I just can't see the attraction of the starlapse, if I was going to lug that around I'd rather get an EQ5.
For me the attraction of the Pentax System, the Astrotrac or the Polarie is that you can carry everything you need in a small backpack, much the same as going on a photographic expedition.
Once it gets larger than that, I'd rather have a real mount.
The Pentax is a winner for me as it is the cheapest, you effectively get a DSLR for free, you only need a standard tripod and don't need to polar align.
The Astrotrac is great if you get the full system as it all packs inside the pier and you can throw it on your back and is beautifully engineered. The Polarie isn't for me, but I can see it's appeal, it is small and seems to work okay, I'm not sure how easy it is to get a good polar alignment though.
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