Sh2-236 first light WO81GT IV (John Favalessa)

Sh2-236 first light WO81GT IV

After the rains (and globules 😂), last night was clear although a bit windy. I had to test out my new scope and check the stars (even though struggling as I've had a fever for 2 days; 2 negative covid tests and I'm a 3 shot vac guy). Some of you may know all the trouble and frustration I had with the WO71GT. Many wasted nights. Well the good folks at Willam Optics said to bring it back to Woodland Camera. They found it was out of collimation...odd for a new refractor. Full refund, but then I decided to upgrade to the 81GT IV as it has a rotator and fits in the case without dismantling...more $'s 🤑 of course.

Due to my struggling I forgot to put in the light pollution filter or the dual narrow band filter with the OSC ASI2600MC I was using. Guiding was good. I good 4 good hours. Good thing I could do most things from my bed with the iPad with the ASIAIR. No star reduction at all as the stars where the point of the test. I'm actually kind of pleased with the image as no light pollution filter from Bortle 6+ backyard.

What do you think...are the large stars over exposed? I used 100 gain which greatly diminishes the well.

Bottom line: stars are good in 3 corners and slightly off in the other (have to pixel peak to see). Must need a slight tilt plate adjustment, like 1/8 push turn. I am HAPPY as now I can finally go wide!

The native focal length is 472mm. with the WO 0.8 flattener/reducer 378mm and with the Starizona 0.65, 307mm. I bought the Starizona reducer to test the 71GT, but thinking of selling as was expensive.

Original
Final
B

B

Description: All new data this time with the LeXtreme dual narrowband filter. Could have posted as a new image, but is really part of this first light testing. 42 x 300 sec subs. guiding was poor. I extracted pseudo Ha and Oiii using APP and created this HOO image. I inadvertently rotated the OSC camera, so I couldn't use the RBG stars from last night as planed (I'd have to crop too much), and I lost IC417. This image is only slightly cropped at the edges. I did use star reduction with Adam Block's method. My testing is done; I love the star shape! When the opportunity arrives I'll use my mono camera and really see what this scope can achieve!

Oh, I saw a face in the core and tried to bring it out more.

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	5157691
PixInsight job	F12U5GRR1F33Q2GQ4GXD1VQ5PMTKR4PE
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	05h22m28s.36
RA (top/left)	05h16m13s.48
RA (top/right)	05h17m52s.67
RA (bottom/right)	05h28m29s.57
RA (bottom/left)	05h27m15s.15

Dec (center)	+33°23′56″.7
Dec (top/left)	+34°59′10″.9
Dec (top/right)	+31°35′18″.9
Dec (bottom/right)	+31°47′08″.1
Dec (bottom/left)	+35°11′27″.7

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