All these pictures were taken at prime focus with a 10 inch Meade LX200 GPS telescope and a Logitech Quickcam Pro 4000.

This is what I call a 'quick and dirty' webcam experiments webpage.

So you will not find my prettiest pictures here, but experiments I did.

Here are the reasons for posting these quick and ugly pictures on my website as well.

Last night was cloudy so today I did not have any images to process.

I therefore reprocessed some of the previous 2 days' images.

5 June 2004 at 18:48 300 of 450 images stacked Frames captured for 120 seconds	5 June 2004 at 18:48 Handpicked 150 frames stacked Processed 8 June 2004	5 June 2004 at 18:48 Photoshop staturation, contrast Processed 8 June 2004

Europa is visible at top right, its shadow transit barely visible at top right on Jupiter itself as well.

It is not the quantity of frames you stack that count, but the quality - 150 GOOD ones give better results than 300 average/poor one.

The reprocessed image shows the shadow transit more clearly.

I compared my pics to roughly speaking the worldwide top 10 amateur photographers of Jupiter .

Obviously I am not happy with my pics. Here are ( just some of ) my excuses:

• I do not have/use a wedge. So I am limited to 60 secs of exposure time. Other people expose for 2 or 3 minutes. So they capture 2 to 3 times as many quality frames to build their images.
• Some use an IR filter. I still use the Logitech's build in filter. A standalone quality IR filter costs the same as one webcam. So the IR filter in the webcam must be 'cheap' stuff.
• Some people use 10 inch refractors. These telescopes give brighter and higher contrast images.
• Some use 3x barlows. My image of Jupiter is too faint to do that. I only work at 2x barlow magnification.
• Don Parker uses a 16 inch telescope and I use a 10 inch.
• Tan Wei Leong uses a 10 inch refractor.
• Damian Peach has years of experience.