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Canon Extender
Aug 4, 2022 20:14:48   #
Shawags Loc: PNW
 
Is the Tamron SP 150-600mm F/5-6.3 Di VC USD Autofocus Lens for Canon EOS DSLRs compatible with the Canon Extender EF 1.4x III?

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Aug 4, 2022 20:47:06   #
CHG_CANON Loc: the Windy City
 
What camera are you shooting? As your variable-aperture zoom extends, the aperture gets smaller. Even the top Canon DSLRs can't maintain autofocus at smaller then f/8. So, at the 600mm max zoom at f/6.3, you'll have to manually focus with the extender costing you 1-stop light to around f/9.

Then there's the question of whether the lens has room at the rear mount (inside the lens) as the Canon extender literally extends inside the host lens. Only a limited number of Canon lenses are designed with this necessary room to physically connect the extender.

If you haven't bought the extender, consider if that is about to be a waste of time and money.

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Aug 4, 2022 20:50:08   #
Shawags Loc: PNW
 
I am shooting with a 5DMiv

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Aug 4, 2022 20:50:31   #
CHG_CANON Loc: the Windy City
 
Shawags wrote:
I am shooting with a 5DMiv


That's an f/8 camera, as in the minimum requirement is an effective aperture opening of f/8. DSLRs open the lens aperture to the maximum during the focusing, closing to the desired aperture when the shutter is released.

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Aug 4, 2022 20:52:22   #
Shawags Loc: PNW
 
So I’m gathering with my camera being an f/8 camera, I would have to use autofocus with the extender

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Aug 4, 2022 20:54:35   #
CHG_CANON Loc: the Windy City
 
Shawags wrote:
So I’m gathering with my camera being an f/8 camera, I would have to use autofocus with the extender


No, that would be manual focus, for a lens at an effective 840mm. That's a challenging configuration, possibly not even relevant / useful to your photography.

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Aug 4, 2022 22:41:06   #
imagemeister Loc: Stuart, Florida
 
Shawags wrote:
Is the Tamron SP 150-600mm F/5-6.3 Di VC USD Autofocus Lens for Canon EOS DSLRs compatible with the Canon Extender EF 1.4x III?


Especially If this is NOT the G2 version of the Tammy, IMO, your best course of action is to use the lens @500mm and f8 and optimize your native optical IQ with a lower ISO and CROP and use pixel enlargement software for larger printings. A tripod/monopod will be your friend !

And yes, for the most successful wildlife/bird photography, you do NEED 840mm on full frame. A used 80D body might be a better option for you ? ! ....
.

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Aug 5, 2022 07:04:18   #
Jrhoffman75 Loc: Conway, New Hampshire
 
Shawags wrote:
Is the Tamron SP 150-600mm F/5-6.3 Di VC USD Autofocus Lens for Canon EOS DSLRs compatible with the Canon Extender EF 1.4x III?


The Canon telextenders have a projecting “nose” that extends beyond the lens mounting flange. It is only compatible with certain long focal length Canon “L” lenses. It isn’t even compatible with non-L Canon lenses.

Highly unlikely it will work with non-Canon lenses. This is physical compatibility.

As also mentioned there is compatibility with camera AF system to consider.

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