Originally posted by Fredooo I have my K 1 with the 100 mmDFA macro WR and the diffraction appears beyond f/9,if i use an converter what could happen ,anyone has tried?
Diffraction really depends on the size you view it at. So what size are you printing to?
In general if you see diffraction at f/9, when you put the converter on you'll still see it at f/9 - note this will not be the same size opening as without the TC. If the lens had an aperture ring it would not be on f/9 - this will be f/9 after the TC adds it's stop. Luckily the camera takes this into account so f/9 is really f/9 with or without the converter. Your Mileage May Vary as far as diffraction...