Quote:
Originally Posted by Tamtarn
Amazing image Greg, the vast amount of clear detail within this colour range is incredible.
|
Yes I was surprised as it was taken from my backyard in Sydney and I live in Kellyville which is about 35kms NW of the city. Looking south I look through a lot of light pollution as that is Castle Hill, Parramatta, Liverpool and Campbelltown so a lot of suburbia and a bright sky glow.
So these 5nm filters are also very good (the O111 though seems to leak and Gradient Xterminator was needed to handle that - perhaps 1x1 will stop that problem).
I looked at changing from an RCOS to a few different scopes, an ASA was one choice and I nearly bought a 12 inch that had been "fixed up" but the seller suddenly dropped out when I quizzed him about some potential defects - buyer beware eh?
I have found F5 a good imaging speed with the FSQ - not so fast as to be super fussy and highly demanding yet very bright and detailed images with a reasonable imaging exposure time.
1268mm focal length is also a good focal length for many objects.
I have a smaller chipped FLI Microline 8300 on the way for galaxy imaging and close up views.
It should be a good setup and suits my specific requirements as I usually travel to my dark site and time is somewhat limited so a 15 hour megadata collection at F9 is out of the question usually. 3-6 hours at F5 will image just about anything.
I forget the ratios exactly but F5 is something like 5 times faster than F9, possibly more.
Greg.