8 inch f/4 First Light - Guiding Test (NGC7635) (mikefulb)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: Bubble nebula · NGC 7635 · Sh2-162

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8 inch f/4 First Light - Guiding Test (NGC7635)

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8 inch f/4 First Light - Guiding Test (NGC7635)

My first image with this new telescope (TS 8 inch f/5 ONTC) was M27. I took lots of 15 second exposures so I could get a good feel for how well the coma corrector was working. The stars looked reasonable in that shot so I moved on to trying to guide this large scope. I am using a AP Mach1 and it seemed to barely notice the scope was on it! I estimate the weight of the ONTC and guider and camera is around 35 lbs. The guider is a little 50mm finder scope I converted to use an Orion SSAG camera. It rides on the back of the main scope.

For this image I used 90 second exposures at gain=225. I believe I was getting closer to the minimum optimal exposure for my skies and the H-alpha filter.

The image is noisy and I obviously need many more frames for a production shot - this is more of an engineering image and it gave me confidence I can use an external guide scope, which I find MUCH easier than an OAG.

Looks like I can go up to 300s until differential flexure becomes a problem. This should be enough for the ASI1600MM and the fast f/4 speed of this OTA.

Narrowband imaging
Cloudy Nights
ZWO ASI1600MM/QHY163M

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Status	Advanced success
Started	...
Astrometry.net job	1267497
PixInsight job	4OCYDH8UBXST55629WERPZYCNTNS27TU
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	23h20m40s.448
RA (top/left)	23h19m33s.463
RA (top/right)	23h19m15s.140
RA (bottom/right)	23h21m46s.445
RA (bottom/left)	23h22m06s.714

Dec (center)	+61°11′19″.83
Dec (top/left)	+61°24′31″.91
Dec (top/right)	+60°59′48″.95
Dec (bottom/right)	+60°58′05″.76
Dec (bottom/left)	+61°22′47″.37

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8 inch f/4 First Light - Guiding Test (NGC7635)

8 inch f/4 First Light - Guiding Test (NGC7635)

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8 inch f/4 First Light - Guiding Test (NGC7635)

8 inch f/4 First Light - Guiding Test (NGC7635)

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