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DPChallenge Forums >> Hardware and Software >> Sigma 12-24 AF/M switch is where?
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09/30/2010 07:22:42 AM · #1
I'd normally turn to the master (21.gif AndrewT) for questions such as this, but he's probably busy working up some magic for the FS, and this has been driving my crazy since I noticed it.

I bought a Sigma 12-24mm (Nikon mount) through Amazon a few months back. Now that I'm looking to add to my lens collection I've been reading a lot of reviews, and I'll occasionally read reviews of the lenses I currently own just for kicks.

So I've noticed, on every site I've visited, that the images of the Sigma 12-24mm clearly show a M/AF switch near the mount. Yet my copy does not have one. What the? Did I get an old copy? A limited edition copy? A half-engineered copy? This is really bugging me.

Any thoughts on this?
09/30/2010 08:03:48 AM · #2
Mine has a switch by the mount, i thought they all were like that. Some older Sigi lenses had a push/pull focus ring that changed between mf/af
09/30/2010 08:28:13 AM · #3
Yeah, it's weird. I'm hoping it's normal for the Nikon version and it's the Canon mount photo that's been distributed in the marketing literature. They could have done a better job with that, I think.
09/30/2010 10:43:42 AM · #4
Any other-hemisphere 12-24mm-owners up yet to help with this question?
09/30/2010 11:02:32 AM · #5
It's not a push-pull focus ring?
09/30/2010 11:06:36 AM · #6
No, the focus ring is fixed, other than turning of course.
09/30/2010 11:22:04 AM · #7
I've never seen one without the switch on any mount.

Stupid question and I mean no offense, but are you sure we're talking about the right lens?
09/30/2010 11:23:53 AM · #8
Originally posted by bohemka:

No, the focus ring is fixed, other than turning of course.

As in, it turns in AF mode, but you can't turn it yourself (without wrecking the AF motor, that is) ?
09/30/2010 11:25:00 AM · #9
No offense taken at all. Mine feels like the dumb question. Yes, the Sigma 12-24mm 4.5-5.6 EX DG for Nikon.
09/30/2010 11:26:39 AM · #10
Originally posted by JH:

Originally posted by bohemka:

No, the focus ring is fixed, other than turning of course.

As in, it turns in AF mode, but you can't turn it yourself (without wrecking the AF motor, that is) ?


Well I switch to manual on the body and then it turns freely. I'm confused.
09/30/2010 11:33:50 AM · #11
Some of the AF Nikon lenses were the same way. You have to switch the camera to "manual focus" to disconnect the focusing motor in the camera from the lens so you could manually focus without fighting the AF motor in the camera.
There is a little hole in the lens mount on the camera with a shaft that looks like the end of a flat blade screwdriver in it that turns a rod in the lens connected to the focusing gears in the lens. I'm not sure about the Sigma lens, but I assume that it was built similar to the earlier manual Nikon glass.
ETA
The Nikon AF S lenses use a motor in the lens itself, so they don't connect to the motor in the camera.

Message edited by author 2010-09-30 11:35:09.
09/30/2010 11:45:45 AM · #12
Nope No switch on mine !!!!

and no , no magic for FS this month LOL!!! probably will be a struggle to even get a 6 , I bet you guys can't recognize which is mine this month.
09/30/2010 12:34:14 PM · #13
Canon version here, and yep it has the switch...
09/30/2010 01:05:58 PM · #14
I have the Nikon version. It has the push/pull focusing ring (no switch). It works perfectly fine.
09/30/2010 01:11:14 PM · #15
Cool, good to hear you don't have a switch, Andrew... but... Ursula, you have a push/pull ring? Is that the Tokina 12-24 in your profile you are talking about, or is it the Sigma 12-24?
09/30/2010 01:41:38 PM · #16
Originally posted by bohemka:

Cool, good to hear you don't have a switch, Andrew... but... Ursula, you have a push/pull ring? Is that the Tokina 12-24 in your profile you are talking about, or is it the Sigma 12-24?


RED FACED URSULA: Oh bummer, it's the Tokina. I don't have a Sigma wide angle. What's in a brand name anyway, right? :)

PS: Second time today that I get in trouble for not reading carefully. I got to learn to read better!

Message edited by author 2010-09-30 13:43:47.
09/30/2010 01:55:22 PM · #17
No worries! Just trying to figure out the lens I use every day, that's all. I think I've got it now. Thanks everyone for helping me solve that which needed no solving in the first place.
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