Originally posted by madbrain Certainly not perfect, but recording unattended for 29min29s is a heck of a lot better than 7 minutes. Night and day difference, IMO. One is somewhat usable, at least with a remote control. The other is not.
Remember, on the Nikon, there will be a momentary interruption every 4 GB.
What puzzles me is the purpose for this rant. You started this thread with three questions, one of which is fairly easily answered. The first will be answered by the first owner to read this thread. We already know the pixel dimensions (3840 × 2160) and the 30p frame rate and a bit of math will allow an estimate of minutes to 4 GB. Bit rate is a cool thing to know and will likely be one of the early metrics to surface. Sure enough, by post #11 all three questions are answered and
none are a surprise.
In the course of the discussion it becomes clear that it is a no-win proposition for the K-3 because the 4 GB limit would always present well before the 30 minute mark with any "acceptable" bitrate. The 4 GB* and 30 minute limits both being stupid (and in the printed specs), there is no reason for joy in Pentaxland.
Fair enough...buyer beware! If you want to do an extended 30 minute 4K unattended take you had best not buy a K-3iii.
Steve
* I did a bit of sleuthing and near as I can tell, the 4 GB limit comes courtesy of the Milbeaut processors used by both Pentax and Nikon.