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Canon EF Extender (teleconerter)

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    stevew10000
    stevew10000 e2 Member 258 forum postsstevew10000 vcard United Kingdom
    28 Jul 2012 - 10:55 AM

    sorry for asking what is probably a dumb question...

    the images i have seen of the 1.4extender seem to show the central lens element extending beyond the front of the barrel/body by quite a significant amount. What stops it coming into contact with the rear lens element of the lens it is fastened to? I have a 70-200 f4l and thinking about the 1.4 extender.

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    Sabreur
    Sabreur  8767 forum posts England
    28 Jul 2012 - 11:16 AM

    It only works with certain Canon L lenses which don't allow the two lens elements to touch. There is a compatability list on the Canon site.

    rogerfry
    rogerfry e2 Member 8495 forum postsrogerfry vcard United Kingdom
    28 Jul 2012 - 11:24 AM

    Your lens is ok with the converter.

    (Don't try and use it with any lens not on the list).

    Last Modified By rogerfry at 28 Jul 2012 - 11:25 AM
    stevew10000
    stevew10000 e2 Member 258 forum postsstevew10000 vcard United Kingdom
    28 Jul 2012 - 11:40 AM

    thanks guys, thats really helpful.

    Steve

    tomcat
    tomcat e2 Member 85748 forum poststomcat vcard United Kingdom15 Constructive Critique Points
    29 Jul 2012 - 8:44 PM

    I was going to say, to be careful about AF, but the f/4 should be OK, I think?

    chris.maddock
    29 Jul 2012 - 8:50 PM


    Quote: I was going to say, to be careful about AF, but the f/4 should be OK, I think?

    Provided it fits (*), it'll work fine.

    (*) I assume that it will, my Mk1 did, can't imagine that the later models will have dropped the extender compatibility.

    stevew10000
    stevew10000 e2 Member 258 forum postsstevew10000 vcard United Kingdom
    29 Jul 2012 - 8:52 PM

    Thanks.

    Slightly different q? Forget the extender sell the 70 200 and get the 70 300l with added benefit of IS? Or go for the 1.4?

    Any suggestions/advice?

    NeilS
    NeilS e2 Member 7801 forum postsNeilS vcard United Kingdom
    30 Jul 2012 - 6:07 PM

    70-300l is a magic compact L zoom, I use one as a walk about lens, and I am usually quite amazed what you can capture panning and wafting in good light

    Its an interesting lens that Canon has provided, as its designed by them not to fit a Canon teleconverter, which is bad news for Canon because everyone then buys the Kenko DGX, which I have to admit works quite well it

    Its size, weight, IS and AF, IQ and zoom are all plus factors, the only two negatives are its f5.6 at the long end and the not included Canon Tripod collar costs a kidney, however I use a 10 knock off jobby from the far east, its the same size collar that fits the 28-300L, and I have had no issues

    Below is is an image captured recently with it, I have tried to replicate and get a better shots with my 300L 2.8 prime and failed, and I am still fit enough to waft that about quite efficiently

    cheddar-caveman

    One of the most important thing to remember when using any of the extenders is that AF can be affected. The 1.4X will up your lens f stop one stop - an f4 will become an f5.6 and this is highest f stop where AF will work.

    I use the 1.4X with my 300mm f4 prime (becomes a 420mm f5.6) and get good AF.
    Likewise I can use the 2X with my 300mm f2.8 (and it becomes a 600mm f5.6) and still get good AF.

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