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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
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M31 The Andromeda Galaxy with 135mm lens, 


            Michael Feigenbaum
M31 The Andromeda Galaxy with 135mm lens

M31 The Andromeda Galaxy with 135mm lens

Technical card

Resolution: 5108x3176

Dates:June 30, 2019

Frames:Baader UV/IR-Cut/L Filter: 275x60" (gain: 111.00) -5C

Integration: 4.6 hours

Darks: ~50

Flats: ~60

Avg. Moon age: 27.04 days

Avg. Moon phase: 6.83%

Bortle Dark-Sky Scale: 4.00 job: 2773573

RA center: 10.644 degrees

DEC center: 41.310 degrees

Pixel scale: 3.654 arcsec/pixel

Orientation: 238.624 degrees

Field radius: 3.052 degrees

Locations: Papago Butte, near Maricopa, AZ, United States

Data source: Backyard


I always have wanted to do an M31... I think all novice imagers have this high on their lists along with M42, M45 and the Moon. I've tried it a couple of times and was never able to come up with something even approaching mediocrity, lol...

I had some success with this very economical Oshiro 135mm lens and thought why not try M31 with it? So here is the result. In this image some of the flaws of the lens become apparent, mostly in the CA area where the blue channel is not in focus along with the R &G.

I wanted to do this with a 2x drizzle to combat the undersampling but the editing in PI was simply too slow. The drizzled image was almost 1gb in size and even with an i7 processer with 16g of ram, it probably is just not enough computing power.

To combat the "blue bloat" I made a synthetic L by combining the R and G channels. I inserted that with LRGB combine and it did wonders. Still not the quality of color that we might be looking for but a significant improvement nonetheless.

But overall, I find the image to be somewhat pleasing and really not horrible considering what it is. I love the FOV of that lens and its speed and there are definitely uses for it.

I've included a cropped version of the image too.

Any comment or criticism always welcome and Clear Skies to all!!




Michael Feigenbaum
License: None (All rights reserved)


  • Final
    M31 The Andromeda Galaxy with 135mm lens, 


            Michael Feigenbaum
  • M31 The Andromeda Galaxy with 135mm lens, 


            Michael Feigenbaum


Cropped version

Sky plot

Sky plot


M31 The Andromeda Galaxy with 135mm lens, 


            Michael Feigenbaum