Originally posted by kenspo We'll even need a newer aps-c or the FF to see the potential of the new lenses. You won't get 100% out of the new 70-200 with the K-3..But stuff is happening behind closed doors..
Hopefully the FF will. But if the K-3 doesn't make full use of the new lenses, I would expect the lens to move so quickly that the lens moves past the focus point without registering that it was in focus, and then having to come back. You see this in old screw drive lenses that are 6.3 or slower, the speed of focus is geared up but there isn't enough light to look focus at that speed and the lens hunts.. SO, I'm wondering if you're seeing anything like that that would indicate the speed of focus is stressing the AF system?
I guess in the FF system they could bump the voltage to the new lenses to make them faster and have a recognition chip so the it doesn't fry the SDM lenses, but apart from more power to the motors, I'm not sure how the lens would focus faster than it does now. The only factor that could be different would be the camera's ability to recognize when the image is in focus. If it's not missing focus and hunting, I'm not sure how it could be any different. The .1 second focus speed on a D610 is based on a very short movement when focussing the lens. The .5 second focus speed on a K-3 is in part based on a much longer distance. There are only two ways around the slow focus speed. Move the lens element faster, or shorten the distance it has to move to get from close to infinity. Am I missing something?
In both cases the AF system has less time to recognize that the desired point is in focus. But just improving the AF focus lock system in the camera can't make up for slow focussing lenses.
Or in other words, unless Pentax starts making lenses designed with higher gearing or less distance to travel in focusing, I'm not sure how any improvement in the AF module is going to help. Most of the time, the AF system is waiting for the lens to get to the point where things are in focus. That's what I'd like to see improved i these lenses. If it takes the AF system a few years to catch up that's fine with me. To me, seeing a bit of hunting out the gate would be good thing. It would mean the lens focusses quickly.. and the cameras AF could be improved to make it lock focus more reliably in the future.
If the K-3 doesn't hunt, and you're still dealing with a slow focusing lens... how is there going to be improvement? It doesn't make any sense to me to release an "improved lens" that focusses at 1/5th the speed of the competition.