm aperture. Can an Exacta lens be attached to a
CCD? I still have it. Cost me $35 used at a camera store in NYC back
in the early 60's.

Rick


--
Correct domain name is arvig and it is net not com. Prefix is correct.
Third character is a zero rather than a capital "Oh".

"John N. Gretchen III" wrote
...
10x900 seconds
Celestron 80mm f5
Vixen Sphinx SXD Mount
Sbig ST2000XCM
testing the guide scope for a new project, this old 80mm surprises me
every time I use it


Great image John! It's amazing what a little 80mm will do! They make nice
wide-field image systems.

George N