From: "KirkusMcGurkus" <kirk@stenvall.net>

Date: March 9, 2008 9:49:16 PM MDT

To: Astro_IIDC@yahoogroups.com

Subject: Re: DBK 21AF04.AS good for DSOs?


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



On 9-Mar-08, at 7:40 PM, KirkusMcGurkus wrote:


I've been using an OrangeMicro iBot for planetary imaging. Because of

it's short max. exposure time, I'm considering the purchase of a DBK

21AF04.AS which maxes out at 60 minutes.


Does Astro II DC support 60 minute exposure times with this camera?


Yes it does.


Is it possible to get good long exposure DSO images with a CCD camera

like this?


Raoul posted some DSO images he took with a mono version of the  

camera, which are posted in the DSO folder of the files Section:


StephansQuintet_20051014_RS.jpg


NGC891_20051126_RS.jpg


NGC7331_20051017_RS.jpg


And Allan took this


m57.jpg


with a DMK21BF04.


Most of these are less than 60 second exposures.


Also, can you clarify what you expect by "long" exposure (i.e. 1, 2,  

5, 10 minutes)? Without cooling a camera, the noise level increases  

pretty rapidly.


Milton Aupperle



Thank you for the reply, Milton.


I'm thinking multiple 1 or 2 minute exposures stacked. The only

experience I have with imaging DSOs is with my point and shoot though

an eyepiece for 16 second exposures (my point and shoot's max.). So

I'm not experienced enough to know what to expect from it or what kind

of exposures I'll be looking at.