Astromart

April 20, 2005 04:32 PM Forum: CCD Imaging and Processing/Solar System

Saturn from April 16, 2005

Hi Paul -

Saturn is getting smaller and more difficult each night. I took some images the other night - a few decent streams right after sunset and then it all went to pot very fast. I did have a chance to try using and RGB filter wheel and a red filter for luminance. The results were very surprising - more detail could be seen in the red streams at .25 sec exposure than in the white light streams at .025 seconds! Will post the result when I have a chance to finish processing the image.

cheers -
Alan

April 20, 2005 04:33 PM Forum: CCD Imaging and Processing/Solar System

Heraclitus & Licetus

Posted By Alan Friedman

Hi Ed -

Nice work!!

Alan

April 22, 2005 02:44 PM Forum: CCD Imaging and Processing/Solar System

Saturn (farewell) with moons

Posted By Alan Friedman

Thanks to all for sending your comments!

best -
Alan

April 22, 2005 07:10 PM Forum: CCD Imaging and Processing/Solar System

Baader IR filter

Posted By Alan Friedman

Hi Mauricio,

Yes, I think these filters are helpful. In an optical system with refractive elements the UV and IR foci may be quite far off from that of other wavelengths lending a softness to the image and blurring fine detail. This is especially the case with IR because most CCD chips are sensitive at these wavelengths - and also for objects lower in the sky, where the atmosphere acts as a refractive element and spreads the focus of the red and blue further apart.

The drawback is that there is some light loss from this filter so exposures will be lengthened a little. Fortunately the filter is reasonable - you can try it out without a big investment and see if it helps.

Alan

April 22, 2005 10:09 PM Forum: CCD Imaging and Processing/Solar System

Jupiter - my best so far

Posted By Alan Friedman

Hi Russell -

Beautifully done!

Alan

April 24, 2005 06:40 PM Forum: CCD Imaging and Processing/Solar System

JUPITER meets ED80...

Posted By Alan Friedman

Hi Ivan -

Cool! Your 80mm shows a lot of detail.

Alan

April 24, 2005 06:44 PM Forum: CCD Imaging and Processing/Solar System

Short Jupiter animation 2005.04.20.

Posted By Alan Friedman

Hi Oliver -

A very nice short movie. It is interesting to see how much sharper the view seems when the details are moving.

Thanks for sharing it -
Alan

April 25, 2005 10:25 PM Forum: CCD Imaging and Processing/Solar System