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Lenses Discussion of Lenses |
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#1
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Canon EF-S Lenses
Why did Canon bring out the EF-S lens?
Will it raise compatibility issues with my present range of EF lenses for future generations of Canon bodies? Does the 1.6 'crop factor' still apply with these lenses?
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Cheers Ken |
#2
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They're designed specifically for more recent digital cameras with the 1.6 crop factor-sized sensor and won't fit anything other than those models stated (at the moment, 300D, 350D and 20D) as they're a bit shorter at the back end.
The crop factor still applies. As long as Canon keep making bodies with a similar-sized sensor they'll keep making these lenses and probably add a few more. Independent lens makers' offerings with a similar sized image-circle will fit other bodies even full-framed ones although with those you'll get a circular image in the middle of the frame. Some of the zoom lenses can actually be used over some of their range with the 1.3 crop-factor 1D bodies without cut-off (tests in photo magazines will usually give the range possible)
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Adey http://www.birdforum.net/pp_gallery/...00/ppuser/1805 'Write when there is something you know: and not before: and not too damned much after' Ernest Hemingway |
#3
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Adey,
Thanks for the reply. To satisfy my curiosity, what is it about the EF-S fitting that makes them more suitable for DSLR's. How is the shorter back end an advantage? To put it another way, how are they more suitable than the EF fit?
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Cheers Ken |
#4
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Quote:
Leif |
#5
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And I'd better clarify my 'shorter at the back' bit which on re-reading looks a bit 'wrong!' I meant to say a bit 'closer' to the sensor than a conventional lens so they would foul-up the mirror if you fit them to an incompatible camera.
Most telephoto lenses where the rear element is a fair way inside the lens body seem to be OK, giving a near-telecentric design as described by Leif, so it seems as if the biggest advantage is in the re-designing of shorter focal lengths. I've got one of Canon's basic 28-80mm zooms which gives reasonable results on my EOS 50E body but the images on my 20D body are not very good other than 'snapshot' standard.
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Adey http://www.birdforum.net/pp_gallery/...00/ppuser/1805 'Write when there is something you know: and not before: and not too damned much after' Ernest Hemingway |
#6
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Adey
Thanks very much for the clarification. I undestand now. Your help is appreciated.
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Cheers Ken |
#7
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