extenders

[BraCas]

just asking, can you exchange teleconverters between Tamrons and canon lens?? I mean..do you have to use a canon on a canon lens and visa versa.

thanks

 

[ruifo]

For Nikon, yes you can, if they are the Nikon mount.
Not sure for Canon. Probably yes...

 

[Gavjenks]

Canon teleconverters must be used with lenses that have a bit of a hollow space in the back near the mount. The teleconverter glass sort of sticks out a little bit, and if the lens also has glass going right up to the mount (when zoomed out and far focused), then the two will crash into each other and probably damage both.

That's why canon only tells you to use it with certain lenses, ones which were built with enough empty space in the back of the lens to not crash together. However, there are other lenses that have enough room in back just coincidentally, that can be used. If your lens when zoomed out and far focused has a gap between the mount and the rear element it may work. You can test it by gently laying a thin piece of clean soft sponge or something on top of the teleconverter glass, then zoom out the lens and focus near, and slowly gently attach, aborting if you feel any resistance at all. Then very slowly zoom out and focus far, again feeling for any resistance etc.

Or, safer, just search online and see if anybody out there successfully used that lens with a teleconverter =P

 

[Overread]

Teleconverters all have a protruding front element that, as said above, physically restricts what lenses they can fit to. However so long as the rear of the lens has enough room both depth and width wise then any EOS mount teleconverter will fit to an EOS mount lens. As a result you can certainly use Sigma or Kenko Pro series teleconverters on your normal Canon lenses.

Canon's teleconverters have the biggest front protrusion - then comes Sigma which area little smaller - then Kenko Pro which have the smallest.

Always check up to make sure the lens you have will fit the teleconverters before you purchase - note that typically you'll find its 100mm or longer lenses that people use and that fit to teleconverters. Some shorter lenses can fit teleconverters; but not a huge number.
Also note that the official compatible lists don't always list everything that can work. Sigma's 70mm macro can mount sigma brand teleconverters - whilst Canon's MPE 65mm macro can fit them as well.

Note Kenko has a pro series and lower standard series of teleconverters - whilst the pro-series cost more they are vastly superior to the others and I'd advice only getting pro-series makes.