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waskeyc
journeyman
Reged: 06/27/08
Posts: 15
Loc: Virginia
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Attached is my best image of Jupiter so far. 
It was taken with a cheap digital camera in video mode. The camera was rigidly attached to a high power eyepiece on a stationary 4” achromatic refractor. About 250 images were stacked and wavelet sharpened in Registax to produce the final image.
Question: Is this the best I can expect with this equipment, or are there suggestions for improvement?
Technical details:
Camera: fully zoomed to 112.5mm equivalent, 640x480 15fps, no exposure compensation controls in video mode
Telescope: Celestron C4-R 1000mm focal length
Mount: CG-4 undriven
Eyepiece: 9mm Plossl and 2x Barlow (for 222x)
FIRST POST! 
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Chris_H
Carpal Tunnel
Reged: 11/24/03
Posts: 2858
Loc: Norway
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Welcome to CN!
Yes you can do better but it will never rival the webcam shots  Have a look at the Canon Powershot group. Here you can see what is possible
With this kind of imaging, more aperture is always better.
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Chris
"Big Papa Smurf" (254mm f/4.7 Sky-Watcher Newt)
Custom Orion Optics 150mm f/8 reflektor "Planet Killer" (On its way!!!)
SPC900
Canon Powershot A610 (CHDK modded)
Canon 10D (modded)
Canon EF 50mm f/1.8 II
Canon EF 70-200mm f/4 USM L
My Website
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john D
All you have to do is ask!!
Reged: 08/05/07
Posts: 4965
Loc: Midlothian, VA
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welcome to CN! good shot! 
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Meade ETX-125
Meade LXD55 mount
Philips SPC900NC webcam
Seymour Solar filter
Backyard Observatory
 -Midlothian VA
--Land Of The Free Because Of The Brave--
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ccs_hello
Carpal Tunnel
Reged: 07/03/04
Posts: 2805
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Welcome to CN!
Great picture!
If you can state your camera model, a calculation can be explained.
Clear Skies!
ccs_hello
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ccs_hello
Carpal Tunnel
Reged: 07/03/04
Posts: 2805
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P.S. for P&S digicam, afocal is the only option.
Calculation is here:
http://www.cloudynights.com/ubbthreads/showflat.php?Cat=0&Board=low&Number=2039681
(Afocal section)
Clear Skies!
ccs_hello
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waskeyc
journeyman
Reged: 06/27/08
Posts: 15
Loc: Virginia
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Camera model is Nikon Coolpix L11.
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Chris
Celestron C4R
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waskeyc
journeyman
Reged: 06/27/08
Posts: 15
Loc: Virginia
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Actual zoomed focal length of the camera is 18.6mm, with a 6MP 1/2.5 in CCD (roughly 6mm diagonal).
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Chris
Celestron C4R
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ccs_hello
Carpal Tunnel
Reged: 07/03/04
Posts: 2805
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Chris,
9mm with 2x barlow gives about fl=4.5mm.
So the afocal system gain is 18.6/4.5 = 4x
(Prime focus imaging for a lensless webcam is 1x).
OTA fl=1000mm
with 4x magnification, the new fl is about 4000mm.
Type-1/2.5" CCD has an image area of 5.75mm * 4.3mm, while a
type-1/4" webcam has 3.69mm * 2.77mm.
P.S. P&S digicam in movie mode tends to compress images more.
Clear Skies!
ccs_hello
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