A little help figuring out what is wrong. The equipment is: WO FLT91, 68III 1x flattener, Optolong 2" LRGB filters, ASI6200MM-P. The optic extenders are M54 to the rotator and the rotator is M54 to the filter wheel. The filter wheel is screwed directly to the camera and the camera tilt unit is removed. Shot at full frame. Auto stretched and saved as jpg at 20 percent. I see the dust artifact in the UV-IR. Missed it at assembly. UV-IR  Red  Green  Blue  |
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andrea tasselli:
Are those calibrated? Hi Andrea! No, these are the individual subs, auto stretched in PI and saved as jpg. No other treatment.
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DavesView:
Hi Andrea! No, these are the individual subs, auto stretched in PI and saved as jpg. No other treatment. Why wouldn't you calibrate them before posting this?
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DavesView:
Hi Andrea! No, these are the individual subs, auto stretched in PI and saved as jpg. No other treatment. *Well, just to be sure. Yes, there is a bit of vignetting but not dramatic. But you appear to also have other issues. Whether they are there needs to come up with the calibrated frames.
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OK! So maybe my question should be: Are the ring effects in the above uncalibrated frames normal for full frame on a 44mm image circle?
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I would say they're not typical, but also not unusual. Especially if they calibrate out with flats. Do the flats show the same rings?
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Gleb Polyakov:
I would say they're not typical, but also not unusual. Especially if they calibrate out with flats. Do the flats show the same rings? Yes, the flats show the same rings and waiting on WBPP to find out if they fix it.
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andrea tasselli:
DavesView:
Hi Andrea! No, these are the individual subs, auto stretched in PI and saved as jpg. No other treatment.
*Well, just to be sure. Yes, there is a bit of vignetting but not dramatic. But you appear to also have other issues. Whether they are there needs to come up with the calibrated frames. Andrea, You mentioned other issues. Is it possible I have a light leak? Here are the same subs calibrated: UVIR  Red  Green  Blue  |
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That is exactly was I was hinting at, just didn't want to jinx it  . Vignetting and light leak don't go together, apparently,
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andrea tasselli:
That is exactly was I was hinting at, just didn't want to jinx it . Vignetting and light leak don't go together, apparently, Thanks! I thought so. Can't wait to dig into that issue.
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Could it be light reflections inside the image train?
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I have the 6200MM and WO FLT120. Same image circle as you.
When uncalibrated, same effect as your, that is normal.
The remaining vignetting post calibration is light leak as stated before. You should see how much tape and sheet of aluminum I have on my telescope to resolve this in a bortle 9…. Small leaks around the filterwheel, the OAG, etc…
Now if I take a dark frame, I get the same ADU in a dark room as when it's under the sun outside in the middle of the afternoon. That is the ideal scenario. My flats now perfectly calibrate, even in the corners of the full-frame sensor.
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Miguel T.:
I have the 6200MM and WO FLT120. Same image circle as you.
When uncalibrated, same effect as your, that is normal.
The remaining vignetting post calibration is light leak as stated before. You should see how much tape and sheet of aluminum I have on my telescope to resolve this in a bortle 9.... Small leaks around the filterwheel, the OAG, etc...
Now if I take a dark frame, I get the same ADU in a dark room as when it's under the sun outside in the middle of the afternoon. That is the ideal scenario. My flats now perfectly calibrate, even in the corners of the full-frame sensor. Thanks Miguel! I'm in B7 skies, so plenty of LP. I just cut the toes out of a pair of thick, dark black socks to slip over the focuser (as seen on Astrobin). That covers it all the way to the rotator. Going to try that first to search for the culprit. So dark frame in very low light and then blast it with light for another dark frame. The aim is to achieve the same ADU in both conditions. I like it!  |
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DavesView:
Miguel T.:
I have the 6200MM and WO FLT120. Same image circle as you.
When uncalibrated, same effect as your, that is normal.
The remaining vignetting post calibration is light leak as stated before. You should see how much tape and sheet of aluminum I have on my telescope to resolve this in a bortle 9.... Small leaks around the filterwheel, the OAG, etc...
Now if I take a dark frame, I get the same ADU in a dark room as when it's under the sun outside in the middle of the afternoon. That is the ideal scenario. My flats now perfectly calibrate, even in the corners of the full-frame sensor.
Thanks Miguel! I'm in B7 skies, so plenty of LP. I just cut the toes out of a pair of thick, dark black socks to slip over the focuser (as seen on Astrobin). That covers it all the way to the rotator. Going to try that first to search for the culprit. So dark frame in very low light and then blast it with light for another dark frame. The aim is to achieve the same ADU in both conditions. I like it! I did the flashlight first. Found some leaks but gave a false impression that I found them all due to the nature of a directional light. Take it out on your deck during daylight. With the ambient light bouncing in all direction you'll find all the leaks. There's more than we think in a system that appear sealed.
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