do teleconverters work on ef-s lenses

saxk

saxk

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Brad 'Electron-Don' Foster
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do teleconverters work on ef-s lenses, like my 55-250mm ? jsut out of interest.
 
The Canon teleconverters are expensive (£225 for a 1.4X) and fit only a limited range of canon's own EF lenses. The Kenko Pro 300 DG teleconverters are significantly cheaper (£100), offer very similar IQ and fit, as far as I know, all of Canon's EF lenses. I doubt that any teleconvrter will work with EF-S lenses due to the short backfocus design which means that the back of the lens extends into the camera body. If you stick a teleconverter, which is full of glass, in the way I suspect there will be a very real physical problem.

Don't forget that when you add a teleconverter to an f/5.6 lens you will lose AF on a 30D or any xxD camera. You can tape over some pins on the teleconverter to mask the teleconverter from the camera so it attempts to AF but the results may not be very good.
 
The EF-S mount will protude too far to physically fit the T/C to the lens. If you're not unduly worried about long distance focus then you'd have some possibilities by mounting a short (12mm) tube between the T/C and the lens....may be useful to get garden birds framed a little better if they're within 5-10m of you (I don't know the exact maximum focus distance in this configuration).

Bob
 
A cunning plan, Bob, but not all macro tubes are EF-S compatible. My Kenko set isn't. Some are though, so worth checking out.
 
so thats a no then, thanks guys.

and its not for macro stuff really, i was jsut wondering if i could extend my range at all.
 
saxk said:
....and its not for macro stuff really, i was jsut wondering if i could extend my range at all.
Click to expand...

I wasn't suggesting you use it for macro, just that a tube would allow you to mount the T/C. You'd lose the ability to focus at infinity but I believe that you'd still be able to shoot birds within the bounds of an average garden.
I put tubes behind my 600/4 if the birds get too close for minimum focus but it's not macro.

Someone out there probably has a 1.4x and a 12mm tube to get a more accurate idea of where the infinity focus plane lies.

Bob
 
Sorry for the bump but I had the same question and wanted to see if the situation had changed.

Are there any teleconverters that would work on a 400D or is there no chance?
 
Teleconverter will work on your 400d body, it is the lens you are attaching which will have to be an EF lens and not EF-S as stated earlier in the thread.
 
WillieL said:
Teleconverter will work on your 400d body, it is the lens you are attaching which will have to be an EF lens and not EF-S as stated earlier in the thread.
Click to expand...

And to retain proper (or any) AF function the lens must be f/4 or faster to fit a 1.4X and it must be f/2.8 or faster to fit a 2X. An f/5.6 or slower lens will not AF if you fit a teleconverter.
 
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