×
INDI Library v1.8.8 Released (09 Jan 2021)

Here are the changes from v1.8.7 to v1.8.8

M 31 - Andomeda Galaxy

2 months 1 week ago
mhammady
Elite Member
Elite Member
Posts: 196
More
Topic Author
M 31 - Andomeda Galaxy #62931


Equipment

Imaging telescope / lens Celestron Schmidt-Cassegrain (SCT) 8"/2032 mm 8SE
Imaging camera ZWO Optical ASI183mm Pro (CMOS)
Mount Equatorial Sky-Watcher HEQ5 Pro
Guiding telescope / lens Celestron Schmidt-Cassegrain (SCT) 8"/2032 mm 8SE
Guiding camera ZWO Optical ASI120MM Mini (mono) (CMOS)
Filters ZWO Optical Luminance (UV/IR block) 1.25"ZWO Optical Red 1.25" 90%ZWO Optical Green 1.25" 90%ZWO Optical Blue 1.25" 90%
Accessories Off-axis guider ZWO OpticalFocal reducer Celestron 0.63xFilter wheel ZWO Optical 1.25"Automatic focuser JMI MotoFocus+
Processed with Siril 0.99.6, GIMP (GNU Image Manipulation Program) 2.10.20 (revision 1), PHD Guiding (Stark Labs)


Frames / Subs

Lights (filter Luminance) 30 x 30 sec
Lights (filter Red) 30 x 30 sec
Lights (filter Green) 30 x 30 sec
Lights (filter Black) 30 x 30 sec
Darks 25 x 10 sec
Flats 50 x 0.01 sec
Bias 60 x 0.001 sec
Total lights integration time 1:00 hours


Acquisition

Date Sat Nov 14th 2020
Seeing 3 / 5
Transparency 3 / 5
Camera Sensor Temperature -10.0 ºC
Binning 2x2
Gain 200

- Mohamed

Celestron 8SE, Sky-Watcher HEQ5 Pro mount, Raspberry Pi 4 Kstars-Ekos-Indi server, MyFocuserPro2
ZWO OAG with ASI120MM Mini (mono) guide, ZWO ASI183MM Pro, Canon 600D T3i, ZWO EFW (LRGBHaS2O3), Celestron f/6.3 reducer

telescopius.com/profile/mhammady
Attachments:

Please Log in or Create an account to join the conversation.

2 months 1 week ago
Bart
Premium Member
Premium Member
Posts: 93
More
M 31 - Andomeda Galaxy #62949
Have you considered using a reducer/ flattener? They're not expensive and reduce the effective focal length to 1280 mm with an aperture ratio of 6.3.
With your 2.4 micron pixel dimensions, you're very over-sampled, especially considering the mount and seeing.

Another piece of advice: isolate your SCT tube. Only the tube. This reduces tube currents dramatically!

15 cm wavefront condensor | Earth rotation undo-er | Few photon discriminator plates | Photons to electrons transmogrifier | Stellarmate

Please Log in or Create an account to join the conversation.

2 months 1 week ago
mhammady
Elite Member
Elite Member
Posts: 196
More
Topic Author
M 31 - Andomeda Galaxy #62951

Bart wrote: Have you considered using a reducer/ flattener? They're not expensive and reduce the effective focal length to 1280 mm with an aperture ratio of 6.3.
With your 2.4 micron pixel dimensions, you're very over-sampled, especially considering the mount and seeing.

Another piece of advice: isolate your SCT tube. Only the tube. This reduces tube currents dramatically!


Hi Bart

Thank you for the advice. I already use f/6.3 reducer all the time. This picture is with the reducer.

About the SCT tube isolation, what do you mean by that?


Thank you
Mohamed

- Mohamed

Celestron 8SE, Sky-Watcher HEQ5 Pro mount, Raspberry Pi 4 Kstars-Ekos-Indi server, MyFocuserPro2
ZWO OAG with ASI120MM Mini (mono) guide, ZWO ASI183MM Pro, Canon 600D T3i, ZWO EFW (LRGBHaS2O3), Celestron f/6.3 reducer

telescopius.com/profile/mhammady

Please Log in or Create an account to join the conversation.

2 months 1 week ago 2 months 1 week ago by Bart.
Bart
Premium Member
Premium Member
Posts: 93
More
M 31 - Andomeda Galaxy #62953
Ah ok! :)

I mean to thermally isolate the tube, in order to reduce 'seeing', but seeing that's generated within the OTA itself.

I don't know of a topic on an international forum. On the Dutch forum there are some topics about it, describing excellent results!
So I recently did mine, but hadn't had a clear night yet.

(Edit: here is the link, maybe use google translate: www.astroforum.nl/threads/koeling-c11.1467548/ )

Thought you might like to know that with negligable investment, you can get better quality images ;)

15 cm wavefront condensor | Earth rotation undo-er | Few photon discriminator plates | Photons to electrons transmogrifier | Stellarmate
Attachments:
The following user(s) said Thank You mhammady

Please Log in or Create an account to join the conversation.

Moderators: oleglupinixGonzothegreat
Time to create page: 0.385 seconds