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Forum: Pentax K-3 & K-3 II
02-29-2016, 12:00 PM
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I think you could get away with f4 or something; f8 makes even the 300second image rather dark.. You can probably use a higher ISO, as well. Yes, f8 and ISO 100 should give "best quality", but with astrophoto gathering as much light as possible is more important than that. And the lens and camera you are using are both good enough to use lower f number and higher ISO.
Anyway, make sure you are using the latest firmware on your gear.
DC shooter got the rest
This could be part of the problem. For SR it is usually recommended you input the nearest wider focal length so the SR will undercompensate (be less effective) rather than overcompensate (potentially introduce extra blur). I am not sure if the astrotracer behaves in the same way, but it probably does? Maybe someone else knows more specifics
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