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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  |
3.31
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| I usually do 40% of the histogram. I keep going back and forth between using an LED tracing pad and sky flats. I used to swear by the tracing pad, but lately, sky flats have been working better for me. |
5.02
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| I use flats with 33000ADU for my 294mc. But you should try with a series with 10% steps around and see which works best. This is not a big effort to take 200 more flats 😉 |
1.81
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| I use a home made light box and aim for around 50% on the historam but I'm not fussy, works well over a wide range of percentages. Not sure what your problem might be, is it something in software settings perhaps? |
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Hello, I use a manufactured flat box and leave APT doing the job with 25K ADU (+/-10%) that correspond around 2/3 histogram. |
11.33
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| This might sound crazy but make sure the settings in your acquisition software are exactly the same for the flats as they were for the lights. I recently had a similar problem and discovered that in N.I.N.A, I had the offsets set differently in the flats wizard. I changed the offset and re-did the flats and all is well. |
1.20
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Hello, Same as Olivier : APT 25K ADU ( UNC 8" / ASI071 color ). Self made flat box . Camera & focus on same "position" on the scope (same angle than during the night) for avoiding new dust on coma corrector (or different position of the same dust when moving ...) , and neutralize reflexions (in case ...) |
