NGC 3718 (llolson1)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: NGC 3718 · NGC 3729

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NGC 3718

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NGC 3718

NGC 3718 in LRGB

I took @JulianR 's advice and removed stars during processing. Worked great. The image was taken over a couple of nights.

I used a new PrimaLuce Lab 2" focuser. My previous Celestron focuser used to adjust the mirror directly would not work at cold temperatures (<0F), the mirror would be too difficult for the focuser to move. The new focuser worked great - temperatures were around 0F. I had found that there was some discussion about getting the back focus right by using this type of focus. I found that the focus changed by 1-2mm during the night. So the back focus could be a concern. The other option would be to readjust the main mirror sometime during the night to get back to the 146mm back focus required. I think staying within +/- 1mm would be really good and in this case maybe it is more like +/- 2mm. I initially adjusted the mirror as recommended by PrimaLuce Lab - set the back focus distance to 146mm and then adjust the main mirror to get good focus.

Central USA

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The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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Status	Basic success
Started	...
Astrometry.net job	7413573
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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NGC 3718

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