Both of them are Pentax, the K200D and the KM/K2000. They both take AA batteries, you can shut off AF by switching to manual, and you can lock the shutter open, with a remote cable(I seen one person said it was $300 USD. The one thing you have to watch out for is leaving the shutter open too long. Most of the astronomy people seem to leave it open for about 2 min, any more than that will build up to much heat and leave a ton of noise in the photo and possibly cause sensor damage.
Hope that helps.
Until 20 years ago I took about a thousand Hi-speed pics for ballistic research, using a Zeiss Contax (stolen since).
Now I would like to get in again using a DSLR. This Camera must have some features to keep the shutter open for some minutes. Manual switch on/off is not good enough, I need to integrate the camera into an automatic system (sort-off) that can via cable and mechanical or electronic switch open and close the shutter.
Further, auto focus feature must be selectable (switched off) and aperture size must be manually selectable.
I live in Africa and have no access to any shop you might refer me. I am just looking for a model that fits. Sales staff cannot say more that "Oh this is a very nice camera", which does not help me at all.
Almost forgot, Camera must use normal AA cells (Lithium or rechargeable), but NOT an dedicated battery pack.
If anybody likes to know my troubles I had initially an how I solved them, I gladly tell of my experiences and show some pics as well or post a link to my incomplete website.
Thanks in advance