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<blockquote data-quote="Vincent" data-source="post: 508434" data-attributes="member: 15675">One of the topics I would like to add to the discussion is keeper rates.For the beginners, a good picture is generally accompanied with a series of bad pictures (certainly with birds in flight, BIF).It is not abnormal to take 30-50 pictures to have one you really like (sharpness, composition, etc... all work together), that would be a low keeper rate.For example my BIF keeper rate with the 600mm f4 seems a lot higher (1 keeper out of 4) then with the 70-200mm f2.8 VRII (1 keeper out of 20) which is higher then with the 70-300mm f4-5.6G. It is not only linked with the technology of the lens, but also with the user. The 70-200 I support better then the 70-300, because I have to. The 600mm is always on the best tripod, adding to the keeper rate. On the other hand I take a lot more daring shots with the 70-300mm since I can move it around more easily. An other issue with keeper rates is that the science seems to be missing, I have seen few installations for AF + VR tests in panning shorts where no human intervention is required.</blockquote>

[QUOTE="Vincent, post: 508434, member: 15675"] One of the topics I would like to add to the discussion is keeper rates. For the beginners, a good picture is generally accompanied with a series of bad pictures (certainly with birds in flight, BIF). It is not abnormal to take 30-50 pictures to have one you really like (sharpness, composition, etc... all work together), that would be a low keeper rate. For example my BIF keeper rate with the 600mm f4 seems a lot higher (1 keeper out of 4) then with the 70-200mm f2.8 VRII (1 keeper out of 20) which is higher then with the 70-300mm f4-5.6G. It is not only linked with the technology of the lens, but also with the user. The 70-200 I support better then the 70-300, because I have to. The 600mm is always on the best tripod, adding to the keeper rate. On the other hand I take a lot more daring shots with the 70-300mm since I can move it around more easily. An other issue with keeper rates is that the science seems to be missing, I have seen few installations for AF + VR tests in panning shorts where no human intervention is required. [/QUOTE]

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