M81 M82 Very Wide Field - Deep Sky West (Deep Sky West (Lloyd))

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: Bode's nebulae · IC 2574 · M 81 · M 82 · NGC 3031 · NGC 3034 · The star 22UMa · The star 24UMa · The star 27UMa

M81 M82 Very Wide Field - Deep Sky West, Deep Sky West (Lloyd)

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M81 M82 Very Wide Field - Deep Sky West

Link: http://www.deepskywest.com

Link to TIFF/FITS: http://www.deepskywest.com

Difficult, but interesting area with substantial IFN and background galaxies. There's a a trade-off between noise and IFN enhancement. I lean towards less noise although there is probably more to see. I wonder how often we process subtle details into oblivion though? I'm likely more guilty than not...

I'll add a little on the performance of the Rokinon 135mm f/2 + QSI for anyone considering it for AP. I have limited experience with camera lenses for AP, but have used Nikon fixed (35, 50, 85, 105) and telephoto (constant aperture 24-70, 70-200). None of the Nikons perform as well as the Rokinon in my opinion. They suffer from off-axis aberrations and convergence of all wavelengths (think non-APO). I am not bashing Nikon! I'm the owner of a ton of Nikon gear for terrestrial photography, but for AP, the Rokinon exceeds my expectations. You can run it at f/2, but I choose to run at f/2.8 (I've grown used to the need to stop down lenses for optimum performance so it's kinda automatic for me).

For the image above all subs are 5 minutes and unguided. This rig (PME, PEC, Protrack) is capable of 10-minute subs without trailing at FLs > 2,000mm), but for LRGB I've seen no advantage to longer exposures for this camera/lens combination. For Ha, 10-minutes works fine. I can't speak to the other popular NB filters.

Fyi,

-Lloyd

Original
Final
B

Cloudy Nights

Rokinon

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M81 M82 Very Wide Field - Deep Sky West

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