gavin martin Posted October 14, 2004 Share Posted October 14, 2004 Hi all. I recently tried a canon 24-70mm L lens (new and fresh from the box) on my 10d in a local shop. Whilst the lens is a little on the heavy side the quality is obviously worthwhile. The issue I found is that it didn't have a great time findin focus. When it did focus it was lightning quick but on many occasions it could not focus on objects 5-10 metres away. The guys in the store (a pro shop, not consumer), along with myself, were rather suprised by this to say the least! Has anyone else found this issue with the 24-70L and a 10d? Many thanks Gavin Link to comment Share on other sites More sharing options...
rob_davidson Posted October 14, 2004 Share Posted October 14, 2004 I don't have any first hand experience but I've heard of a few people having similar problems with this combination. Rob Link to comment Share on other sites More sharing options...
yakim_peled1 Posted October 14, 2004 Share Posted October 14, 2004 Try a different 24-70 lens on the same body. Try the same lens on a different body. Report back in 30 seconds. Move! :-) Happy shooting , Yakim. Link to comment Share on other sites More sharing options...
kinesisphotogear Posted October 14, 2004 Share Posted October 14, 2004 I have the D60 and this lens. I have had repeated back focus problems. I sent both into Canon (along with a CD containing files illustrating my point) to recalibrate -- NO change. My 70-200/2.8 works fine on this body. I have read in other forums about this same problem with the Mark II and the 24-70. Link to comment Share on other sites More sharing options...
digitmstr Posted October 14, 2004 Share Posted October 14, 2004 what position is the zoom when the issue occurs? I have that combo and I have never experienced any such behavior, even at night. I can count the AF "hunting" episodes on one hand...and I have had that combo for over a year. It could be a contrast issue at the wide setting: if there are objects of similar contrast the camera has no way of knowing which one you want to lock on. At the wide end, teh AF point (which is larger than the box you see to begin with) covers a sizeable area. Link to comment Share on other sites More sharing options...
Rob_L1664876404 Posted October 15, 2004 Share Posted October 15, 2004 Gavin, I have used the EF 24-70 F/2.8L on a 300D (Digital Rebel) for more than a year and, more recently, on a new 20D. I've never had a problem with the auto focus on either of these cameras (and I do a lot of very-low-light shooting). I can think of two other possibilities to investigate: 1) the 300D and 10D are known for having more advanced AF systems than the 10D - could it be the camera? 2) could the lens you tried have been a lemon? Are there other 24-70's available to try? Link to comment Share on other sites More sharing options...
charlie_vigue Posted October 15, 2004 Share Posted October 15, 2004 The focus/recompose method will often cause backfocus on shorter focal length lenses. It's simple trig. Try selecting the correct focus sensor instead. Link to comment Share on other sites More sharing options...
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