NGC 4656 + 4657
5 x 8 s = 40 s
18 x 10 s = 180 s
Jump to content
Posted 27 July 2017 - 06:29 PM
Posted 28 July 2017 - 01:50 AM
Really impressive captures. The detail and SNR on some of the galaxies is excellent for just 100s and just a 6" Alt Az scope!
One would have needed more complex (and more expensive) setup for captures like these just 3-4 years ago. I know that 5 years ago I was using a 8300 sensor based CCD and needed at least 2-3 minute sub exposures to get similar images.
Sometimes we don't realize how much more accessible this hobby has become so quickly.
Edited by Astrojedi, 28 July 2017 - 01:50 AM.
Posted 28 July 2017 - 07:49 PM
Well done, you made good use of your time for sure!
Posted 20 June 2018 - 06:59 AM
Some great images.
Please excuse my ignorance ( totally new to Astrophotography ) but when you say, as an example, NGC 6946 5 x 15s = 75s
I take it this means you took five exposures with the ASASI290MM, you then used a program
that combined / stacked these files together giving you the final image?
If I am wrong, and probably I am, can you please explain it for me.
( I am thinking about getting the ZWO ASI120MC-S USB3.0 Colour, as soon as I can, like you I have a 6SE )
Posted 20 June 2018 - 11:40 AM
Thanks for your nice comment.
Yes 5 exposures with each a exposure time = 15 s.
This is done using SharpCap (their is a free version with is very capable).
The program does "stacking images on the fly" so you can see the image on the screen improving when time goes on.
A colour camera is less sensitive then mono due to the bayer pattern.
As such longer exposure time are necessary. eg. 30 s instead of 15 s.
Tracking errors will then show up sooner.
Posted 20 June 2018 - 10:29 PM
Thank you for explaining that for me, stacking images on the fly sounds great.I will get Sharpcap.
Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics