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Hi Simon...
All the advice above is good advice....im only a beginner myself,
and these guys know their stuff.
I have an 8" lx90 with which i have obtained some very pleasing pictures,and have used similar camera equipment to you. Some food for thought:
The 400d i had suffered from lots of noise at ISO1600 and above -
i did not find it all that good for astrophotography (great camera for its day and price in all other respects.)
I have attached a 7d to the back with a 6.3 reducer, and was very happy
with my eta carina pics, but with the weight of the thing it was very hard to balance, especially the closer to vertical the tube got.
Field rotation is an issue, but less so for subjects that are close to the meridian - so for those targets you can take longer exposures.
I have a ASI224, and with a 2.5x barlow this setup takes great planetary pics.
I can get reasonable DSO pics with an el-cheapo .5x reducer - wouldn't publish them in a magazine, but wows my friends.
I also just happen to have a 70-200 canon lens which i piggyback on the OTA, and attach the 224. this works really well for DSO's. the lens stops at f4 and has a very pleasing field of view for something like orion. I only need to take 15 second exposures with this, and stack hundreds.
No field rotation issues(that i can see)
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