Originally posted by pexley I just plunged into the DSLR world from a Panasonic fz8 so bear with me. I suspected some focusing issues with the 18-55mm kit lens with my new k-x so I printed out a test chart and followed the instructions for conducted a controlled focus test (camera mounted to tripod with MLU enabled). Below is the result. Back focus problem? Should I send the camera back to Newegg? I'm running out of my 30 day window in just a few days.
Attachment 49573 BF/FF = sad reality of PDAF in dSLR... use the undocumented Debug Mode feature to correct that... because it can happen w/ another Kx body and another lens... or you can send Kx and lens to Pentax (is it sill up to 4 lens if tuning done by Pentax Service Center) and they should be able to fix the issue for your specific body/lens combo
PS: what I really do not understand is why Pentax does not provide an option to do an automatic BF/FF correction now that we have CDAF available too ? it seems so easy to implement - put a camera on a tripod w/ some high contrast target suitable for both PDAF and CDAF focusing, select some item in the camera menu and camera will do PFAF focusing on a target, raise the mirror, do CDAF focusing, lower the mirror, do PDAF focusing again - record the necessary correction for PDAF in camera's memory... that can be done even w/o tripod - just put a camera on some solid surface... and that option can be provided along w/ the option to enter manual corrections if you do not wish to use the automated procedure... come on Pentax, somebody kick their firmware engineers in Japan finally !