From: Jim Chung <jim_chung@sunshine.net>

Date: September 19, 2010 5:11:39 PM MDT

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] First light Flea2

Hi Milton,

So that's where Alan is!

Hmm, you know these were Flea2 that do not bear the PGR logo so I wonder if they were made for some specialized function with a different glass covering, or would they be substandard?  I don't think PGR would dispose of cameras that didn't pass QC by selling them as disavowed merchandise.  I find I have to use quite a bit more gain at 33mS, on the Flea1 I had to turn the gain down to about 50% because pixel oversaturation would set in, especially in the Green channel.

Jim

Quoting Milton Aupperle <milton@outcastsoft.com>:

Hi Jim;

On 19-Sep-10, at 2:12 PM, jimchung2338 wrote:

It was supposed to be clear all night during the Ganymede transit on

Saturday morning, but of course it was not.  It finally cleared

after 3 AM and I just managed to capture some Jupiter data while it

was descending behind my neighbour's tree.  I'm still working on

that data but the Flea2 seems to be significantly less light

sensitive than the Flea despite both having the same Sony ICX204

ccd.  Any thoughts on that Milton?

We are comparing same type of CCD (Mono to Mono) right? Color CCD's

will be a lot less light efficient as they have the Bayer RGB filters

on the CCD.

About the only things that could be different is the Gain levels or

possibly glass cover plate.

Gain isn't CCD dependent, it's FPGA / Processing dependent. So a gain

of 100 on one camera may not be the same as the gain 100 on another.

Or perhaps the cover plate glass is different?

Anyway, here's the Sun from today, lots of activity.

http://dl.dropbox.com/u/4852049/SunSept192010b.jpg

Nice image.

I saw the sun briefly on friday, first time in 3 weeks. One of the

wettest falls I can remember in 20+ years.

I see Alan got to use the Mt. Wilson 60-inch telescope over the

weekend too:

http://spaceweather.com/

Nice shot of Jupiter.

Milton J. Aupperle