I am new to deeper imaging and like many am using itelescope as a learning tool. Live in LA and trips out to dark area are not frequent. So great way to fill in between. While I make decisions on what nicer rig to build myself.
I am curious as what causes these circular patterns in images. They are taken care of by stacking but id like to know what they are.
Are they light reflections within the optics?
Are they very small water droplets on mirrors causing a distortion?
I have seen this in many images on this particular setup. Stays static filter to filter.
its T72 in Chile. PlaneWave Instruments CDK 20" f/6.8
Left single image, Right stacked
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For clarity marked the circular distortions I am referencing
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Dust donuts, e.g. the images haven't be flattened and those are the out-of-focus shadows of dust grains somewhere in the optical path.
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Ah... thank you. yes its using flats/dark they have on file, not shot unique for that shot. Good learning. Should always have long enough session to also shoot flats and darks.
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That’s what I like about this site. People give nice answers to simple questions instead of commenting..
”you should get *whatever* book and read it”
or
”i learned the hard way so you should too!”
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Yea I know I'm supposed to do it each time... Was trying to squeeze in other things, took a gamble but didn't realize how big a difference flats in position are.
Have to push to see were things fail. I learn better by jumping in and just doing it. Sure can study study study study first, but you have to DO IT at some point. So why not jump in and study while you are doing. I learn much more from failures than success anyway. Fail forward as they say.
If I do something and it just works. great but I didnt learn why it worked. If I have to fix something I know understand why it failed and how to do it different the next time. And keep repeating as nobody ever knows all.
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now ot figure out how to do flats on itelescope.
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Dust in the optical path very close to the sensor. Probably on the sensor itself.
Dust away from the focus plane is defocued and causes bigger donuts.
I wipe them off the sensor with a very slight touch of an unused cloth made for cleaning eyeglasses.
You need to be careful not to leave more dust than you remove. These at almost invisible specks.
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Erlend Langsrud:
Dust in the optical path very close to the sensor. Probably on the sensor itself.
Dust away from the focus plane is defocued and causes bigger donuts.
I wipe them off the sensor with a very slight touch of an unused cloth made for cleaning eyeglasses.
You need to be careful not to leave more dust than you remove. These at almost invisible specks.
It's a remote telscope...
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andrea tasselli:
Erlend Langsrud:
Dust in the optical path very close to the sensor. Probably on the sensor itself.
Dust away from the focus plane is defocued and causes bigger donuts.
I wipe them off the sensor with a very slight touch of an unused cloth made for cleaning eyeglasses.
You need to be careful not to leave more dust than you remove. These at almost invisible specks.
It's a remote telscope...
He’s gonna need longer arms…
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