Quote:
Originally Posted by OldBoy
Can't understand why you need to tape the Kenko converter with the 7D to obtain auto focus with that lens? I've used the Nikon 300 F4 with the Nikon D200 plus 2x converter in full auto focus at F8.  |
Nor can I!
It's a manufacturer thing (as in Canon) - concensus is that they deliberately prevent AF so that it cuts down on focus "hunting" which could, in theory, stress the AF motor and/or lead to people complaining about poor focus and AF
Quote:
Originally Posted by OldBoy
I'm trying to point out to the original poster that he may be very disappointed when trying to use a teleconverter with the 70-300mm F4-5.6 lens and the Sony Alpha 550 camera. Some lenses that are rated as F5.6 are really F6.3 but to get auto-focus have to tell the camera they are F5.6.  |
Disappointed maybe but you actually said that it was impossible! State the problems by all means (and let people make up their own minds) but it's somewhat patronising to make the decision for them by giving misleading info