I may have mentioned this before, but I picked up two new lenses for my pending trip to Ireland:

• Canon Zoom Telephoto EF 70-200mm f/4L USM Autofocus
• Tokina Zoom Super Wide Angle AF 12-24mm f/4 AT-X 124AF Pro DX Autofocus

I decided today, the day before I leave, to do some focus testing. Great timing, since I can’t do anything if the lenses turn out to be miscalibrated! Here are the results:

Tokina @ 12mm

Result: Moderate back focus. My untrained eye shows that the rear 6mm mark is truly in focus.

Tokina @ 24mm

Result: Very slight front focus. While the entire area in focus is actually a bit soft, the near 20mm is in better focus than the far 20mm.

Canon @ 70mm

Result: Focus seems to be dead on.

Canon @ 200mm

Result: Moderate back focus. My untrained eye shows that the rear 6mm mark is truly in focus.<