From: milton Aupperle <milton@outcastsoft.com>

Date: December 27, 2010 1:32:41 PM MST

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] Narrowband Imaging with Flea2

Hi Jim;

On 27-Dec-10, at 11:39 AM, Jim Chung wrote:

Hi Milton,

I'll have to check the preferences panel, I did think it odd that the

extended exposure was so short!

That would be the only reason you would get 40 seconds.

I realize the demands of narrowband imaging, I was just trying to push

the envelope with such a fast scope because the lay public at star

parties don't have the patience to wait 10 minutes for an image to

form, they want to see it live.  I had thought about using a Mallicam

but that just introduces more cost into the project and I'm still left

with a small chip.  I plan to remove the sensor entirely from the 10D

body, remove the hot mirror filter and then do some microscopic

soldering to reconnect it via a cable back to the body.  I know the

Bayer layer will still reduce QE but the camera only cost me $70 off

eBay!   The bigger problem is sourcing a planoconvex lens to flatten

the curved field of the Schmidt at the ccd sensor!

Why not have a look at some of the LPR filters and then shoot without the HAlpha? You could probably get down to the maybe 10 second range with wide band for brighter nebula. And HAlpha won't be of much use for galaxies or star clusters.

Some LPR are more restrictive than other models.

The Antares LPR let about 50% less light in than Hutech IDAs LPR I'm using now. But I was shooting from the downtown core and from there, the light pollution was extreme.

HTH...

Milton Aupperle