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

Date: November 11, 2005 5:49:12 PM MST

To: Astro_IIDC@yahoogroups.com

Subject: Re: Camera for guiding

Alan:

--- In Astro_IIDC@yahoogroups.com, Alan Friedman <alan@g...> wrote:

The idea of swapping a color and mono camera (there is no resolution 

concern for the color layer in an LRGB image) is an interesting one. It 

should be doable if both the cameras have the same flange to chip 

distance (ie are the same model). I've done this on saturn, using the 

Fire-I color and B&W camera on the same night. You could even use the 

color image again for quite a few weeks. But I think this might be even 

more of a headache than the color filter wheel?

I've done this before, but not recently.  First time I did it with my Starlight Xpress HX516 

for the luminance channel and an Electrim EDC 1000D color camera for the RGB.  The 

image scales were very different, and the Electrim camera was VERY "insensitive" and 

noisy, and you had to hit the "T" key (IIRC) when it looked like you had a decent image, in 

order to save it (and then type in a filename before you could get back to imaging).  It was 

like pulling teeth to get a decent result, and I only did it that way a couple times:

http://www.astroleague.org/marswatch/images/m199904/index2.html (scroll down to 

last submission on April 17th, 1999).  (Sidebar:  It's interesting to compare what folks 

were accomplishing in general way back then with what they're doing now!).

If I were to try something like that now, I'd instead use two similar cameras (but I'm not 

sure i want to spend $1K for another Flea) and put them either on a flip mirror (requiring 

you mirror reverse the results from one camera) or a turret (not requiring the plif  ;o)  ).

-Tim.

Keep at it - you will get it right. Your fine mars image was not a 

fluke!

Alan

On Nov 11, 2005, at 3:51 PM, Duane wrote:

Alan,

Have you thought about putting up a website? You have so many great

images, you really should. And then I could link to it :)

I went out and shot Mars again last night. Another night of dismal

seeing.

What I want to mention (and ask), is my colors were a bit closer to

normal this time, but not great. This time I took the image (fresh

from Astro IIDC) and put them in their perspective chanels without

doing anything else to them. Then I adjusted levels (in each chanel

individually) and got my final result which is still less than what

I had hoped.

Has anybody here tried the color version of this camera? I know the

loss in resolution is an issue due to the color bayer filter. I

don't think I'm really worried about the sensitivity loss because

that is probably close to the loss experienced with the color filter

wheel any way.

Milton, you said something about the chip being the same as the

unibrain but for the fact that the rest of the circitry was better.

Is it really worth the extra $300 and some odd bucks then?

I would stick with this camera except that I'm just not getting the

color filter wheel and chanels right and it's frustrating me. It

just isn't making sense. I know color theory backwards and forwards

and I know Photoshop very well. It seems like I'm doing what it

takes but the results are just not realistic.

I hope to try again tonight and see if I can figure this out. Any

help is appreciated.

Duane

--- In Astro_IIDC@yahoogroups.com, Alan Friedman <alan@g...> wrote:

On Nov 11, 2005, at 11:31 AM, Duane wrote:

  Duane

  PS. I lay claim to coining the frase, "Friedman-esk" for a

spectacular planetary image, or

  "unFriedman" for when they come out like the other 90% of my

images.

  Alan, can I copy right your name?  :)

Certainly - and I appreciate the generous thought -

but I think "Peach"y would probably be a better term!!

8^)

Alan

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