Terry B
22-05-2007, 11:01 PM
Dear All
I have bought a skywatcher 120mm F5 refractor to use mainly as a guide scope. Whilst this is a pretty low end scope I have had a go at imaging through it. With my CCD the field is about 40arcmin wide. I must say it makes for simpler imaging compared to the VC200l with an image width of 14arcmins.
I haven't got the colours correct yet. The images through the blue filter was unusable as my focus was bad and I had some fog on the filter (it was getting pretty cold:D). I have faked it using the green image for both the blue and green channels.
The exposures were short. luminescence were 15 secs only X 24 and totals of 3 mins/ colour.
I could not use any longer exposures as the blooming became much too much with longer exposures. Even still a number of stars including eta carina had full wells. Not sure how to get around this.
So how do you get around the blooming?
I have bought a skywatcher 120mm F5 refractor to use mainly as a guide scope. Whilst this is a pretty low end scope I have had a go at imaging through it. With my CCD the field is about 40arcmin wide. I must say it makes for simpler imaging compared to the VC200l with an image width of 14arcmins.
I haven't got the colours correct yet. The images through the blue filter was unusable as my focus was bad and I had some fog on the filter (it was getting pretty cold:D). I have faked it using the green image for both the blue and green channels.
The exposures were short. luminescence were 15 secs only X 24 and totals of 3 mins/ colour.
I could not use any longer exposures as the blooming became much too much with longer exposures. Even still a number of stars including eta carina had full wells. Not sure how to get around this.
So how do you get around the blooming?