Tele-converter

You can use a converter respite with a 3ti and an ef 70-300 mm f/4-5. 6 usm is lens?

Unfortunately not...  Canon he does not list a compatible goal.

When you use a focal length multiplier, we multiply the focal length (or the range of focal length, so it's a zoom lens) by the multiplier factor of the (usually 1.4 x or 2 x) teleconverter.  But you ALSO have to multiply the focal report of the lens by the same factor.

This means that if you use a teleconverter 1.4 x with a 70-300mm f/4-5. 6 goal then it will become a target of f/5.6 to 8 98 - 420 mm.  The report f / d becomes a problem for the autofocus system.  The AF in the T3i sensors can operate at f/5.6... but not at f/8.  The cameras only autofocus work at f/8 with are the 1 d X, the 5 d III, and... I think the 7 d II also has autofocus work on f/8 (I'm less confident on the 7 d II... maybe someone else can confirm.)

As you have a T3i, the camera will not be able to autofocus, if you use the 70-300 with the 1. 4 x (and the x 2 would be worse... it's f/8-11 and no camera can autofocus above f/8).

If you check the manual for the teleconverters Canon they will list the lenses that work with it.

Tags: Canon Camera

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    Yes, it looks like one of my chipmonks lol

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