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02/26/2007 04:40:20 PM · #1 |
What would happen if I used a Canon 1.4 tele-extender on a lens that is not compatible?
Do I just lose autofocus or would something really bad happen ;-)
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02/26/2007 04:45:52 PM · #2 |
| On most, if not all of the incompatible lenses, you won't even be able to mount the converter. It will mechanically interfere with the lens. The front element of the converter sticks out past the mount, and will hit the rear element of these lenses. |
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02/26/2007 04:46:31 PM · #3 |
...nevrmind.
Message edited by author 2007-02-26 16:47:00. |
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02/26/2007 04:48:13 PM · #4 |
| What Kirbic said. The two parts will not physically fit together. |
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02/26/2007 05:55:04 PM · #5 |
Most of them you can mount with an extension tube. You lose infinity focus but get closer focus.
E.g., I use my 1.4x teleconverter with my 100mm f2.8 macro all the time. A short extension tube is enough to mechanically house the projecting part of the teleconverter and let you mount pretty much any lens.
Not all lenses will focus though, as you've shifted the potential areas of convergence. In some cases, these never line up with the sensor plane.
Most any lens can be mounted this way.
Message edited by author 2007-02-26 17:55:26. |
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02/26/2007 07:56:22 PM · #6 |
| Thank you...I wanted to try my 100mm f/2.8 with the 1.4x and just did not want to ruin something electronically in case this was a bad thing to do. |
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02/26/2007 07:58:18 PM · #7 |
Follow the general Mechanic's Rule on this one
If it don't fit, FORCE IT.
If it breaks, It needed to be replaced anyways.
On a serious note just don't force anything. |
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02/26/2007 08:02:57 PM · #8 |
Originally posted by slickchik:
Thank you...I wanted to try my 100mm f/2.8 with the 1.4x and just did not want to ruin something electronically in case this was a bad thing to do. |
This you can do, for macro work. Mount a 12mm (or longer) extension tube to the back of the 100/2.8. Now mount the converter to that assembly. Last, mount the entire thing to the camera.
With a 12mm tube, you'll get about 1.5:1 magnification at closest focus. You lose just over 1 stop, which is pretty much no impact since you'll be shooting stopped way down anyway.
FWIW, using AF with this combination is next to useless, but as long as the extension tube is the "auto" type, you in theory will have AF. |
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