Kenko extension won!t work {canon eos}
Oct 11, 2017 20:04:06 #
I endorse what thomas902 said, but it would be cheaper to pickup a 50mm prime to use with your extension tubes
Oct 12, 2017 22:18:38 #
Oct 13, 2017 21:17:35 #
amfoto1
Loc: San Jose, Calif. USA
mwsilvers wrote:
One reason to go with the more expensive Canon version is build and fit, epecialliy important If being used with a lens a bit on the heavy side. I've read a few comparitive reviews that indicated the Kenko connection to the camera and lens was not as rigid as with the Canon extensions. I have a Canon 12mm extension tube which I primarily use with the 35mm f/2 IS USM lens. The combo attached to my 7D Mark II is absolutely rigid.
I have three Canon extension tubes and a Kenko tube set... they're virtually identical in build quality, materials and function. If it weren't for the brand name printed on them, you'd have a hard time telling me which was which.
Other brands such as Zeikos, Opteka, etc. are more plasticky and lighter built. Especially the "economy" versions with plastic bayonets, I'd worry about using them with a heavier lens.
OP, I have no idea why you are having trouble with your Kenko tubes. I've used them with everything from 20mm to 500mm Canon primes, as well as 70-200mm zoom. No problems what-so-ever.
Canon EF 20mm f/2.8 lens with 12mm extension tube:
Canon EF 50mm f/1.4 lens with 20mm extension tube:
Canon EF 85mm f/1.8 lens with 20mm extension tube:
Tamron SP 90mm f/2.5 lens with 20mm extension tube:
Canon EF 70-200mm f/2.8 lens with 25mm extension tube:
Canon EF 300mm f/2.8 lens with 25mm extension tube:
Canon EF 500mm f/4 lens with 36mm extension tube:
If you just bought a new set of Kenko tubes, they are likely compatible with both EF and EF-S lenses. If they are marked "For C/AFs" they will work with your EF-S 55-250mm or any other EF-S lens, as well as any EF lens. If they are marked "C/AF" (no small "s"), only EF lenses can be mounted on them. But that would be an old set. The C/AFs type superseded them some years ago.
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