From: Alan Friedman <alan@greatarrow.com>

Date: October 18, 2010 11:51:31 AM MDT

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] Help with solar mosaic

Hi Jim,

Assembling a full disk mosaic of the sun from small pieces is very difficult. It will require a lot of small region levels adjustments in Photoshop - probably using the marquee tool to select small areas. It's a pain and probably only worth it when the seeing is good enough to justify the time and effort. 

I would recommend cutting back the focal length and using your 1600x1200 Scorpion camera to shoot all or most of the sun in one fell swoop. 

That said, your image looks rather nice despite the patchwork quilt effect. 8^)

alan

On Oct 18, 2010, at 12:41 PM, jimchung2338 wrote:

Seeing around Toronto has been pretty miserable of late, there were two nice Jupiter transits last week but the results were so poor that I didn't even bother processing the data, just deleted it right off the drive.

Saturday day was just as poor but I tried some solar imaging and even worse, attempted a solar mosaic because I had never tried it before.

The lack of stable surface features makes lining up the mosaic images very difficult and it got worse as I started building the solar structure up. I ended up deleting the top 2/3rds but I'm still left with the uneven illumination of the various frames. I don't know if its possible to process them out in PS.

http://dl.dropbox.com/u/4852049/sunmosaic2small.jpg

Jim