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| Never worked. |
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andrea tasselli: So last night after a long time i got a clear night Went for two targets the M5 and the Veil Nebula   The M5 is about 1 hour of integration and the Veil nebula is about 2 Hours of integration Both have the same set of correction frames. The only difference is the moon was closer to the M5 as compared with the Veil. Could that be the reason for the green rings in the M5 cluster Image? Other than that the scope is performing extraordinarily well. Amazed with the results. |
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Hi i have the same problem here. I think is a second mirror shadow but it doesn´t fix by flats . I could try in 3 200/1000 pds scopes and it has similar resaults. Indeed the only one it has flocked. it has more significant shadow or ring pattern. The image is resault of taking flats in different scopes and then i run dbe with 10 tolerance, normalized and substraction. I changed the spider with the same resaults... This is the first light i stacked and when i found the problem  |
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| The dark spot in the center looks more like the result of condensation/frost on the sensor. |
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andrea tasselli: Maybe but i did the test whithout cooling and in a room and didn´t see any condensation....any idea? |
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Maybe but i did the test whithout cooling and in a room and didn´t see any condensation....any idea? Condensation could also happen without cooling if the camera is brought inside a warmer place. But the main rule is never take flats inside, at least for open designs such as a newton. Having said that the flats show also significant light leaks so you might want also to address that. Flocking in nearly irrelevant for that but darkening of the secondary side isn't. Also light path from the back end as well as from the focusers are a source of light leaks. Most importantly, try to take flats without direct lighting onto the scope. And use a dew shield. Check with a dark frame of signficant length (in the same conditions you are imaging with) to see whether you are free of those leaks. |
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andrea tasselli:Maybe but i did the test whithout cooling and in a room and didn´t see any condensation....any idea? Hello, I thought that would not happen in flats without cooling...Thanks for the clarification. Yes, the shots you see in the images were taken with the 3d back cover + black cloth on the primary mirror part. The focuser was also covered with black clothes to avoid leak lights, in addition to the fact that the focuser is flocked at the joints with the scope.Maybe i will try with a dlsr? |
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Same shadow with dslr without filters or coma corrector |
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| Anybody who has 200/1000 pds can send me a masterflat from his scope? thanks in advance |
