Difference between 8" and 10" with Jupiter

[allan gould]

Was doing some avi reductions of Jupiter taken on 5 and 6 May with my 8" and 10". What became apparent is the difference in image size between the two scopes. The images have been processed the same but differences in seeing give some overall differences. What may be of interest is the image scaleand what was noticable to me is the amount of light gathered between the 8 to 10" scopes.
Regards, Allan

[[1ponders]]

Aperture and FL. Don't you just love the combination :D

Just wait til you have 640X480 happening :cool:

[astroron]

I had a look at Jupiter through a visitors ED80 and was amazed at the difference from the 40cm, I had not looked at Jupiter through a small scope for quite a long time:eyepop: :thumbsup:

[allan gould]

Tried it at 640x480 and the frames were a mess with interference lines across them. Must be some thing with the QC3000 and low light levels [or my laptop], so it looks as if I'm stuck at 320x240.

[[1ponders]]

What frame rates and exposure levels are you using Allan?

[allan gould]

I'm using 1/10 sec exposure, 5fps, ~50 % gain, 50-60% brightness and 320x240 resolution

[Skylark]

Allan, now you know why people get aperture fever!!! I will post some examples from the 20 inch once the weather clears up..

[[1ponders]]

Ok I thought it might be your frame rate, but not by the look of it. I get "interference" lines if I up the frame rate too far, but I'm talking 25+ fps

[allan gould]

Had a look at Orion nebula through a 22" dob with a beautiful mirror a few months back. It was sublime.......and etched into my memory. Want one, can't afford one, look through others. As far as the 640x480 issue for webcam capture , I'm now convinced its a limitation with the camera or its software. Have a look at the camera Damian Peach uses ($2000). I wonder if its something to do with the long exposure mods done to the camera lowers the frame rate that it can work at? Anyway I'll have to learn to work within its limitations.

[iceman]

What software are you using for capture, Allan?

[allan gould]

I'm using software written by Colin Bownes called Vega ver1.2.1. Excellent program with all the bells and whistles.

[iceman]

Have you tried alternate software (ie: k3ccdtools) to see if it helps the dropping frames problem?

[allan gould]

Same with other software; as I said maybe the fact that I'm using a modded webcam for imaging may have something to do with it.
Allan