p.2 #1 · Canon Ultra Wides with Fluorite lens element
I've owned the 50-200L and 100-300L; two of the 100-300L, in fact. I decided I wanted faster AF, constant aperture (in the case of the 50-200L), and IS. I couldn't afford to keep them and buy new lenses, and so I had to trade up.
Otherwise, I'd probably still be using my 20D and 30D.
p.2 #2 · Canon Ultra Wides with Fluorite lens element
I'm not really that into optics (but I love sharp lenses) so can anyone give me a couple of lines on what fluorite is and why it's better? Spare the techy details - just an overview would be great
p.2 #3 · Canon Ultra Wides with Fluorite lens element
Maybe a wide angle pancake? I wonder what they mean by highly miniaturized?
From the Patent: (Poot Translation as usual)
An object of the present invention is to obtain the zoom lens and single focus lens of a wide field angle which correct the chromatic aberration of magnification good and can respond to highly minute-ization
p.2 #7 · Canon Ultra Wides with Fluorite lens element
PhilDrinkwater wrote:
I'm not really that into optics (but I love sharp lenses) so can anyone give me a couple of lines on what fluorite is and why it's better? Spare the techy details - just an overview would be great
Basically fluorite offers very low dispersion (think of rainbow produced by a prism) ie different wavelengths have very nearly the same refractive index and so you get far lower chromatic aberration. Other companies use things like SD, ED, UD, SLD glass etc to achieve similar results. Canon grow their own synthetic Fluorite crystals. It has a large thermal coefficient of expansion compared to some glass and this is why you see white lenses to minimise heat transfer.
p.2 #12 · Canon Ultra Wides with Fluorite lens element
Pixel Perfect wrote:
Basically fluorite offers very low dispersion (think of rainbow produced by a prism) ie different wavelengths have very nearly the same refractive index and so you get far lower chromatic aberration. Other companies use things like SD, ED, UD, SLD glass etc to achieve similar results. Canon grow their own synthetic Fluorite crystals. It has a large thermal coefficient of expansion compared to some glass and this is why you see white lenses to minimise heat transfer.
p.2 #15 · Canon Ultra Wides with Fluorite lens element
Honestly the 14L II is one of Canon's best prime lenses already. I really like mine. I see no need for a newer version. The 16-35mm 2.8L on the other hand. Well, would be awesome to have a 14-24mmL
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