Hi AstroBin hive mind,
Question for you all. I've been imaging the Flying Bat and OU4 from the UK in 'nautical' night/twilight (yes I know, ill advised!) and I'm getting the below aberration on this bright-ish star (think it is HD 202830 +9 Mag) in my cropped OIII stack. Image is 36x600s OIII with the FRA500 @ f/3.9 and I've been really strict in only selecting the very 'best' frames I can get right now (via SFS) which is about 1hr per night. Filter is the Optolong 3nm OIII, there is a very small amount of tilt in the system but the target is centred on the chip.
I'm thinking this is a 'halo' albeit not predominantly circular, or a reflection artefact. Are certain types of stars more prone to this? The two central ones seem of similar magnitude visually however I think the other central star is actually brighter in reality. Just keen to know any advice on its source and reducing this, shorter subs? Have I reached a limitation of the filter imaging 600s @ f/3.9?
Any feedback welcome.
Thanks,
Ollie
Question for you all. I've been imaging the Flying Bat and OU4 from the UK in 'nautical' night/twilight (yes I know, ill advised!) and I'm getting the below aberration on this bright-ish star (think it is HD 202830 +9 Mag) in my cropped OIII stack. Image is 36x600s OIII with the FRA500 @ f/3.9 and I've been really strict in only selecting the very 'best' frames I can get right now (via SFS) which is about 1hr per night. Filter is the Optolong 3nm OIII, there is a very small amount of tilt in the system but the target is centred on the chip.
I'm thinking this is a 'halo' albeit not predominantly circular, or a reflection artefact. Are certain types of stars more prone to this? The two central ones seem of similar magnitude visually however I think the other central star is actually brighter in reality. Just keen to know any advice on its source and reducing this, shorter subs? Have I reached a limitation of the filter imaging 600s @ f/3.9?
Any feedback welcome.
Thanks,
Ollie
