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M31_foto
M31 200mm

Poster: Clear Skies (see all of this user's photos)
Description: M31 captured on 35mm film, Kodak Elite Chrome 200, using my 200mm Pentax Takumar f/3.5 @ f/4 piggyback on my N11 for 30 minutes, manually guided with off-axis guider.


Starman1
Vendor (EyepiecesEtc.com)

Registered: 6/24/2003
Posts: 21723
Very good example of what vignetting looks like. Textbook.
Also, coma at top two corners, but not bottom. Your film holder may not hold film flat on both sides.
Shot shows a lot of stars, though.
Can you digitally process photo, or crop and expand slightly? I think NGC205 would stand out better if you did.
It looks like you could go to 45minutes or an hour with this film before you fog, and that might capture more light.
But digital processing may find more extension in the same shot with a little processing.
Film, huh? You'll be dangerous when you get a CCD.
Keep shooting.
Don Pensack
Thu Mar 10, 2005 8:12pm
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HubbleO
super member

Registered: 7/28/2004
Posts: 122
Don, re: vignetting...is that evident from the drop off in the density of stars toward the outer edges of the shot? Also, I guess I'm not familiar by what you mean be coma (I thought it would be distortion showing itself as the stars not being pinpoint...but I don't see any distortion in the stars). Am I just not looking close enough?
Mon May 23, 2005 10:17am
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erik
telescope surgeon

Registered: 1/30/2004
Posts: 24811
i agree with what don is saying- coma is noticeable towards the edges, and there is some vignetting. still, i think it's a nice image with good detail! Smile
Sun Jul 23, 2006 8:09pm
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