• BirdForum is the net's largest birding community dedicated to wild birds and birding, and is absolutely FREE!

    Register for an account to take part in lively discussions in the forum, post your pictures in the gallery and more.

Search results

  1. colincurry

    1.4x extender query

    I have the same gear and a mk iii 1.4 tc. Apparently, the mk iii is designed for use (inter alia) with the 100-400 mk ii. It will autofocus at f8 with a centre spot and four focus points. I found it quite good for static objects but I also found it difficult to lock on for BIF. This was...
Top