Hi
Seeing was wobbly, possibly from thermal instability in scope due to rapid ambient drop on dusk - but good enough to see the SEB extent and Io plus shadow in transit along it. Used a deep red filter and short exposures on Copernicus to help with seeing - amazing the effect the Copernicus impact had on it's surroundings. Thanks for looking.
Last edited by Shiraz; 16-01-2011 at 11:03 AM.
Reason: tidy up
Both very nice shots Ray. Nice catch on the Io transit. That's a neat trick with the filter for the moon. Your getting lots of good detail on the lunar shots.
Hi Michael. Thanks for your comments. Yes, imaging in ordinary seeing is a balancing act and going to longer wavelengths can sometimes help.
Hi Paul. Thanks for your comment and feedback on the colour. I am having major trouble with colour balancing in poor seeing. The balance changes depending on the size of features, with finer features tending to go magenta - I haven't found any way to compensate without destroying the overall balance in extended regions of the image. It could possibly be CA in the Barlow, but I rather suspect that it may be something fundamental to do with the way the smallish scope aperture deals with bad seeing effects. I am also working through the processing to see if deconvolution introduces any gremlins and if there is any way to compensate for the effect - would welcome any ideas. Of course good seeing would largely fix things.
Hi Shiraz / Ray, You have a very good amount of detail for an 8'' mirror (presume an 8") and considering juups distance at present, that is a great result. I was wondering what size Barlow you used, 2x 3x etc ? I have dabbled at juup with a 6" but now have an 8" for the task and am curious, for that is a very pleasing capture IMO.
Cheers Bob.
Hi Bob. thanks for your kind comments. The scope is an 8inch f4 GSO Newt with a 3x Televue Barlow to get out to a little over 4m fl (including an extension and the filter wheel). Regards Ray
