Some quick questions re Kenko TCs, the pro 300 range I think
Can you stack kenko TCs, I understand this is not advisable, for a number of reasons.
If so, I assume the light loss is additive so how many of these could you stack say on an f/2.8 before it would not work due to light loss, (forget image quality)
Does anybody have a definitive list of which Canon lenses these thing work with, I understand that they recommend not to be used on a lens below 50mm, because of extreme vignetting, but I want to know if you can put these things on a wide or ultrawide lens and not damage it.
Also understand or believe that they only work on EF, is this because you will damage either both if you connect them to and EF-S or again vignetting or the image will only get to part of the sensor?
All of this is theoretical, and I know a lot of the arguments for and angainst TCs, but I become frustrated trying to find an answer to this, and so thought I would come to the wise people here and see what sort of response I would get.
I have googled the #*^%& out of kenko TCs and all sorts of things and haven't been able to find out.