1.4x for 70-300 ??
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Old 05-01-2018   #1
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Question 1.4x for 70-300 ??

I have a 500D and a 70-300 L tele zoom.
I know a canon 1.4x extender won't work with these, but would a sigma 1.4x ?
Has anyone actually put them all together and produced a picture ?

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Old 05-01-2018   #2
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Default Re: 1.4x for 70-300 ??

I doubt it. The problem you ran into - a 1-stop reduction in the effective f-stop - is common to all 1.4x behind-the-lens teleconverters and even more so with 2x versions, where the reduction is 2 stops.
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Old 05-01-2018   #3
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Default Re: 1.4x for 70-300 ??

The problem was not the 1 stop reduction, but a physical limitation, where the rear element of the lens actually fouled against the front element of the extender. I had been warned of this with the Canon extender, but wondered if the Sigma might be constructed slightly differently.
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Old 05-01-2018   #4
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Default Re: 1.4x for 70-300 ??

If you are talking about a cheap 70-300 mm zoom, results are likely to be so inferior with any teleconverter that you would be better off from an image quality standpoint if you cropped your image to simulate the longer focal length instead. This is even aside from autofocus or mechanical interference questions or, if an adapter is involved, infinity focus questions. Teleconverters are intended to be used with long focal length high-quality prime, i.e., non-zoom, lenses, though some high-quality zoom lenses also work well with teleconverters.
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Old 05-06-2018   #5
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Default Re: 1.4x for 70-300 ??

Quote:
Originally Posted by brocheste View Post
The problem was not the 1 stop reduction, but a physical limitation, where the rear element of the lens actually fouled against the front element of the extender. I had been warned of this with the Canon extender, but wondered if the Sigma might be constructed slightly differently.
Thye physical limitation prevents you to zoom in the 70-300 but if you are only interested in the outer limit (the 300 x 1.4 part), that works with the Canon 1.4x, and is quite sharp too.

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Old 1 Week Ago   #6
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Default Re: 1.4x for 70-300 ??

https://www.the-digital-picture.com/...ns-Review.aspx

The Canon 70-300 L is officially NOT compatible with Canon extenders. This is the only Canon L zoom lens with a widest focal length of 70mm or longer that is not compatible with Canon extenders (as of review time). I've tried mounting Canon extenders to the 70-300 L - and they do not fit. The rear 70-300 L lens element physically hits the front element of the extender.

And what is much more interesting is that the 70-300 L and 1.4x combination's f/8 max aperture combination autofocuses even when mounted to the 60D (and presumably on most/all other Canon EOS bodies). Autofocus speed with the 1.4x extender is very, very slow on all tested bodies, but AF does work - even on the 60D.
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Old 1 Week Ago   #7
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Default Re: 1.4x for 70-300 ??

Yes, you can use the 70-300L with the Canon 1.4x or 2x extenders. It should also work a Kenko or Sigma Teleconverter.


https://www.the-digital-picture.com/...ns-Review.aspx

The Canon 70-300 L is officially NOT compatible with Canon extenders. This is the only Canon L zoom lens with a widest focal length of 70mm or longer that is not compatible with Canon extenders (as of review time). I've tried mounting Canon extenders to the 70-300 L - and they do not fit. The rear 70-300 L lens element physically hits the front element of the extender.

And what is much more interesting is that the 70-300 L and 1.4x combination's f/8 max aperture combination autofocuses even when mounted to the 60D (and presumably on most/all other Canon EOS bodies). Autofocus speed with the 1.4x extender is very, very slow on all tested bodies, but AF does work - even on the 60D.


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