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<blockquote data-quote="Billy Y." data-source="post: 75134" data-attributes="member: 10157"><p>I have the TC 17E II, I was suprised that it does meter and autofocus on my 70-200 VR I - and I can get some fairly sharp images from it, but it still isn't anywhere near enough reach.&nbsp; I wonder how the 1.7 does on the 300, that would be a goood amount of reach especially in DX mode.&nbsp; Once you got used to tracking in the smaller View finder area.&nbsp; One interesting thing a read about the 800 and tracking birds or sports in DX mode (I think it was at Ken Rockwell) is you can put it on Auto focus tracking and those 51 points fill almost the entire DX area - Ken was saying it works so well he was getting almost no throw away images because of sharpness.&nbsp; His point was that the auto focus tracking between the 51 points was much quicker and better than trying to pick a point and keep that point on the bird in flight.&nbsp; I haven't tried it yet but in theory I can see what he is saying.</p></blockquote><p></p>

[QUOTE="Billy Y., post: 75134, member: 10157"] I have the TC 17E II, I was suprised that it does meter and autofocus on my 70-200 VR I - and I can get some fairly sharp images from it, but it still isn't anywhere near enough reach. I wonder how the 1.7 does on the 300, that would be a goood amount of reach especially in DX mode. Once you got used to tracking in the smaller View finder area. One interesting thing a read about the 800 and tracking birds or sports in DX mode (I think it was at Ken Rockwell) is you can put it on Auto focus tracking and those 51 points fill almost the entire DX area - Ken was saying it works so well he was getting almost no throw away images because of sharpness. His point was that the auto focus tracking between the 51 points was much quicker and better than trying to pick a point and keep that point on the bird in flight. I haven't tried it yet but in theory I can see what he is saying. [/QUOTE]

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