From: Alan Friedman <alan@greatarrow.com>

Date: October 20, 2010 9:42:31 PM MDT

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] solar mosaic reattacked!

Hi Jim,

Just for comparison, here is the image scale with the Scorpion 1600x1200 at 450mm focal length:

http://www.avertedimagination.com/images/disk102010.jpg

This is one single frame, copied from Quicktime7 and pasted into Photoshop. I applied a .4 pixel gaussian blur, a .5 pixel unsharp mask and an auto levels adjustment (faded to 80%.) I have three videos to process for a full disk, but this quick preview took 3 minutes from start to FTP. 

Today was a pretty good day for solar imaging... seeing was still fairly stable when the sun got up high enough to clear the trees from my backyard (around 11am.)

Here is that nice filament (quite a bit more time invested in this one!)

http://www.avertedimagination.com/img_pages/great_wall.html

cheers,

Alan

On Oct 20, 2010, at 10:38 PM, jimchung2338 wrote:

Thanks to Brian, Alan & Milton for helpful comments on my first solar mosaic.

So I reduced the focal length back to 1000mm and seeing was better today as well. Uneven field illumination is still a problem which I tried to mitigate by creating irregular borders between the mosaic pieces. More mosaic pieces with greater overlap would also address this problem but I'm a little leary of taking on a hundred piece mosaic. There were also many interesting surface features which made aligning the pieces easier.

If you view it at 100% size the detail is quite good and you are less likely to notice the brightness of the seam regions.

http://dl.dropbox.com/u/4852049/SolarMosaic.jpg

Jim