From: Ray Byrne <ray@in4media.co.uk>

Date: December 8, 2010 4:47:05 PM MST

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] 150mm PST Monster Lives!

Hi Milton,

Is this in regard to the use of flat fielding? I may be wrong here but the problem is inherent to the filter itself so a flat field frame would have the same problem and the light source would have to be incredibly bright. I don't understand! The PST as a filter just has that sweet-spot it seems to me and you live with it or get a bigger filter (at $$$$ more cost)

just my two-pen-north

Ray

On 8 Dec 2010, at 23:23, Milton Aupperle wrote:

Hi Jim;

I still wonder if you could not use a light box, with maybe a halogen
bulb? You'd have to worry about it melting the plastic diffusers, but
it should put out a lot of light in the 65 0nm range.

TTYL..

Milton Aupperle

On 8-Dec-10, at 2:49 PM, Jim Chung wrote:

> Thanks Milton, unfortunately I still get that uneven brightness. BTW
> got the long exposure working on the Scorpion, trying that out on
> something EVEN cooler this evening!
>
>
> Jim