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  1. #1
    Join Date
    Mar 2005
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    Why No EF-S Compatible Tele Extender?

    Does anyone know why this wouldn't be technically possible? Seems like a slam dunk idea. I'm surprised a third party like Kenko hasn't stepped up...
    Some Gear: Nikon D700; Nikkor AF-S 50 f/1.4 G; Nikkor AF-S 24-85 3.f/5-4.5 G ED; Tamron 28-300 f/3.5-6.3 VC; Nikon SB-800; Velbon Maxi-F; Canon Pixma Pro 9000; Canon S3IS, Canon SD500; Epson 4990; Epson P5000; Wacom Intuos 3

    Main Software: Capture NX2; Adobe PhotoShop CS2; Corel Paintshop Pro X2 Ultimate

    Sold: Canon XT/350D, EF 24-105mm f/4 L IS, EF 100mm f/2.8 Macro; EF-S 10-22mm f/3.5-4.5, Sigma 18-200 OS; Canon ET EF 25II; Kenko Pro 300 DG, Canon 430EX, Canon BG-E3.

  2. #2
    Join Date
    Oct 2005
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    1,770
    Quote Originally Posted by JTL
    Does anyone know why this wouldn't be technically possible? Seems like a slam dunk idea. I'm surprised a third party like Kenko hasn't stepped up...
    With IS! (As someone here suggested previously)
    Gear List:
    Some links I like: 1 2 3 4 5 6 7 8 9 10

  3. #3
    Join Date
    Mar 2005
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    Quote Originally Posted by Vich
    With IS! (As someone here suggested previously)
    I'd settle for no-frills 1.5x...
    Some Gear: Nikon D700; Nikkor AF-S 50 f/1.4 G; Nikkor AF-S 24-85 3.f/5-4.5 G ED; Tamron 28-300 f/3.5-6.3 VC; Nikon SB-800; Velbon Maxi-F; Canon Pixma Pro 9000; Canon S3IS, Canon SD500; Epson 4990; Epson P5000; Wacom Intuos 3

    Main Software: Capture NX2; Adobe PhotoShop CS2; Corel Paintshop Pro X2 Ultimate

    Sold: Canon XT/350D, EF 24-105mm f/4 L IS, EF 100mm f/2.8 Macro; EF-S 10-22mm f/3.5-4.5, Sigma 18-200 OS; Canon ET EF 25II; Kenko Pro 300 DG, Canon 430EX, Canon BG-E3.

  4. #4
    Join Date
    Sep 2005
    Location
    Chico, California most of the time
    Posts
    180
    Canon will probably come out with some very slight mounting change to its stable of EF-S lenses to enable using extenders. Then you can buy all new lenses.

  5. #5
    Join Date
    May 2005
    Location
    Crapville, Australia
    Posts
    5,148
    Quote Originally Posted by JTL
    Does anyone know why this wouldn't be technically possible? Seems like a slam dunk idea. I'm surprised a third party like Kenko hasn't stepped up...
    Which EF-S lens would you like to extend? I don't really see much of a market.

    Any lens worth extending is going to be EF IMO.
    Christian Wright; Dip Phot
    EOS 5D Mark III | EOS 600D | EOS-1V HS
    L: 14/2.8 II | 24/1.4 II | 35/1.4 | 50/1.2 | 85/1.2 II | 135/2 | 180/3.5 Macro | 200/2.8 II | 400/2.8 IS | 16-35/2.8 II | 24-105/4 IS | 70-200/2.8 IS II | 100-400/4.5-5.6 IS
    580EX II | EF 12 II | EF 25 II

  6. #6
    Join Date
    Jul 2005
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    8,163
    Quote Originally Posted by cwphoto
    Which EF-S lens would you like to extend? I don't really see much of a market.

    Any lens worth extending is going to be EF IMO.
    I agree. Unless Canon came out with an EF-S 400mm f/2.8 IS that I haven't heard about...

    ...which, btw, probably wouldn't come with a hood.

  7. #7
    Join Date
    Jul 2005
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    6,590
    Only Canon makes EF-S lenses. All other reduced image circle lenses, like from Sigma, Tamron and Tokina, are EF lenses... although with a reduced "APS-C" image circle.

    What EF-S lenses are there? 18-55, 17-85, 10-22, 17-55 and a 60mm macro.

    Not really a target group of lenses that will make one want an extender, is it?

    You can extend your Sigma 18-200 (which is not an EF-S lens) with for instance a Soligor 1.7x tele convertor. But, due to the not so big max. aperture of your lens, you will probably not be able to auto focus very reliably or at all.

    What makes a Canon EF-S mount lens different from a APS-C lens from Sigma, I hear you ask? EF-S lenses have a back element that protrudes more into the mirror box than EF lenses. This is also why they can not be mounted on cameras that are full frame or 1.3x, and why they can not be mounted on for instance the EOS 10D (the back element of the lens would collide with the mirror).
    Canon EOS 350D, Tamron SP AF 90mm F/2.8 macro, Sigma 18-50mm F2.8 DC EX, Canon EF 70-200mm f/4 L USM, Tokina AT-X124 Pro 12-24mm F4, Soligor 1.7x C/D4 DG Teleconvertor, Manfrotto 724B tripod, Canon Powershot S30

  8. #8
    Join Date
    Nov 2004
    Posts
    1,807
    as previously pointed out there really aren't any EF-S lenses to extend. the canon TC's only work with a handful of L's as it is (not even regular non-L EF lenses) so them making an EF-S extender would be asking a bit much.
    canon 17-40 L, 70-200 f2.8 L, 400 f5.6 L, 50 f1.4 & f1.8, 1.4x TC, sigma 15 f2.8 fisheye, flash 500 DG Super, kenko extension tubes

    note to self: don't participate in sad, silly threads unless you're looking for sad, silly responses.

    "anti-BS filter" (from andy): http://dcresource.com/forums/showpos...94&postcount=4

  9. #9
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    Mar 2005
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    Quote Originally Posted by coldrain
    What makes a Canon EF-S mount lens different from a APS-C lens from Sigma, I hear you ask? EF-S lenses have a back element that protrudes more into the mirror box than EF lenses.
    Thank you Coldrain!

    I ask a technical question and you're the only one who bothered to give a technical answer instead just slamming my question (like most did), so thanks again.

    So, I want to follow up on something you said...let's take the Sigma and Tamron APS-C only lenses (DC and Di II only)....like the 18-200 or the 18-125. Are you saying that these lenses are designed differently than the EF-S lenses, and that they do not protrude into the mirror box in the same way?

    Thanks!
    Some Gear: Nikon D700; Nikkor AF-S 50 f/1.4 G; Nikkor AF-S 24-85 3.f/5-4.5 G ED; Tamron 28-300 f/3.5-6.3 VC; Nikon SB-800; Velbon Maxi-F; Canon Pixma Pro 9000; Canon S3IS, Canon SD500; Epson 4990; Epson P5000; Wacom Intuos 3

    Main Software: Capture NX2; Adobe PhotoShop CS2; Corel Paintshop Pro X2 Ultimate

    Sold: Canon XT/350D, EF 24-105mm f/4 L IS, EF 100mm f/2.8 Macro; EF-S 10-22mm f/3.5-4.5, Sigma 18-200 OS; Canon ET EF 25II; Kenko Pro 300 DG, Canon 430EX, Canon BG-E3.

  10. #10
    Join Date
    Nov 2004
    Posts
    1,807
    from my point of view i don't see anyone slamming your post
    canon 17-40 L, 70-200 f2.8 L, 400 f5.6 L, 50 f1.4 & f1.8, 1.4x TC, sigma 15 f2.8 fisheye, flash 500 DG Super, kenko extension tubes

    note to self: don't participate in sad, silly threads unless you're looking for sad, silly responses.

    "anti-BS filter" (from andy): http://dcresource.com/forums/showpos...94&postcount=4

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