Originally posted by 2351HD That makes sense.
I was hoping that with astrotracer that I could get 1 stop, so extend 20 to 40, or 30 to 60 secs.
More is good though.
The astrotracer will definitely give you +1 stop in shutter speed without much star trailing. However, I think the benefit of the astrotracer for ultrawide Milky Way shots in a full frame setup is less likely to be as impactful as it is on APS-C.
Example image:
https://www.instagram.com/p/BC8fPG-KkqK/ I shot this with a K-5iis and a Rokinon 14mm. Though it's a 1:1 crop, you can see star trails forming in the upper right corner. Obviously they trailed more in the areas that got cropped. When the full frame image circle is available, the level of star trailing in an ultrawide shot is going to be much more drastic.
HOWEVER: that was a 4-minute exposure. Cutting it down to a 2-minute exposure would do wonders for the minor star trailing I experienced, and that's only 1 stop of lost light. The ISO differences between the K-1 and the K-5iis would more than make up for that -1 stop in shutter speed. So this necks down the benefit of having the astrotracer for ultrawide shots... but there is still an extreme benefit of having it. 2 minutes without the O-GPS1 would be star trail city even at 14mm.
So for ultra-wide, I don't think we'll be able to abuse the astrotracer as much as I do right now. For normal and telephoto focal lengths, I think it will be just as functional as ever.