I decided to try out the (new to me) 300/4 yesterday. Most were handheld, a few were on my tripod being used as a make shift monopod (note to self: make sure the replacement is in stock before seliing the one you have:redface
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And with TC14e:
So far, the lens looks like a winner. Sharp, fast to focus and easy to walk around with.

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And with TC14e:

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So far, the lens looks like a winner. Sharp, fast to focus and easy to walk around with.