Quote:
Originally Posted by nick_gray
I could only find the one Sigma 50-500 on the WEX site (Sigma 50-500mm f4.5-6.3 DG OS HSM - Canon Fit), so I assume this is the newer of the two you mentioned. This is the one with only 2 reviews (both good), that I linked to in my post.
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That's the one
Quote:
Originally Posted by nick_gray
Thanks for the info, Markulous,
However, Kenko does not recommend them for zoom lenses that have a range starting under 50 mm. Please note: Kenko teleconverters are not compatible with Canon EF-S lenses."
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Only problem is any lens that has anything protruding back from the mount into the camera. Certainly my 15-85 EF-S lens does, so it won't fit (but I can't think why I want to use it on that lens!). I've used it with my 150-500, 500, 300, 105, 150.
Quote:
Originally Posted by nick_gray
What's the pin tape trick?
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You tape up 2 of the electrical contacts on the TC so that camera isn't aware there's a TC attached. Aperture control and AF work normally but EXIF will not show presence of TC. I can take a photo of mine if anyone wants more info.
BTW, this works with the Canon mk II TCs but not sure about mk IIIs
Of course, with a stop of light less, camera will hunt for focus more - using a 2x TC I imagine on a f/5.6 it must be near impossible to AF in less than very bright conditions