i use these EMF af chips.
(http://www.ebay.com/itm/EMF-AF-confirm-M42-lens-to-canon-adapter-eos-5D-1000D-/220677929027?pt=US_Lens_Adapters_Mounts_Tubes&hash=item33616df843)
great thing is that you can make Focus micro-adjustment,
not so great is that you have to do a loot of photos to calibrate this chip ( min 9 pictures for 1 calibration)
my question would be
how to calibrate without making actual picture, perhaps with fake pictures ??
(http://www.ebay.com/itm/EMF-AF-confirm-M42-lens-to-canon-adapter-eos-5D-1000D-/220677929027?pt=US_Lens_Adapters_Mounts_Tubes&hash=item33616df843)
great thing is that you can make Focus micro-adjustment,
not so great is that you have to do a loot of photos to calibrate this chip ( min 9 pictures for 1 calibration)
my question would be
how to calibrate without making actual picture, perhaps with fake pictures ??