Please help – first light disaster (Detlef Scholz)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: NGC 2841

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Please help – first light disaster

Revision title: Problem Solved

Powered byPixInsight

Please help – first light disaster

Revision title: Problem Solved

This is the result of the First Light session with my new RC12
On the Original you see the picture without flats applied
Rev. B is the same picture with flats applied
Rev. C Is the master flat and its curve to create the flats I use a flat panel. I use this for a long time without problems with my APO’s(monochrome and OSC)

The Flat is created from 15 subs with about ADU 32.000. For the Subs I used the APT Flat tool but tried also a few different exposure times without any noticeable change. The RC is a from TS Modified RC “astrograph” TSRC12T64 with a 0.8 reducer, suitable for full size sensors. Since this is my first experience with RC Telescopes I don’t know if the Vignetting in the first place is OK / normal. I expected this to be corrected by the Flats but the vignetting on the flats seems to be less than those on the lights.
Does any of you has a solution to this Problem or knows what could be the cause?

Original
B
C
Final
D

B

Title: With Flats

Uploaded: ...

C

Title: master flat

Uploaded: ...

D

Title: Problem Solved

Description: Thanks again to all who helped. I Could solve the Problem by generating new Darks. I think i have to replace them more frequently from now on :-)

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	5490943
PixInsight job	YPJ00IPLLYTXGMF710P1EDDC8DM906YD
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	09h22m01s.332
RA (top/left)	09h24m05s.808
RA (top/right)	09h19m49s.300
RA (bottom/right)	09h19m57s.851
RA (bottom/left)	09h24m12s.646

Dec (center)	+50°58′39″.10
Dec (top/left)	+51°10′59″.99
Dec (top/right)	+51°08′47″.89
Dec (bottom/right)	+50°46′09″.66
Dec (bottom/left)	+50°48′20″.57

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Please help – first light disaster

Revision title: Problem Solved

Please help – first light disaster

Revision title: Problem Solved

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Please help – first light disaster

Revision title: Problem Solved

Please help – first light disaster

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