I was playing around with my smc FA 20mm lens and tried using the AF 1.7x converter with it. Normally the minimum focus distance is 0.25m
then I was thinking about trying something a little different with the lens today , so I pulled out the Pentax F 1.7x teleconverter and noticed that the close focusing distance was even closer than normal. I tried a little experiment at lunchtime
smc FA 20mm at MFD
smc FA 20mm at MFD with 1.7 AF converter from same position of the camera
Then I tried moving the camera and lens forward to the closest distance I could with the combo
This brought the MFD down to about 0.1m
I guess that not only is the 1.7 converter able to use a little of it's own autofocusing range to focus a little closer than normal, however the extra range seems to be more than the AF range in the converter, I guess that the converter is also acting a little like an extension tube as well making it more into a macro type of situation, any thoughts?