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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 17 Jul 2014 (Thursday) 11:19
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Who else doesn't like white lenses?

 
reefvilla
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Jul 20, 2014 18:37 |  #121

CyberDyneSystems wrote in post #17044565 (external link)
It inspired me. I went to Benny's and picked up a gallon of latex flat back paint for $12.99 and some of those smaller rollers and went to work...

We need pics!!! :) Sounds fancy


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pwm2
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Jul 20, 2014 18:40 |  #122

1) Pictures from the lens while white and with an IR heater shining for 30 min on it.
2) Pictures of the lens while painted black.
3) Pictures from the lens while black and with an IR heater shining for 30 min on it.


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werds
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Jul 20, 2014 20:05 |  #123

CyberDyneSystems wrote in post #17044565 (external link)
It inspired me. I went to Benny's and picked up a gallon of latex flat back paint for $12.99 and some of those smaller rollers and went to work...

If you are serious you need to seriously document it (including the process of painting IMO lol)


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Jul 20, 2014 20:41 |  #124

Snafoo wrote in post #17044327 (external link)
I like em cause they're purty.

It's off white.


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AhmedAgbabiaka
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Jul 21, 2014 09:56 |  #125

i actually like the white (off white, eggshell or whatever you want to call it) color of canon lenses. it makes the canon brand stand out from their competitors. this is good for canon from a marketing standpoint. without even seeing a logo, they have brand recognition. from a photographer's view i could see why some might not like it though.


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Lbsimon
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Jul 21, 2014 13:09 |  #126

Ask your officemates/friends/ac​quaintances/etc. if they ever seen white lenses, and if yes, whether they know which brand they are. I bet that all or almost all non-photographers will answer "no" to at least one of these questions.


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Jul 21, 2014 19:49 as a reply to  @ Lbsimon's post |  #127

Wrap it in signwritting vinyl, the stuff they use for form fitting shapes, same as the stuff the wrap cars in, fairly easy to apply, easy to remove.

Heck you could even get some of that fake carbon fibre looking stuff!


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Foggiest
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Jul 22, 2014 03:38 |  #128

pwm2 wrote in post #17044390 (external link)
Changes to thermal mass doesn't matter much - it's just a question of how fast things heats up.

Changes to thermal transfer affects how fast heat spreads through a material - but we already have hot surfaces and faster heat spreads just means better spread of the heat into the lens.

It is possible to give the surface micro-pores, to increase the surface area, allowing more area to radiate out heat. But it isn't an ideal route when you can't control the air stream moving over the lens. It works way better in drive stages of transmitters, amplifiers etc where you can direct the movement of the air by shaping and controlling orientation of surfaces.

So the main thing here is to increase the reflection of heat, while still having the lens look black - which is the nanoparticle color concept I did mention. More than 50% of the sun energy is outside of the visible spectra, so there is a lot of energy that can be avoided by adjusting what wavelengths to absorb and what wavelenghts to reflect.

Edit: An interesting reading about colors - in this case related to gold and metals. And the last part shows a bit about colors from nano-particles:
http://www.webexhibits​.org/causesofcolor/9.h​tml (external link)

I have a brain fart for you PWM ( a little tongue in cheek too).

Basically make all junctions between lens, collar and tripod thermally conductive.
At the junction sites place Peltier heat pumps and push the heat into tripod collar and head.
The tripod and collar would be totally waterproof and can be submerged in water for cooling (after removing camera and lens:P) etc .

Told you it was silly :D :P

Then you can have a black lens ;)




  
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VaDimZH
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Jul 22, 2014 04:24 |  #129

sandpiper wrote in post #17037676 (external link)
Mainly because the other brands don't use fluorite lens elements in camera lenses (there are some used in binoculars etc). Nikon states that they don't use fluorite because it cracks more easily than glass and is too sensitive to heat. Canon say that they are the only users of fluorite because only they have figured out how to grow large enough crystals at sufficiently high optical quality.

Besides, Nikon have also produced white lenses, although they call them "light grey", also to combat heat build up. Other companies have made them too, of the bigger name brands Minolta has done white lenses as have Sigma.

So white lenses are not unique to Canon, but they make them in far greater quantities due to the use of fluorite in the big telephotos.

Nikon's NEW 800mm and 400mm use Fluorite and Electronic Diaphragm same like Canon which has electronic diaphragms since 1987,BUT Nikon's 800mm and 400mm with Fluorite is BLACK,NOT white!


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pwm2
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Jul 22, 2014 07:54 |  #130

Foggiest wrote in post #17047692 (external link)
I have a brain fart for you PWM ( a little tongue in cheek too).

Basically make all junctions between lens, collar and tripod thermally conductive.
At the junction sites place Peltier heat pumps and push the heat into tripod collar and head.
The tripod and collar would be totally waterproof and can be submerged in water for cooling (after removing camera and lens:P) etc .

Told you it was silly :D :P

Then you can have a black lens ;)

Yes, heat pipes letting the tripod help would help. Could even help very well.

Just a tiny disadvantage in the extra weight for the heat pipes :p

Nanoparticle-based paint reflecting IR has a weight advantage here :)


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Jul 22, 2014 09:32 |  #131

And for the record, they're not white but cream colored.


I use a Kodak Brownie

  
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piQturesQue
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Jul 22, 2014 09:40 |  #132

Jon_Doh wrote in post #17048193 (external link)
And for the record, they're not white but cream colored.

I think, we now had about 5 different guesses on the color :D


Constructive criticism and editing always welcome.

  
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AlanU
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Jul 22, 2014 09:43 |  #133

Canon's intent to segregate from other makers. Maybe its intentional to monitor the market share when you see a "sea" of sports photographers at a sports event ;)

Possibly Canon should get out of their comfort zone as they see the "white/cream" lenses diminish from the "sea" of sports photogs at sports events. Hopefully Canon will produce better bodies that manage less high Iso purple banding. Hmmm Canon is clever in selecting white.....??


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Foggiest
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Jul 22, 2014 10:55 |  #134

pwm2 wrote in post #17047988 (external link)
Yes, heat pipes letting the tripod help would help. Could even help very well.

Just a tiny disadvantage in the extra weight for the heat pipes :p

Nanoparticle-based paint reflecting IR has a weight advantage here :)

...but, but, I have the pieces of string all knotted together now! :p




  
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CyberDyneSystems
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Jul 22, 2014 11:58 |  #135

pwm2 wrote in post #17047988 (external link)
...

Nanoparticle-based paint reflecting IR has a weight advantage here :)

Yes, as good as painting it white :)


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