Well I've been playing with the D40 for the last few months, and it can be done
I have purchased two things that really compliment this camera setup:
- cheap ebay version IR remote; and
- Tether Pro camera control software also off ebay (sooo much cheaper than the Nikon version and works well!)
I'm still mega new to the astro stuff, but here are a few pics to demonstrate that the Nikon D40 is good enough for a Noob. They are my first guided astro photos on the NEQ6 Pro with the ED80 Pro of the Great Nebula in Carina, NGC 3372:
http://farm5.static.flickr.com/4006/...42cfa455_b.jpg
http://farm5.static.flickr.com/4013/...b2bc39f6_b.jpg
http://farm5.static.flickr.com/4030/...5e393968_b.jpg