From: Alan Friedman <alan@greatarrow.com>

Date: January 7, 2009 10:46:36 AM MST

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] DBK on Astromart

There have been other threads on this group that discuss the pros and cons of color vs. mono cameras - might be worth doing a search through the archives.

In addition to the resolution advantage of the imaging chip in a mono camera, there is a noticeable improvement in atmospheric stability using a monochrome camera and filters to isolate narrow slices of the visible spectrum - perhaps corresponding to 1-2 levels on the pickering scale, depending on the wavelength of light (stability increases witht he wavelength of light.) There is, of course, a loss of light with filtration too - which will bring the mono camera closer to the sensitivity of the color models.

best,

Alan

On Jan 7, 2009, at 6:54 AM, Mark Gaffney wrote:

I have a DBK 21A F04.AS & it`s a colour job.("B" stands for Bayer) The "M" in DMK stands for Mono. With the Monos you`ll have to image using a colour filter wheel whereas the colour camera does it all in one shoot. i.e you`d have to take 4 movies- LRGB of each object being imaged. My next purchase may well be a Mono of some description as they give higher resolution images. Mark. P.S The DFKs are also colour jobs I understand.
On Wednesday, January 07, 2009, at 10:43PM, "Willie Strickland" <cwskas@earthlink.net> wrote:
>I thought I had found a mono DBK 21AF04.AS on Astromart, but I was
>just informed it is the DBK color model. The seller just changed his
>ad. I cant make up my mind whether to hold out for the mono or just
>get the color one. Opinions please.
>
>Actually, I dont see any DBK models on the website, hmmm. I bet what
>he has is a DMK 21BF04.AS.
>
>Willie
>
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