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Forums Lobby GET TO KNOW YOUR CAMERA & MASTER IT Nikon D7100, D7000 (Public) topic #8600
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Subject: "Getting AF confirm and exposure in manual focus lens?" Previous topic | Next topic
Chippy569 Registered since 21st Apr 2011Thu 21-Apr-11 09:13 PM
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"Getting AF confirm and exposure in manual focus lens?"


US
          

Hey, just picked up a Rokinon 14mm/2.8, the "UMC" version which is supposed to support exposure reporting and focus confirm. I get no sort of focus confirm on the D7K, but then I'm not sure I understand how it's supposed to work. What AF mode do I need to be in, and do I need to half-press the shutter to get it to try? Also, it's improperly reporting aperture -- for example when the lens is at F/2.8 the camera reads that as F/0. When stopped all the way down to F/22, it reads F/7 or so.

Would appreciate some help!

-David

  

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gkaiseril Gold Member Nikonian since 28th Oct 2005Thu 21-Apr-11 09:40 PM
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#1. "RE: Getting AF confirm and exposure in manual focus lens?"
In response to Reply # 0
Thu 21-Apr-11 09:45 PM by gkaiseril

Chicago, US
          

The lens is not chipped. There is no IC chips in the lens and not electronic contacts for communication between the lens and camera. There is no SWM focus motor support on lens.

Have you set up the Non-CPU lens data in your camera?

See pages 159 - 160 or your camera manual.

Set focal length to 13 or 15, no 14.
Set maximum aperture to 22.

The lens will be a manual focus lens - Focus Mode: manual, pages 99-100 of your camera manual. Half press the shutter release to activate the AF circuity, turn the focus ring, the focus light will come on when you achieve focus for the selected focus point. Open the aperture wide open to let enough light in for focus, then stop down for exposure.

See the Ken Rockwell's review: Samyang 14mm f/2.8 (FX) aka Pro Optic, Rokinon, Bower (2009-). Pretty straight forward, no sarcasm, no B.S.

George
My Nikonian Galleries

  

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Chippy569 Registered since 21st Apr 2011Thu 21-Apr-11 10:13 PM
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#2. "RE: Getting AF confirm and exposure in manual focus lens?"
In response to Reply # 1


US
          

Lol, rockwell... Anyway, Rokinon/Samyang re-released the lens, with the "UMC" version, that does have a chip. http://nikonrumors.com/2010/12/28/samyang-ae-14mm-f2-8-ed-as-if-umc-aspherical-lens-now-shipping.aspx -- I idiotically left the AF switch on "auto" which is why I wasn't getting the confirm dot. I will look into non-cpu though, thanks for the pg numbers.

  

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briantilley Moderator Deep knowledge of bodies and lens; high level photography skills Nikonian since 26th Jan 2003Fri 22-Apr-11 08:13 AM
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#3. "RE: Getting AF confirm and exposure in manual focus lens?"
In response to Reply # 2


Paignton, GB
          

>-- I idiotically left the AF switch on "auto" which
>is why I wasn't getting the confirm dot.

That's not the cause. I answered your other post to point out that you must half-press the shutter release to activate the viewfinder display before (or while) turning the lens' focus collar.

Brian
Welsh Nikonian

  

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