Jay D. Washington wrote:
Canon advises against "Focus lock and recompose" (FLR) on page 11 of this article: http://www.photoworkshop.com/canon/EOS_Digital.pdf
Sincerely Julian Loke
"FLR is sufficiently accurate for photographing distant subjects, but it can cause focusing errors, especially backfocus, when photographing subjects within about 15 feet of the camera. This is often the case during portraiture. For optimum focusing performance with close subjects, we recommend avoiding the FLR technique. Instead, use an offcenter focusing point or focus manually."
Any idea why FLR should result in backfocus? "Backfocus" from my understanding is when the focus tends to be slightly further than the subject is at. I would think that if anything with FLR, objects closer would be more likely in focus since the distance to the subject is increased (but only ever so slightly) by moving them away from the center of the composition.
Hi
Talk about timing, I was just reading about this problem...
FLR will only work properly at close distances if the subject and "item used for focusing" are exactly the same distance from the camera (film/sensor plane actually). The problem is more noticable during portrait work because of the closeness of the subject and shallow depth of field.
Rob www.rcp.ca
* **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
