I did a search and nothing conclusive turned up (which doesn't mean there is nothing), so here it goes:I have this teleconverter I used to use it on my 28-300 which canon Tc wont work on. I have tested it on all my lenses the only one it wont fit is my FD lens due to the apature level
I've got a crop body and will buy the 70-300L. The Canon extenders won't work, but there is this Kenko 1.4x that seems to "work ok" and costs half. Does anyone know anything more specific concerning iq and af speed, preferably with a crop body like the 60D?
I would get this TC not as a "always on", but for special occasions when the 1.6x300mm aren't sufficient. However, if the iq is so degraded that it's better to shoot @300mm and then crop, you can help me save money here :-o
IQ is good, wide open it introduces some CA and softens the image a bit but on a sharp lens this isn't too bad
stop it down a stop and IQ is almost back up to par with the base lens with a 300 f4L it you still get AF on all cameras if you have 300 f5.6 you need a 1series. The DGX also reports all info correctly to exif and metering is all correct. It's cheap lightweight and nice to keep in the bag in case you need it