From: "Tim" <tjp314@pacbell.net>

Date: January 16, 2006 11:12:33 AM MST

To: Astro_IIDC@yahoogroups.com

Subject: Re: Image scale comparison for different pixel sizes

Kurt:

I was going to suggest the Scorpion 640x480 camera, but Milton beat me to it! ;o)

-Tim.

--- In Astro_IIDC@yahoogroups.com, Milton Aupperle <milton@o...> wrote:

Hi Kurt;

On 15-Jan-06, at 3:41 PM, mihalco wrote:

Hi Milton,

I'm new to the group and in the process of choosing a camera. After

reading through the messages, I'm leaning to the Dragonfly2 from Pt

Grey. I just wanted to point out that both the Flea and Dragonfly2

are available either with the 7.4 micron (640 x 480) or 4.65 micron

(1024 x 768)pixel Sony imagers. The Dragonfly 2 is also capable of

12 bit like the Flea. I think I'll be going with the larger pixel,

lower res mono version. Thanks for the group - lots of good info

here.

Regards,

Kurt Mihalco

Yep - very true. You can get the Flea or the DragonFly2 with either a

7.4 micron / 640x480 CCD or a 4.65 micron / 1024x768 CCD. The

comparison images of the moon were just to show the difference that

the CCD Pixel Size makes with resolution, field of view and exposure

time.

Currently I don't recommend the Dragonfly2 Color Camera but that may

change in the future as PGR is looking at adding a register to force

it into a "bayer" color camera. Also I've asked Point Grey if they

could look at allowing us to power the Sony CCD amp off via a

software switch for longer exposures. The TI TSLV1501 chip had some

low level register hooks that I could hack into for this, but not in

the PGR cameras.

Some day when I "win" a lottery, I'd like to get a 9.9 micron

Scorpion monochrome camera, which has 179% of the light gathering

capability that my Flea 7.4 micron has and 453% more than a 4.65

micron CCD can do. Of course if I win a lottery I'll finally be able

to get a bigger scope, a good mount (which doesn't have a RA PEC

error measuring 90 arc seconds over 5 minutes of time) and buy a

place where I can set up an observatory (probably in Saskatchewan).

TTYL..

Milton J. Aupperle

President

ASC - Aupperle Services and Contracting

Mac Software (Drivers, Components and Application) Specialist

#1005 - 815 14th Avenue. S.W.

Calgary Alberta Canada T2R0N5

1-(403)-229-9456

milton@o...