The Canon 2x convertor won't allow autofocus on the 300f4 without taping a contact. Other brand 2x convertors don't have this limitation, but they all focus slowly with that lens. In my opinion, not worth the extra reach -- stick with the 1.4X or bare lens.
Jim
The Canon 2x convertor won't allow autofocus on the 300f4 without taping a contact. Other brand 2x convertors don't have this limitation, but they all focus slowly with that lens.
I have yet to hear of anybody getting good results with the x2 on a 300mm f4.
I don`t personally think that 300mm is long enough to consider cropping.
As my brother will attest get a Kenko 1.4x in addition to your Canon 1.4x and stack them for when you want to try some extra reach. They'll retain AF (should retain IS too I think) but how well it locks on I cannot answer but obviously good light is a must. Just make sure your not trying to do too much with it, heavy crops will not look good.
Regards.
As my brother will attest get a Kenko 1.4x in addition to your Canon 1.4x and stack them for when you want to try some extra reach. They'll retain AF (should retain IS too I think) but how well it locks on I cannot answer but obviously good light is a must. Just make sure your not trying to do too much with it, heavy crops will not look good.
Regards.