I know this forum has loads of threads on the focusing issues. And I having had a K10d and now recently moved to a K20d am an expert in how to measure these issues using Focus Charts etc...
I sent back my k20d and just received a replacement as it was seriously front focusing. (using my 50mm @f1.4)
Now my replacement has the same problem, and I can't believe this is just bad luck. I am really fed up of the whole Pentax experience.!
Anyway...so I've checked my technique. 45 degree angle, good shutter speed, focus chart is flat, just focusing on the black line etc...but still the same problem.
So the other thing I thought about was the lighting. I was always doing my tests in my study in the evening after work in tungsten lighting.
After several googles on SAFOX and Tungsten lighting it appears that it does front focus under this colour temperature.
This weekend I will recheck doing the tests in daylight...however it leaves a dilemma. Does this mean you can never guarantee a good focus indoors under tungsten???
My question to the forum..is if I put a colour correction filter on the lens for indoor shooting..would that fix it?..or is it todo with the frequency of the light?
Any feedback on these thoughts would be great.
Paul
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