Re: [APML] DWB111 Comparison

["Bobby Middleton" <bobm@koyote.com>]

I'm surprised at the difference of stars recorded. I presume this is a
result of the Ha filter on the CCD image.
Bobby Middleton



"To think that the eye could evolve by natural
selection seems I freely confess absurd in the
highest possible degree"    CHARLES DARWIN
http://www.koyote.com/users/bobm/astro1.htm

----- Original Message -----
From: Chuck Vaughn <aa6g@aa6g.org>

> List,
>
> With Mike cook's permission to use his image and hopefully Matt
> not minding using his javascript, I put together an unusual
> comparison of Mike's DWB111 CCD H-a image and an RC TP white
> light image I did sometime back.
>
> ftp://ftp.aa6g.org/dwb111.html
>
> This may seem to be a very apples and oranges comparison but
> it intended to be a comparison of what is possible, not an
> exact comparison between CCD and film. Mike's 8.5 hours worth of
> exposures are probably equivalent to about 2 days of exposures
> on TP, the latter being completely out of the question even
> if the former seems extreme.
>
> Besides the advantage of very low noise there seems to be another
> issue I have not seen addressed: Film looses resolving power at
> low contrast levels. It would appear that CCDs don't. The long
> focal length of my scope compared to Mike's doesn't make up for
> this. Maybe 16 three hours would come close but that's impractical.
>
> Chuck <aa6g@aa6g.org>
>
>
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