Reducer Flat Field Full frame (Ben Loftin)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: HD215806 · HD215835 · HD215907 · HD240068 · LBN 511 · NGC 7380 · PK107-00.1 · Sh2-142

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Reducer Flat Field Full frame

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Reducer Flat Field Full frame

Wizard Nebula full frame, just applied flat for calibration to see how the corners still have some curvature

It took me a bit to understand the reducer. Folks online/supplier seemed to thin 85 mm was the magic distance. However in testing I have been slowly moving it closer to much improved flat field. It is not perfect yet but will link/upload a full frame that just has had flats applied. I do have some darkening at edges due to 1.25" filters.

1) So at native 2032 FL the field was perfectly flat, so was troubleshooting to make sure it was not camera tilt

2) At 85 mm curvature was quite bad, I have been moving the reducer closer in to the telescope but looking at this image I have a bit to improve on still. I tend to crop what is left out anyway since the filters darken the edges and the bottom right has the OAG prism just peaking its head in a little on that side.

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Status	Advanced success
Started	...
PixInsight job	JJGK9KBB85QFHRXSNDHL4NNLPUVMZR39
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	22h47m17s.53
RA (top/left)	22h49m44s.00
RA (top/right)	22h48m55s.20
RA (bottom/right)	22h44m48s.64
RA (bottom/left)	22h45m42s.19

Dec (center)	+58°08′31″.9
Dec (top/left)	+57°47′03″.9
Dec (top/right)	+58°34′24″.9
Dec (bottom/right)	+58°29′47″.3
Dec (bottom/left)	+57°42′34″.3

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