Tamron 17-50mm F2.8

[poyol]

What body are you using??
I have the same problem when mounting the lens to my friends Canon 60D but it works fine with my own 550D. Perhaps is has to do with the previous lens ID issue with 60D, 7D series?

I'm using it on a 50D.. the problem seems to have gone away now though..
I did some micro adjustment on the AF and now it will focus whenever I want it to....

[msahharudin]

I'm using it on a 50D.. the problem seems to have gone away now though..
I did some micro adjustment on the AF and now it will focus whenever I want it to....

bro, mind to share more....

[poyol]

bro, mind to share more....

Erm.. I'll try to explain the best I can...

certain canon EOS bodies such as the 50D have this function called "AF Micro Adjustment".

Basically with this function, you are able to adjust the AF of every individual lens that you have. This function is to fix front/back focus issues.

I figured that my lens was having some front/back focus issue (apparently most Tamrons do), so.. I took some time to make a few test shots, adjusting the AF bit by bit, until it was dead centered (to me at least..lol)

This solved my focusing problem (lens wouldn't focus eventhough there was a focus confirmation beep)

Actually.. I also cleaned the contacts on the lens mount. MAYBE that solved my AF issue...

In low-light however.. it still hunts..which is normal for this lens.

[avdore]

Erm.. I'll try to explain the best I can...

certain canon EOS bodies such as the 50D have this function called "AF Micro Adjustment".

Basically with this function, you are able to adjust the AF of every individual lens that you have. This function is to fix front/back focus issues.

I figured that my lens was having some front/back focus issue (apparently most Tamrons do), so.. I took some time to make a few test shots, adjusting the AF bit by bit, until it was dead centered (to me at least..lol)

This solved my focusing problem (lens wouldn't focus eventhough there was a focus confirmation beep)

Actually.. I also cleaned the contacts on the lens mount. MAYBE that solved my AF issue...

In low-light however.. it still hunts..which is normal for this lens.

Sorry but i still dont understand this "AF Mirco Ajustment". Can you show us how u do the setting to ajust ur AF bit by bit. TQ bro!

[poyol]

try this http://www.dgrin.com/showthread.php?t=116078

hope that helps

[MYlover]

its a sharp lens dude