http://www.iceinspace.com.au/forum/a...8&d=1187059822
Ok there are 4 tents in this image. You don't want the big one at the back

. Nor the green one at the back or the one with the yellow roof. Both of those have a fabric strip along the bottom of the door side where the zip attaches. This means you will have to lift the tent over your scope. Unless of course you can work out some way to remove the strip without ruining the zip.
The forth one (front left) with the silver sides and green dew cap has no strip along the bottom and can be easily moved to cover the scope and mount without having to lift over them. If they are still available (it was a challenge to find them but from memory Big W had them) they are the Bees Knees.