Originally posted by Adam My humble theory is that as great as the the high sensitivity of the new AF system might be, the following things make it less impressive that it sounds:
- We still only have 11 AF points, which means that action shooting will still not be nearly as smooth as on cameras where the VF is decked with points
- At -3EV there is pretty much no light at all, meaning that AF readings might be unreliable even if the new system is able to operate in those conditions
- Lens focusing speed remains a constant, meaning that the only way this new AF could be faster is if it significantly reduced focusing latency (not likely given that the camera is till running the 4-year-old prime II)
- Metering won't properly work at negative EVs (AE sensitivity: 0-22EV)
- It's been my experience that thanks to the AF assist light, the old K-5 does a very good job of focusing accurately in low light (or no light)
I sincerely hope that Pentax is working on another body, and that it will have more AF points. Having pro-grade features in an affordable APS-C body is the only way I think Pentax is going to be able to remain competitive if they plan on sticking to APS-C rather than full-frame.
I think critically, the AF points are also too large, compounding issues. In fact, it appears whatever they focus on is significantly outside the borders, especially the center point.
I'll wait and see what the real deal is. I'm not buying anytime soon, since I just got my K-5, but I like this, that Pentax has evolved a good, solid model, particularly with an option to delete the AA-filter. I like sharp pics at the expense of other things, so that will work for me, hopefully.
I shoot dark metal concerts, where the lighting is poor, smoke levels high, and movement is extremely fast, often mandating ISO 10,000, so better AF in the dark is welcome. I really don't like my front focus issues the moment it gets dark. Drives me nuts.