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Archive 2013 · Canon Ultra Wides with Fluorite lens element
  
 
jcolwell
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p.2 #1 · 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.



Feb 26, 2013 at 12:00 AM
PhilDrinkwater
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p.2 #2 · 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


Feb 26, 2013 at 12:58 AM
scalesusa
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p.2 #3 · 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




Feb 26, 2013 at 01:02 AM
RobDickinson
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p.2 #4 · p.2 #4 · Canon Ultra Wides with Fluorite lens element


WA pancake is unpossible with the current register distances and mirror boxes AFIK


Feb 26, 2013 at 01:05 AM
a.RodriguezPix
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p.2 #5 · p.2 #5 · Canon Ultra Wides with Fluorite lens element


RobDickinson wrote:
WA pancake is with the current register distances and mirror boxes AFIK

unpossible, lol, ralph wiggins style!



Feb 26, 2013 at 01:18 AM
NCAndy
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p.2 #6 · p.2 #6 · Canon Ultra Wides with Fluorite lens element


Can't I just brush my current lenses with a fluorite toothpaste? lol (it's fluoride, I know)

I know Canon will build some stellar wide angle lens I'll want, but I also know I won't want to pay the price they ask for it.



Feb 26, 2013 at 01:29 AM
Pixel Perfect
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p.2 #7 · 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.



Feb 26, 2013 at 01:30 AM
PetKal
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p.2 #8 · p.2 #8 · Canon Ultra Wides with Fluorite lens element


Pixel Perfect wrote:
you see white lenses to minimise heat transfer.


...or perhaps to minimize radiant heat absorption by the barrel .



Feb 26, 2013 at 01:41 AM
 

Search in Used Dept. 



Pixel Perfect
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p.2 #9 · p.2 #9 · Canon Ultra Wides with Fluorite lens element


PetKal wrote:
...or perhaps to minimize radiant heat absorption by the barrel .


To minimise irradiant heat transfer



Feb 26, 2013 at 01:56 AM
RobDickinson
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p.2 #10 · p.2 #10 · Canon Ultra Wides with Fluorite lens element


maximise radiant marketing...


Feb 26, 2013 at 02:02 AM
scalesusa
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p.2 #11 · p.2 #11 · Canon Ultra Wides with Fluorite lens element


RobDickinson wrote:
WA pancake is unpossible with the current register distances and mirror boxes AFIK


I said wide angle, not ultra wide. BTW 20mm pancake lenses for Canon already exist, so they are not unpossible.

Its a matter of bending the light a extreme amount, which is helped with fluorite glass and even more with diffractive optics.

http://www.adorama.com/VT2035EOS.html?sub=forum&utm_term=Other&utm_medium=Affiliate&utm_campaign=Other&utm_source=rflaid64393




Feb 26, 2013 at 03:13 AM
PhilDrinkwater
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p.2 #12 · 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.


Thanks



Feb 26, 2013 at 07:51 AM
andyjaggy82
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p.2 #13 · p.2 #13 · Canon Ultra Wides with Fluorite lens element


scalesusa wrote:
I said wide angle, not ultra wide. BTW 20mm pancake lenses for Canon already exist, so they are not unpossible.

Its a matter of bending the light a extreme amount, which is helped with fluorite glass and even more with diffractive optics.

http://www.adorama.com/VT2035EOS.html?sub=forum&utm_term=Other&utm_medium=Affiliate&utm_campaign=Other&utm_source=rflaid64393



I want.



Feb 27, 2013 at 11:07 PM
EB-1
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p.2 #14 · p.2 #14 · Canon Ultra Wides with Fluorite lens element


So by the time this lens comes to market in 2022, there will be what, a dozen buyers left?

EBH



Feb 28, 2013 at 02:20 AM
Sneakyracer
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p.2 #15 · 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


Feb 28, 2013 at 04:29 AM
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