From: Alan Friedman <alan@greatarrow.com>
Date: November 11, 2005 2:12:06 PM MST
To: Astro_IIDC@yahoogroups.com
Subject: Re: [Astro_IIDC] Re: Camera for guiding
Hi Duane -
Was the color version I sent to you any help in getting a sense of how the RGB channel images look when the color is pretty well balanced?
A lot of this is personal taste, but there are a lot of good images out there - it might be a good exercise to use one that you like and try to adjust the color channel histograms/curves to get close.
Your thoughts on color vs B&W cameras are good - there is an additional consideration, too. Unless you have a fabulous location, you will almost always get sharper images using a narrow band of the spectrum than you will in full white light. Even when doing white light solar images, using a green (or other) filter will stabilize the image noticeably. This is an advantage for the B&W camera with RGB filters, though I guess you could get good results using a color camera in mono mode this way too, although at lower resolution due to the bayer matrix. I almost never use my DMK camera without a filter - even on the moon.
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?
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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