The 300mm f4 M series lens is rather rare.
The 300mm f4 A lens is identical and more available..
I often take the 300/4 A with the AF1.7X on trips.
It makes a sharp and small birding combo.
Regards,  Bob S.

On Fri, Sep 21, 2012 at 10:00 AM, Collin Brendemuehl
<[email protected]> wrote:
> http://evangelicalperspective.blogspot.com/2012/09/perspectives-on-tokina-at-x-40056-af-v.html
>
> Not a thorough comparison, but enough to display strong points of both.
>
> Sincerely,
>
> Collin Brendemuehl
> "He is no fool who gives what he cannot keep to gain what he cannot lose"
> -- Jim Elliott
>
>
>
>
>
>
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