M27 Unguided long exposures (Flemming Kristensen)

Celestial hemisphere: Northern · Constellation: Vulpecula (Vul) · Contains: Dumbbell Nebula · HD189733 · HD345445 · HD345446 · HD345447 · HD345448 · HD345449 · HD345450 · HD345451 · HD345452 · HD345453 · HD345454 · HD345455 · HD345456 · HD345457 · HD345458 · HD345461 · HD345463 · HD345465 · HD345466 · HD345470 · HD345471 · M 27 · NGC 6853 · PK060-03.1

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M27 Unguided long exposures

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M27 Unguided long exposures

With a distance from the TSFLAT2 to the sensor of 130mm I think I have reached the end of my backfocus experiments. I am not really sure if there has been any improvement once I passed 100mm extension - too many other variables involved - and the coma is not completely gone, but the TSFLAT2 definitely increases sharpness towards the edges of the field. I turned on PEC in the mount for this attempt and took at chance at longer exposures, and even though the stars are not exactly round, I am still pretty pleased with the result.

Planetary Nebulae
ZWO ASI 2600MC PRO
The OSC Club (One Shot Camera)
Schmidt-Cassegrain Telescope (SCT) Imagers
Astrophotographers Denmark
IOptron CEM

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Status	Advanced success
Started	...
Astrometry.net job	4778224
PixInsight job	CG6C3BIK9LY5Y2XLV3FFKLROEDHA7CXU
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	19h59m36s.22
RA (top/left)	20h00m48s.86
RA (top/right)	19h58m21s.15
RA (bottom/right)	19h58m23s.87
RA (bottom/left)	20h00m51s.80

Dec (center)	+22°43′12″.8
Dec (top/left)	+22°55′02″.5
Dec (top/right)	+22°54′10″.4
Dec (bottom/right)	+22°31′22″.0
Dec (bottom/left)	+22°32′13″.1

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M27 Unguided long exposures

M27 Unguided long exposures

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