File :-(, x, )
Anonyfag of Borneo !bHymOqU5YY
A question for /p/.

I have been using the focus-and-recompose technique for as long as I can remember. A while ago I read somewhere (probably here) that using that technique on a fast lens will throw it out of focus. Why?

Also, I have started using all of the 400D's nine AF points with my Tamron 17-50mm f/2.8. Is this a good decision to offset the one above?
>> ac !!VPzQAxYPAMA
http://duncandavidson.com/2008/09/focus-and-recompose-exposed.html
>> Anonymous
I used it a lot with my 50mm, until I realised that by changing the distance between the subject & I. even for a few milimeters will screw up the shot.
>> Anonymous
     File :-(, x)
f/16 + focus and recompose = fool proof
>> Anonymous
i knew i was right i was taking pics wide open, focusing and recomposing but my shots were coming out retarded and wondered what i was doing wrong
>> Anonymous
>>268310
Depends on what you mean by "wide open" and how much recompose you're doing.

I F-R with a 24-70 at 2.8 all the time without missing focus, unless I'm trying to do a crazy DOF-blur shot from min focus distance. You've got a bit of leeway if you're careful. OTOH I wouldn't dream of trying that with the 70-200 at 2.8.
>> Anonymous
>>268310
People have habits when they focus-recompose as well. Some people settle back once they recompose. Try focusing on a spot, recompose but keep your finger on focus, them move back to the original spot. See if you're shifting forward or backward accidentally.
>> Anonymous
It is a bad habit done by the lazy and the ignorant.