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Archive 2014 · Canon Technical report on 16-35 f/4 IS and 10-18 IS EF-S

  
 
skibum5
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p.1 #1 · p.1 #1 · Canon Technical report on 16-35 f/4 IS and 10-18 IS EF-S


http://www.canon.com/camera-museum/tech/report/2014/06/

One that thing that is made abundantly clear is why it goes to 35mm and not 40mm+. It is in fact due to the design type, they'd have had to change the design considerably as it looks like elements would crash into each other if they had tried even for 40mm, nevermind the 50mm of the early rumors. Probably good design decision in the end. I assume it keeps quality up.



Jun 10, 2014 at 01:38 PM
killersnowman
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p.1 #2 · p.1 #2 · Canon Technical report on 16-35 f/4 IS and 10-18 IS EF-S


I just posted something on this and wondered why the 16-35 has 2 diaphragms...

Whats up with that? Is one used on the long end and one on the wide?



Jun 10, 2014 at 01:43 PM
skibum5
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p.1 #3 · p.1 #3 · Canon Technical report on 16-35 f/4 IS and 10-18 IS EF-S


killersnowman wrote:
I just posted something on this and wondered why the 16-35 has 2 diaphragms...

Whats up with that? Is one used on the long end and one on the wide?


Yeah I'm not sure, maybe so, maybe one just helps cut down extraneous flare at one end of the range while the other provides the actual aperture??

Maybe it can cut out some nasty rays early at one end of the range before they



Jun 10, 2014 at 02:28 PM
RobDickinson
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p.1 #4 · p.1 #4 · Canon Technical report on 16-35 f/4 IS and 10-18 IS EF-S


Looks good.


Wondering why new lens designs don't come with a tripod screw at the nodal point...



Jun 10, 2014 at 03:38 PM
killersnowman
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p.1 #5 · p.1 #5 · Canon Technical report on 16-35 f/4 IS and 10-18 IS EF-S


Im sure theh have many reasons... One being that nodal point changes with focal length so on a zoom it would be useless



RobDickinson wrote:
Looks good.

Wondering why new lens designs don't come with a tripod screw at the nodal point...




Jun 10, 2014 at 03:56 PM
RobDickinson
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p.1 #6 · p.1 #6 · Canon Technical report on 16-35 f/4 IS and 10-18 IS EF-S


I guess in longer zooms it would be bad, can't imagine it changes much on a short zoom, be easier than not having it anyhow.

For primes it would be great, one of my favorite points about the scnider tilt shifts



Jun 10, 2014 at 05:44 PM





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