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Archive 2012 · Canon 24-70 II mystery switch.
  
 
Tom K.
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p.1 #1 · p.1 #1 · Canon 24-70 II mystery switch.


What the heck is that switch on the new Canon 24-70 version 2 I have circled in Red for?









Feb 06, 2012 at 06:56 PM
eskimochaos
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p.1 #2 · p.1 #2 · Canon 24-70 II mystery switch.


How do you know it's a switch?


Feb 06, 2012 at 06:59 PM
skibum5
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p.1 #3 · p.1 #3 · Canon 24-70 II mystery switch.


Tom K. wrote:
What the heck is that switch on the new Canon 24-70 version 2 I have circled in Red for?



probably zoom lock, my 70-300L has the exact same switch in the same spot and it is a zoom lock.



Feb 06, 2012 at 06:59 PM
S Dilworth
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p.1 #4 · p.1 #4 · Canon 24-70 II mystery switch.


It's probably a zoom lock, to prevent the lens extending by the force of gravity. (This lens will extend significantly when zoomed to 70 mm.)


Feb 06, 2012 at 07:00 PM
Tom K.
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p.1 #5 · p.1 #5 · Canon 24-70 II mystery switch.


eskimochaos wrote:
How do you know it's a switch?


I don't know what it is. It is raised off the surface so I assume it's a switch of some sort.



Feb 06, 2012 at 07:01 PM
erikburd
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p.1 #6 · p.1 #6 · Canon 24-70 II mystery switch.


You too? I was wondering what that switch might be. I was thinking IS, but that would typically be next to the AF/MF switch, at least on most zooms anyway. A zoom lock switch might be more realistic, but who knows.



Feb 06, 2012 at 07:03 PM
Tom K.
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p.1 #7 · p.1 #7 · Canon 24-70 II mystery switch.


Why would it need a zoom lock switch? The 24-70 version 1 didn't need it.


Feb 06, 2012 at 07:04 PM
eskimochaos
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p.1 #8 · p.1 #8 · Canon 24-70 II mystery switch.


CHEAP CONSTRUCTION


Feb 06, 2012 at 07:08 PM
cputeq
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p.1 #9 · p.1 #9 · Canon 24-70 II mystery switch.


Tom K. wrote:
Why would it need a zoom lock switch? The 24-70 version 1 didn't need it.


Heavier front element?



Feb 06, 2012 at 07:17 PM
Jeff
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p.1 #10 · p.1 #10 · Canon 24-70 II mystery switch.


IS




Feb 06, 2012 at 07:18 PM
 

Search in Used Dept. 



skibum5
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p.1 #11 · p.1 #11 · Canon 24-70 II mystery switch.


Tom K. wrote:
Why would it need a zoom lock switch? The 24-70 version 1 didn't need it.


this one has 70mm extending out and it might mean longer and heavier extension

just a guess



Feb 06, 2012 at 07:19 PM
sirimiri
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p.1 #12 · p.1 #12 · Canon 24-70 II mystery switch.


The hood bayonet is at the front of the lens, not at some collar placed farther back towards the imaging plane. Unless they've got some funky hood design that I'd love to see, as it would have to accommodate both wide angle and telephoto, I'm not sure that the front of the lens extends.

At least, based on speculative images like this.

If it were an internal zoom it would be the cat's meow.



Feb 06, 2012 at 07:31 PM
SchnellerGT
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p.1 #13 · p.1 #13 · Canon 24-70 II mystery switch.


Either zoom lock or MFD selector (range limit).


Feb 06, 2012 at 07:36 PM
dolina
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p.1 #14 · p.1 #14 · Canon 24-70 II mystery switch.


I hope it's an IS switch. It is not permissible that a 3rd party lens be of a superior feature to that of a first party lens.


Feb 06, 2012 at 07:42 PM
Contrails
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p.1 #15 · p.1 #15 · Canon 24-70 II mystery switch.


skibum5 wrote:
this one has 70mm extending out and it might mean longer and heavier extension

just a guess


My version 1 extends out when it is at its widest, 24mm



Feb 06, 2012 at 07:48 PM
S Dilworth
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p.1 #16 · p.1 #16 · Canon 24-70 II mystery switch.


Tom K. wrote:
Why would it need a zoom lock switch? The 24-70 version 1 didn't need it.


I can think of a few reasons:
  1. This lens will extend significantly, since it uses an optical layout ("positive-lead" type) that requires that.
  2. Since it uses positive-lead type optics, the front group of elements is very large and heavy, and therefore acted upon more strongly by gravity.
  3. The new design translates a small movement of the zoom ring into a large change in length at the wide end of the range (that's why the focal lengths are tightly bunched up at the wide end); said another way, gravity has a large mechanical advantage in extending the zoom at the wide end. This means it will likely flop out to say, 35 mm, with relatively little force (especially after a few years of use!).
  4. When extended, the total length with hood will increase, whereas the old lens was shrouded in a fixed hood so didn't increase in overall length; it's therefore more important that this new lens doesn't extend by itself.
  5. The new construction may use more plastic (maybe even the extending barrel?) to reduce weight and cost, which may take its toll on snugness.



Feb 06, 2012 at 08:15 PM
jorkata
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p.1 #17 · p.1 #17 · Canon 24-70 II mystery switch.


Tom K. wrote:
Why would it need a zoom lock switch? The 24-70 version 1 didn't need it.


Most likely for video users.



Feb 06, 2012 at 08:33 PM
Tom K.
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p.1 #18 · p.1 #18 · Canon 24-70 II mystery switch.


S Dilworth wrote:
I can think of a few reasons:
  1. This lens will extend significantly, since it uses an optical layout ("positive-lead" type) that requires that.
  2. Since it uses positive-lead type optics, the front group of elements is very large and heavy, and therefore acted upon more strongly by gravity.
  3. The new design translates a small movement of the zoom ring into a large change in length at the wide end of the range (that's why the focal lengths are tightly bunched up at the wide end); said another way, gravity has a large mechanical advantage in extending the zoom at the wide end. This
  4. When extended, the total length with hood will increase, whereas the old lens was shrouded in a fixed hood so didn't increase in overall length; it's therefore more important that this new lens doesn't extend by itself.
  5. The new construction may use more plastic (maybe even the extending barrel?) to reduce weight and cost, which may take its toll on snugness.
...Show more

That sounds plausible. Thank you for your insights on this.



Feb 06, 2012 at 10:40 PM
Ralph Conway
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p.1 #19 · p.1 #19 · Canon 24-70 II mystery switch.


It looks more beautiful and much smaller then its predecessor!
Did somebody read about the size. My japanese is not that good.



Feb 06, 2012 at 11:19 PM
RobertLynn
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p.1 #20 · p.1 #20 · Canon 24-70 II mystery switch.


domo arrigato mr roboto


Feb 06, 2012 at 11:23 PM
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