andrea tasselli:
Are those calibrated?
DavesView:
Hi Andrea! No, these are the individual subs, auto stretched in PI and saved as jpg. No other treatment.
DavesView:
Hi Andrea! No, these are the individual subs, auto stretched in PI and saved as jpg. No other treatment.
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?
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.
. Vignetting and light leak don't go together, apparently,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,
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.
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!