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cpc6128
You can try some shots with the lenses you have at the moment. The hard part if focusing. Using your 15-55 you will get around 50 sec of exposure when set on 15mm lense and down to 15 sec for the 55 mm setting, slightly longer if you are pointing near the south pole. Set your f ratio to as fast as possible set it up on a tripod and give it a go.
The problem is unless you have a bulb/cable release the longest you will be able to go for is 30 sec exposure. So set up on a tripod, focus as well as you can on a bright star, set up fo 10 sec timer delay and away you go.