M81 Bode's and its dance partner :D

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M81 Bode's and its dance partner :D

#1

Post by UlteriorModem »


Got a 2 for 1 with Bodes Galaxy.

Had a little trouble with the data at first but managed to wring some good out of it. I think I need to back off exposure time on the ASI071mc as the frames were swamped with background noise.

Anyhow this is what I got out of it. Pretty happy with the color balance.

19 x 300 sec frames. ASI071mc-p, UV/IR cut filter, through the 120mm APO, around 900mm focal length.

ImageM81 pass 3 by Tom Whit, on Flickr
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Re: M81 Bode's and its dance partner :D

#2

Post by Juno16 »


M81 is beautiful! Great definition!

Thanks,
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Re: M81 Bode's and its dance partner :D

#3

Post by 10538 »


Great image Tom. These are two of my favorites! :text-thankyoublue:
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Re: M81 Bode's and its dance partner :D

#4

Post by Thefatkitty »


That's a really nice M81 & 2 Tom, good for you on the clear skies :D
And not to be critical, but on my end it looks like there's some dim semi-circles scattered throughout. Could be my monitor as well, it's no spring chicken!

All the best,
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Re: M81 Bode's and its dance partner :D

#5

Post by STEVE333 »


Nice closeup view of these two Tom. Don't see the noise in the final image.

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Re: M81 Bode's and its dance partner :D

#6

Post by UlteriorModem »


Thefatkitty wrote: Thu Jan 23, 2020 2:28 am That's a really nice M81 & 2 Tom, good for you on the clear skies :D
And not to be critical, but on my end it looks like there's some dim semi-circles scattered throughout. Could be my monitor as well, it's no spring chicken!

All the best,
No they are there. You should have seen it before processing. I am struggling with my flats working effectively and there are some hellacious dust motes in the system now. Cant seem to chase them down.
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Re: M81 Bode's and its dance partner :D

#7

Post by Baskevo »


UlteriorModem wrote: Thu Jan 23, 2020 2:09 pm
Thefatkitty wrote: Thu Jan 23, 2020 2:28 am That's a really nice M81 & 2 Tom, good for you on the clear skies :D
And not to be critical, but on my end it looks like there's some dim semi-circles scattered throughout. Could be my monitor as well, it's no spring chicken!

All the best,
No they are there. You should have seen it before processing. I am struggling with my flats working effectively and there are some hellacious dust motes in the system now. Cant seem to chase them down.
What program are you using for acquisition? I'm using APT, which has a flats wizard for CCD/CMOS cameras. I set it to 45-50% of the max mean ADU value, and that seems to work pretty well! I believe NINA lets you do it as well. I'd be surprised if SGP didn't have something similar.
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Re: M81 Bode's and its dance partner :D

#8

Post by UlteriorModem »


I dont mean to sound curt, but I know very well on how to acquire and apply flats. I am just struggling finding the right settings for the new camera and with the motes in the imaging chain. I am fairly certain the dust is on the focal reducer as they are quite large and diffuse. The flats look very good it's just that SGP is not fully mitigating the issues.

I am using SGP's flat calibration wizard shooting for around 35,000 adu the O71's full well is 46,000.

Here is a mild example of the issue.

ImageWBPP Results by Tom Whit, on Flickr
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Re: M81 Bode's and its dance partner :D

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Post by Jockinireland »


I think thats a lovely image. Both galaxies seem to glow from within without being blown out. Nicely done.
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Re: M81 Bode's and its dance partner :D

#10

Post by mbocca »


Tom,

I have the ASI1600mm-p, and there are circles like that, or even donuts that I attribute to light reflection in the optical train. The flats will not remove those since the nice even illumination is not enough to generate the reflection.

I am not sure if that's what you are experiencing, but they look similar to the ones I see.

Good luck mitigating them.
Mike
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Re: M81 Bode's and its dance partner :D

#11

Post by UlteriorModem »


Thanks but these are dust motes. They do show up in the flats. However calibration is not fully removing them.

I have experienced internal reflections with a previous filter I had. The new filter seems to have helped with that but introduced new problems. I can post some much more clear examples when I get home from work.
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Re: M81 Bode's and its dance partner :D

#12

Post by jerrysykes »


Hi Tom. Great looking M81 & M82.

With regard to the large circles in your images, I don't have a ZWO camera for deep sky imaging. I use an Atik 383 OSC but if I don't clean the window in front of the sensor before every use I get the same exact circles.

Don't know if you have the same problem as I have but you could have convinced me it was taken with my camera.
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Re: M81 Bode's and its dance partner :D

#13

Post by UlteriorModem »


jerrysykes wrote: Thu Jan 23, 2020 4:46 pm Hi Tom. Great looking M81 & M82.

With regard to the large circles in your images, I don't have a ZWO camera for deep sky imaging. I use an Atik 383 OSC but if I don't clean the window in front of the sensor before every use I get the same exact circles.

Don't know if you have the same problem as I have but you could have convinced me it was taken with my camera.
Thanks, I actually just got through chasing down where the pesky dust or whatever were. I did the rotate the entire imaging chain Field Flattener, filter, camera, and the defect stayed in the same place. Then I tried leaving the FF in place and rotating the camera & filter, still in the same place. Then I took the filter out of the chain and tried again. Still in the same place. That only leaves one surface. The protective glass in front of the sensor, just as you say!

So I took things apart and cleaned the protective window and it was much better. There was still one doughnut near the edge now. A little more cleaning and now it appears to be defect free... knock on wood.

BTW here is a stretched but otherwise unprocessed frame that clearly shows the weird defect. Almost looks like a crater! I was convinced due to it's size it was somewhere else than the protective glass but I was wrong!


ImagePre Proc 1 by Tom Whit, on Flickr

I don't think it was dust as it did not make a doughnut, rather it was some sort of dew drop or some such. But it appears to be all clean now. Wont really know until this weekend when it is allegedly supposed to clear up.

Oh and here is a stretched master flat that shows the circle that would not go away :D

ImageStretched Flat 1 by Tom Whit, on Flickr
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Post by jerrysykes »


Someone (I don't remember who) told me some years back that if the circles were that large the problem was close to the sensor.

I wonder if it's caused by the camera warming up when shut off and causing condensation to form and dry as a water spot. Just a guess.
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Post by UlteriorModem »


No it's the opposite. The smaller tighter the doughnut the closer to the sensor ;)

Here check this out to prove it.

http://www.ccdware.com/resources/dust.cfm

And that might be a very good guess. I have never seen the sensor window fog over though it may have happened at some point.
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Post by jerrysykes »


UlteriorModem wrote: Thu Jan 23, 2020 11:28 pm No it's the opposite. The smaller tighter the doughnut the closer to the sensor ;)

Here check this out to prove it.

http://www.ccdware.com/resources/dust.cfm

And that might be a very good guess. I have never seen the sensor window fog over though it may have happened at some point.
Thanks for this,Tom. Learn something new everyday.

Did you find out how to get the pixel size of the circles?
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#17

Post by UlteriorModem »


jerrysykes wrote: Fri Jan 24, 2020 11:45 am
UlteriorModem wrote: Thu Jan 23, 2020 11:28 pm No it's the opposite. The smaller tighter the doughnut the closer to the sensor ;)

Here check this out to prove it.

http://www.ccdware.com/resources/dust.cfm

And that might be a very good guess. I have never seen the sensor window fog over though it may have happened at some point.
Thanks for this,Tom. Learn something new everyday.

Did you find out how to get the pixel size of the circles?
Not really yet. I asked over at PI forums but havent gotten back to it yet.
Tom

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Re: M81 Bode's and its dance partner :D

#18

Post by SKEtrip »


Good Stuff UM!
Did you use Astrophotography lab to determine exposure time?
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Re: M81 Bode's and its dance partner :D

#19

Post by helicon »


Great stuff Tom!
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Re: M81 Bode's and its dance partner :D

#20

Post by UlteriorModem »


SKEtrip wrote: Fri Jan 24, 2020 3:55 pm Good Stuff UM!
Did you use Astrophotography lab to determine exposure time?
No more like trial and error. 300 seconds seems to be just about the upper limit depending on the sky conditions. At least with the UV/IR filter. The narrow band filter basically doubles it.
Tom

Current Equipment:
Mount: Celestron CGX-L
Scope: 130mm f7 APO
Cam: ASI071mc-pro
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