Originally posted by Smeggypants if you focussed on the centre of the coin then that's definite front focussing. You should have slightly for DOF behind the coin.
I agree. I need to go to 2.8 to get the entire coin in focus (still slight forward focus there but both sides of coin is in focus).
I also have to qualify this by type of lens. It seems my FA50 is my best. In subsequent testing I learned my DA40 is significant FF at low EV. Same with my DA*50-135. The FA 100 macro is somewhere in the middle.
When I do the test with florescent light I get the same results as tungsten.
My K20D,
if it can find focus, provides better focus results.
But for me (flame off, I'm just talking about my experience here) I don't shoot in this low of light that often so its not as much an issue as it is for others. And of course I think it should be corrected. I also learned that if I do, I'm going to do it with my FA50 which gives me the best focus. Perhaps helpful if you know which lens is going to do what if you shoot in low light.