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<blockquote data-quote="hark" data-source="post: 245856" data-attributes="member: 13196"><p>The 70-300mm lens is not a fast lens to begin with, and to use an extension tube with it will cut down the amount of light even further. I *think* that may be causing your problem. You mentioned an 85mm macro lens...generally macros are faster...around f/2.8...so when the light is cut down, there is still enough there for the camera to operate its AF.</p></blockquote><p></p>
[QUOTE="hark, post: 245856, member: 13196"] The 70-300mm lens is not a fast lens to begin with, and to use an extension tube with it will cut down the amount of light even further. I *think* that may be causing your problem. You mentioned an 85mm macro lens...generally macros are faster...around f/2.8...so when the light is cut down, there is still enough there for the camera to operate its AF. [/QUOTE]
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