• 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. Roy C

    1.4x extender query

    I had some reasonable results with the 300/2.8 IS + 1.4x and 2.0 x giving 840mm at f8 (1344mm fov on my 1.6x cropper) but it was certainly not a combo for everyday use.
  2. Roy C

    1.4x extender query

    You do not need the MkIII 1.4x tc to be able to AF with the 7D2 + 100/400 MkII combo. Centre point plus 4 expansion points are available with the Mk I or MkII 1.4 x extenders. I have tried the combo with both the MkII and MkIII 1.4x extenders and they both work equally well in both AF speed and...