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Forum: Pentax K-5 & K-5 II
07-29-2018, 04:58 PM
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I got my K-5iis pretty shortly after they came out, and the O-GPS1 certainly works with it (several images in my Astrophotography gallery if you like). I have used it with lenses up to 500mm, so I think the Sigma would do just fine. Mind you, you have to reposition the camera pretty often if you're going to stack, unlike with a German equatorial mount or a tracker like the iOptron. I sometimes struggle getting the "precise calibration" to take, but I've never had to give up. And the keeper ratio is lower too. But it's sure effective, and hella easier than packing one of those along!
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