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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.[/QUOTE]
How well does that Pentax system work though? Some sample images here a while ago made it seem it was a bit hit or miss and not too accurate with elongated stars still. Was that user error? Perhaps if there are more examples of 5 minutes no trailing at 100mm that would be very convincing.
Greg.
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