From: Alan Friedman <alan@greatarrow.com>

Date: August 15, 2010 12:26:20 PM MDT

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] a split personality

Hi Jim,

Thanks - these images are all taken in white light using a full aperture filter made from Baader film. I used an 8nm bandpass Ha filter in front of the camera to moderate the seeing turbulence. 

best,

Alan

On Aug 15, 2010, at 2:14 PM, Jim Chung wrote:

Alan,

As usual fantastic imaging and processing. Did you mount your SM90
off axis to your AP Mak?

Jim

Quoting Alan Friedman <alan@greatarrow.com>:

> Hi all,
>
> I used this week's hot, humid and sometimes sunny weather to
> experiment with my 10" mak/cass and the photogenic little sunspot
> region 11903:
>
> http://www.avertedimagination.com/img_pages/split_personality.html
> (you can seen the full size pictures by clicking on the image panes)
>
> This spot had an earth-sized umbral core... not particularly
> newsworthy - but it did perform a nice split over several days and
> made an interesting subject if you brought the magnification up high
> enough. The seeing was never very good - but the gentle morphing and
> bloating frame to frame allowed reasonably accurate stacking. And
> although the granulation was only hinted at in a handful of frames,
> doing multiple alignments with the bright bits of faculae allowed
> the convection cells to rise to the surface with a little unsharp
> mask.
>
> be cool,
> Alan