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The lxd 55 or one of the "earlier" Chinese mounts will do it. I have got wide fields piggy back up to 45 minutes unguided on each (one not a goto) and upto 200 seconds thru 80 x 400 ar when perfectly polar aligned. Certainly it is difficult to get 200 seconds but I have done this without star trails.. the secret is simply use a short focal length you can get away with it.. each of these mounts, at least for me, were better left unguided as when manually corrected problems creek in..it could be just me but Any amount of trying saw a better result if they both are left untouched. My method has always been to start with 60 seconds (thru the scope) and then one at 70, 80 and so on until the trails say dont bother going longer. I feel you will have lots of fun even with short exposures as there are many objects that you can get a decent capture with short exposure and short F/L. Also remember planet shots and Moon shots, sub second exposures are all you need...
good luck
alex
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