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07-22-2016, 11:18 AM   #16
Pentaxian
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Good points, Gimbal & lister6520. You are right that angular motion of the subject field resolves as nonlinear motion at the image plane.

I don't think Ricoh is aware of this issue in that their recommended maximum exposure times ( PENTAX O-GPS1 A handy GPS unit for digital SLR cameras, offering innovative features for effortless tracking and photographing of celestial bodies | RICOH IMAGING ) suggest the maximum (300 seconds) for any focal length under 50mm.

Personally, I've not yet used the astrotracer on the K-1 but I'll definitely try it with my Sigma 12-24mm DG.

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