Originally posted by betaPhoto Can your K-5 focus accurately with the following parameters:
* EV2 & EV3 area (as well as EV 8 or so for accuracy comparison) (EV1-EV4 is sighted as the main trouble).
* The focus distance should be between 2 and 5 feet (.5-1.5 meters) where the problem is quite pronounced.
* The f-stop should be f2.0 to f2.8.
If it can, show people some shots of it. End the hysteria by showing the K-5 can be capable of low light focus accuracy!
I've just spent the whole week doing tests just like this (I'm on sick leave, so I have plenty of time to kill!)...
With my FA50/1.4, my K5 focuses quite well until EV1. Below that, it's hit & miss and it will really lock on contrasty edges only, right until EV-1 (but it often ends up with a blinking hexagon instead of a FF).
At the start I noticed FF in low-light situations, but after a careful fine-tuning of my lenses, and the v1.02.21.10 upgrade (don't know if it has an effect!), I can't see it anymore. I disabled the AF assist lamp too, as I found it really disturbing for my subjects, so maybe it has an effect too.