From: Milton Aupperle <milton@outcastsoft.com>

Date: October 21, 2010 8:21:00 AM MDT

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] solar mosaic reattacked!


Hi Jim;


Did you ever try doing those longer exposure flats of the sunlit Sky? You might have to go to 0.5 second exposures (I'm guessing as I have no scope like your to test with), but at least it should help remove the unevenness.


HTH..


Milton Aupperle


On 20-Oct-10, at 8:38 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