Anyone else have AF problems with the 24mm STM lens?

Late last year I tried two copies of the new 24mm STM lens on my 650D. Both times the AF was not consistent, actually was pretty consistent being a bit "off". But it was dead-on using live view. I returned both lenses. FYI, my 40mm STM lens AF is dead-on with my 650D.

By now, there are several reviews posted about this lens (none here) and I've not yet read anything about AF problems.

no issues with mine. I use it on my T3i.

seri_art wrote:

Late last year I tried two copies of the new 24mm STM lens on my 650D. Both times the AF was not consistent, actually was pretty consistent being a bit "off". But it was dead-on using live view. I returned both lenses. FYI, my 40mm STM lens AF is dead-on with my 650D.

By now, there are several reviews posted about this lens (none here) and I've not yet read anything about AF problems.

Is is it not a contrasty lens?  It misses focus on subjects with little contrast to work with such as in low light?  I think that is the issue with my 50mm f1.4 (and it isn't stabilized).  My 50mm lens also works better in live view because focus is achieved using different methods than contrast.

How well does it focus on well lit subjects with high shutter speeds?

I really didn't try that. I only tested it in fairly low light, similar to what I would find at an indoor party where it would be a good "social" lens. As I said, my 40mm STM lens has no problem with AF in that same situation.

ZX11 wrote:

How well does it focus on well lit subjects with high shutter speeds?

seri_art wrote:

I really didn't try that. I only tested it in fairly low light, similar to what I would find at an indoor party where it would be a good "social" lens. As I said, my 40mm STM lens has no problem with AF in that same situation.

ZX11 wrote:

How well does it focus on well lit subjects with high shutter speeds?

You should try in better lighting.  The focusing accuracy at very shallow DOF's (to test focus accuracy) should improve.  Also, I noticed the non stabilized lenses really needed fast shutter speeds to get things sharp like a stabilized lens can.  Handheld sharpness with non-stabilized lenses is a matter of opinion on what is acceptable motion blur.

My 50mm f1.4 would have problems indoors low light.  Just where I thought a f1.4 lens would excel.  It could get nice photos but it doesn't always work that way.  Contrast just falls off too fast.  I think my lenses chromatic distortion issues makes the problem with missing fine focus worse.  Can a camera achieve fine focus, by contrast methods, if the lens is throwing color fringing into the mix?  I think that is another reason the UD elements in the "L" lenses are worth the money (if you have it).  How is the chromatic distortion on the 24mm?

So, auto focusing techniques and limitations is another skill a photographer needs.  And why the 7D mkII various focusing settings seem pretty cool.

- One of my main uses for that lens would be in lower-light social situations. So if it won't reliably focus in that setting, it won't work for me.

- The shutter speed was fine. I used flash to make sure the shutter speed was fast enough. It was just focusing in front of or behind the supposed focal point.

- Of course I could get another copy and use it in Live View where it focused perfectly.

ZX11 wrote:

You should try in better lighting. The focusing accuracy at very shallow DOF's (to test focus accuracy) should improve. Also, I noticed the non stabilized lenses really needed fast shutter speeds to get things sharp like a stabilized lens can. Handheld sharpness with non-stabilized lenses is a matter of opinion on what is acceptable motion blur.

My 50mm f1.4 would have problems indoors low light. Just where I thought a f1.4 lens would excel. It could get nice photos but it doesn't always work that way. Contrast just falls off too fast. I think my lenses chromatic distortion issues makes the problem with missing fine focus worse. Can a camera achieve fine focus, by contrast methods, if the lens is throwing color fringing into the mix? I think that is another reason the UD elements in the "L" lenses are worth the money (if you have it). How is the chromatic distortion on the 24mm?

Another plus for the M 22F2
--
>> I love the Canon EF-M 11-22mm f/4-5.6 IS STM lens! <<