Originally posted by fs999 Yes, the extension tube passes the AF, even SDM, but I don't use AF often in macro because it changes the magnification. Sometimes I use two or three extension tubes together...
Here a rapid comparison :
FF mode • Pentax FA* 85mm F1.4 (IF) SE • 100 ISO • F22 • Av mode
Thanks Frederic, that is helpful. I didn't consider the focus breathing. I didn't notice on my rig because I would just set min focus and use CIF and lean in until the shutter tripped with the manual focus lens I was playing with. You risk motion blur doing that way with catch in focus, but not at the shutter speeds I was using, and you have to lean in veerrrrry slowly, heh.
Once the shutter trips, you can freeze and take a second "safety shot" that will have no motion to worry about. It seemed to work fine for me.
Eric