Quote:
Originally Posted by RyanJones
Good to see you testing out the new equipment Martin.
May I suggest a more effective test would be of a bright star in a star field. Maybe Achernar would be a good choice at the moment. Take an image with the main bright star on and off axis. Split the resulting channels and show the halo or lack their of for each channel. Unprocessed raw from the camera . You could also take one with no filter as a control image and if you still have the L-Extreme, repeat the process so you are comparing apples with apples from the same night and same equipment. Also testing with the f6 is likely to result in significantly reduced halos than your f/5s. I’m not sure if you have the 8 with you in Sydney or if it’s down south with your 10”. If you don’t you’ll have to wait for the real test.
Cheers
Ryan
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Thanks Ryan
Yeh a bright comparison would be ideal
I did compare an M8 captured in June with same scope, similar exposures and the L Extreme and yep halos are exhibited on all medium to larger stars
I also checked a few M8’s with my 8” f5 and L Extreme and yes halos are there similar to the 6” f6
I’m also stoked at the level of detail I pulled out for only 1.5hrs under Bortle 7/8 with only 2 min subs. I get better SNR with 2 min subs using the Antlia ( Ha 5nm , Oiii 5nm ) than I do with 3min subs using the L Extreme ( Ha 7mn , Oiii 7nm ). I agree with Mono and Narrowband filters you can push long subs ( 5min + ) to capture and expose more detail but with OSC ( ZWO2600MC ) at least in my experiences under heavy LP , the longer subs just introduce more noise.
So for the immediate future under Bortle 7/8 in Sydney I’m going to limit my subs to 2min for Narrowband and 60 sec to 90 sec for Broadband
Down South under Bortle 3, I push much longer subs for both NB or BB
Cheers
Martin
