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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 11 Jan 2012 (Wednesday) 23:22
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Carl Zeiss and aperture rings

 
Riles
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Jan 11, 2012 23:22 |  #1

I'm sure this is going to prove to be a silly question, but why does the ZE (Canon mount) version of the lenses not have a manual aperture ring? I was just curious.




  
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krb
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Jan 11, 2012 23:24 |  #2

Because the aperture is electronically controlled by the camera.


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Relaxtech
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Jan 12, 2012 00:58 as a reply to  @ krb's post |  #3

Do you know why does CZ have not auto focus function?


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Riles
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Jan 12, 2012 01:00 |  #4

Isn't that true for most DSLRs?




  
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ohata0
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Jan 12, 2012 03:00 |  #5

I think autofocus is reserved for sony...might be some sort of contract or something. Not sure about the details though, but that's my understanding.

It's a bit expensive, but you CAN get autofocus and aperture control w/ contax N lenses...you'd have to pay a bit to get it converted though.

Here's a link that reviews a conrus converted contax n lens.
http://www.photozone.d​e …on-ef-review--test-report (external link)




  
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titi_67207
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Jan 12, 2012 03:49 |  #6

If you want a manual aperture ring, see the M42 carl zeiss Jena lens, Contax Zeiss or Samyang new lenses...

Titi


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CV 15 4.5 III | TS-E 24L II | FE 28 2 | (50+85) 1.4 | 135 2 | 70-200 4.0L | a collection of old Zuikos + FD + Adaptall + AI-s + M42

  
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Canon ­ Bob
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Jan 12, 2012 03:56 |  #7

krb wrote in post #13689803 (external link)
Because the aperture is electronically controlled by the camera.

Riles wrote in post #13690100 (external link)
Isn't that true for most DSLRs?

Many are mechanically controlled, not electronic.

Bob


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Riles
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Jan 12, 2012 14:08 |  #8

Canon Bob wrote in post #13690440 (external link)
Many are mechanically controlled, not electronic.

Bob

I didn't know that. I pretty much assumed since most lenses these days lack manual aperture control that they had moved on to electronically controlled apertures like Canon. I have learned something new! :D




  
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bpark42
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Jan 12, 2012 15:15 |  #9

titi_67207 wrote in post #13690423 (external link)
If you want a manual aperture ring, see the M42 carl zeiss Jena lens, Contax Zeiss or Samyang new lenses...

Titi

Or the Nikon version(s) of any of the current Z* line...




  
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4thchicken
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Jan 12, 2012 23:28 |  #10

titi_67207 wrote in post #13690423 (external link)
If you want a manual aperture ring, see the M42 carl zeiss Jena lens, Contax Zeiss or Samyang new lenses...

Titi

Wondering if there would be any photography applications where having a manual aperture ring might be advantageous? - or is video the only area?


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krb
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Jan 13, 2012 00:41 |  #11

4thchicken wrote in post #13696199 (external link)
Wondering if there would be any photography applications where having a manual aperture ring might be advantageous?

The aperture ring is an excellent user interface device. Especially for camera bodies that do not have the big wheel on the back.


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vgrab
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Jan 13, 2012 03:26 |  #12

Relaxtech wrote in post #13690091 (external link)
Do you know why does CZ have not auto focus function?

they dont have autofocus because of some kind of patent/copyright legal issues.. its not because they cant/dont want to..


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4thchicken
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Jan 15, 2012 23:54 |  #13

krb wrote in post #13696454 (external link)
The aperture ring is an excellent user interface device. Especially for camera bodies that do not have the big wheel on the back.

From what I can gather, the choice of using a manual aperature ring for zeiss lenses would lead to the loss of electronic aperture and auto focus confirm? (using canon body & ZF or ZF.2 lenses)

Would that be correct?


1DX, x100S, 24-70 II L, 100L, 1.4X TC III, 25/2 ZE, 35/2 ZE, 50/2 ZE, 100/2 ZE, 120-300/2.8 OS S :)

  
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krb
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Jan 16, 2012 14:28 |  #14

4thchicken wrote in post #13711339 (external link)
From what I can gather, the choice of using a manual aperature ring for zeiss lenses would lead to the loss of electronic aperture and auto focus confirm? (using canon body & ZF or ZF.2 lenses)

Would that be correct?

No, not at all. There are lenses like the 14-50 leica that was made for 4/3 cameras that has a manual aperture ring but the ring is not mechanically attached to the aperture. When used on cameras that do not have a compatible electronic interface to accept aperture data from that ring, the aperture is simply controlled from the camera like any other lens.

There is no relationship between the how the aperture is controlled and how the focus mechanism is controlled.


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Carl Zeiss and aperture rings
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