|
Finally got a chance to check out my O III and CLS filters on a hazy sort of night. Eta Carina up near zenith, high humidity and high wispy clouds ( killed all viewing by about 8:00pm ).
O III filter darkens the viewing considerably but does make a significant difference to the Nebula dust. Without it I could barely see some discolouration around the central region but the O III defined it quite clearly out towards the edges and thes sweeping arches on either side. Some visible lanes within the dust and If I'd had time to get better light adapted probably could have seen more.
CLS Filter surprised me in firstly not dimming the view very much at all and then by also showing up the nebula dust. Not as clear or defined as the O III but a lot brighter overall. Again more time would have been nice but the clouds were not very cooperative.
I used the 25mm plossl with no filter, 20 SV with CLS and 15 SV with O III so was able to swap around quickly to compare. Switched the filters around a little also but the general comments on performance stand as above. Low cloud also gave a lot of reflected glare off local street lights, could just about read the paper under it. And it is very warm and humid, I was just out in my shirt sleeves.
Verdict. I am happy with what I've got. Gives me some options for visuals and photography later. Shame I didn't get a chance to look at Orion Neb but it's almost gone now by evening. There's always next year though.
|