I have used my D90 and I have tried my D7000 on my Meade LX90-SC 8 inch scope .
I had far better results with the D90 on my old ETX125 (that the grand-kids can use ).
I have concreted two steel post into the ground in two different areas of my farm so I can mount the telescope securely with not much vibration (that a tripod will have ).
two locations for the different seasons .
Using this method have very little vibration when taking shot at great distance (Venus Jupiter Saturn) , the shots Ive tried with my D7000 are not good and I haven't progressed far with any better results .
The D90 shots are great ,when you can see Saturn's rings in a picture you have taken ,,that's great for me .My older moon shots were awesome (to me )
I cheated and put a Philips PCVC740K ToUcam PRO PC video camera on my new 8inch telescope scope and got some great shots direct onto my laptop ,everybody can see them and nobody has to touch the telescope and tripod ,its all on automatic using Meade's Autostar hand paddle .
I will persist with the D7000, I have all I need to take fair shots ,just the setting up,trial and error in manual mode ,but patience is lacking at the moment .
You must have a remote cable for this exercise .
Any vibration is a big problem .
As the author of the above says ...How about a 1540mm lens !
Now that's on a 5 inch like the ETX125 ,my 8 inch scope give me a huge telescopic lens with a focal length of 2000mm.
But he results (so far) aren't as good as my older 8 inch ETX125
Its a great sideline hobby,something different to just taking
down to Earth photos .
Im wondering as I type this if I can use the D7000 using LiveView Video mode when attached to the back of my Meade telescope......???