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Title: Canon EF 70-300 Lens - Jumpy Post by: dgaver on September 16, 2010, 02:13:08 PM I am new to digital photography and purchased a Canon EF 70-300/4-5.6 IS USM telephoto lens for a EOS 7d.
When I push the shutter button down approximately 1/2 way the lens will sometimes struggle for focus, it seems to jump around. If I push the shutter button down a bit further it seems to work. Is this typical of this lense or did I get a defective lense. The other lens that I have does not do this, kit lense 28-135. Thanks for the help. Title: Re: Canon EF 70-300 Lens - Jumpy Post by: KeithB on September 16, 2010, 03:25:05 PM Is it the focus that is jumpy or the IS? In bright light I have not seen any focus issues, it does tend to hunt a bit in dim light though. The IS is jumpier on my 17-85 than my 70-300.
Title: Re: Canon EF 70-300 Lens - Jumpy Post by: jamisan on September 17, 2010, 11:26:57 AM mine does that sometimes mostly it is just "hunting" for a focus. you might want to check where your auto focus points are set. also you need to remember the min focus on that lens is around 4 feet
Title: Re: Canon EF 70-300 Lens - Jumpy Post by: dgaver on September 17, 2010, 12:29:23 PM Thanks for the responses. Keith, it is the focus that is doing this. It was in a low light situation (high school football game, under the lights).
Title: Re: Canon EF 70-300 Lens - Jumpy Post by: KeithB on September 17, 2010, 02:05:51 PM For those kind of situations it might be best to lock focus to the center point to make sure you are focusing on something.
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