Taken the same night as the Orion Portrait, but with a different lens a canon 50mm 1.8 set at f/2.8. This lens produced smaller star spot sizes than the tamron 17-50, but with a bit more chromatic aberration at least at f/2.8. The tamron exhibits both coma and severe astigmatism especially near the corners, hence the bird like shape of the stars near the edge of the Orion image, the canon at f/2.8 has coma too but much less astigmatism.The canon 50mm is harder to focus accurately, but is a great bargain of a lens cheap and very light.Few lenses will beat it at f/4, but at much higher prices. Only 32 light frames were captured before the clouds rolled in.
Image Data
Optics: Canon EF 50mm f/1.8 set at f/2.8
Camera: Canon EOS X5 DSLR (unmodified)
Mount: Fixed Tripod
Mount: Fixed Tripod
Exposure: 32 X 4sec at ISO 1600 RAW
Calibration: Darks, Flats,and Bias in DeepSkyStacker by Luc Coiffier
Processing: Gradient removal in Iris by Christian Buil, levels, curves, color in PS
Location: Quezon City, Philippines
Date Time: February 10, 2012. 8:33pm PHT
Conditions: 27C, 70RH, mostly cloudy
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