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Troubles with flats Moravian Users · Firas Haki · ... · 3 · 70 · 1

SilverLynx 0.00
Firas Haki
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Hello,
I am wondering how you guys go round taking flats that works for you.
Since I have switched to Newtonian telescope (TS-8 ONTC f/5), flats aren't calibrating out  the dust, and has a minimal effect on flattening out the image.
I aim with SGP to reach 30K or 35k ADU with my Moravian G2-8300, using ledpanel covered with white cloth and placed on the telescope front. Telescope in zenith position.  Histogram then reaches a little over half, which worked before with a refractor. Is it essential to reach on third of the Histogram? Could that be the issue?
Any ideas?
I really don't want to through away 40 hours of material   QUOTEQUOTE SELECTEDEDIT
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Jkulin 0.00
John Kulin
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Everyone gets problems with flats, so don't let that worry you.

I always do mine at 30K ADU and never more, ignore the histogram

Make sure you camera/optical train has not moved a single pixel from when you took your images.

I take my flats before the evening starts and then if I have moved the optical train I redo them again.

I use a G2-8300 MkII with a Moravian MkII x7 2" FW.

I had a problem where I used unmounted filters and because I didn't want to pinch them I only slightly locked them and they were moving in the holder, I nipped them up a little more and all is good now.

Hope that helps?
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Albert_van_Duin 0.00
Albert van Duin
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Hi Firas,

Flats are always difficult, it's a bit of Black Magic! ;)
Make sure the exposure time is not too short, go for 10 seconds. The panel has to be dimmed quite a bit to reach that.

Regards,
Albert
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Surround 0.00
Arnstein Dale
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If you use SGP, there`  s a guide there for setting up how to take flats with different filters.
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