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Contains:  M 31, Great Nebula in Andromeda, NGC 224, M 32, NGC 221, M 110, NGC 205, The star νAnd, The star 32And
Getting plate-solving status, please wait...
M31 with old Sigma 80-200 film zoom, 


            Tom Robbe
M31 with old Sigma 80-200 film zoom

M31 with old Sigma 80-200 film zoom

Technical card

Resolution: 2072x1259

Dates:Nov. 29, 2015

Frames: 69x43" ISO1600

Integration: 0.8 hours

Darks: ~31

Flats: ~21

Bias: ~21

Avg. Moon age: 18.54 days

Avg. Moon phase: 84.73%

Bortle Dark-Sky Scale: 4.00

Mean SQM: 20.15

Temperature: 2.22 job: 868447

RA center: 10.632 degrees

DEC center: 41.310 degrees

Pixel scale: 10.051 arcsec/pixel

Orientation: 91.956 degrees

Field radius: 3.385 degrees

Locations: Home, Sebastopol, CA, United States


I'm continuing to experiment with this old zoom lens; Sigma 80-200 f/3.5-4 for a Nikon film camera. Its proving to be sharp in the center, but suffers serious coma on the edges even stopped down to f5.6. I almost did not post this, because I'm a bit disappointed right now with this lens and this image. But upon looking at it again, I don't think its all that bad, especially if one ignores the edges which I cropped somewhat, but wanted the effect of M31 isolated in a wider field of stars than is usually presented. Unfortunately, I did not have the galaxy centered well, so the coma shows more on the bottom right corner. Oh well...
Thanks for looking!



Tom Robbe
License: None (All rights reserved)

Sky plot

Sky plot


M31 with old Sigma 80-200 film zoom, 


            Tom Robbe