topic Re: 5DIII AF Microadjustment for manual lens? in EOS DSLR & Mirrorless Cameras

5DIII AF Microadjustment for manual lens?

Cunha — Tue, 25 Aug 2015 13:15:03 GMT

Will I be able to do AF Microadjustment for lens with manual focus only?

"AF" means AutoFocus, I know, but I´ve doubts.

My two manual lenses are:

1. Canon MP-E 65mm Macro x1-x5 f/2,8 (this is a very particular lens which focus only by moving the lens itself; no focus ring available).

2. Zeiss ZE 85mm f/1,4 (manual focus only)

Thank you very much.

Regards.

Re: 5DIII AF Microadjustment for manual lens?

jrhoffman75 — Tue, 25 Aug 2015 13:48:01 GMT

I believe No is the correct answer. You can verify by mounting the lens and seeing if its recognized in the AFMA menu.

Re: 5DIII AF Microadjustment for manual lens?

Cunha — Tue, 25 Aug 2015 14:42:38 GMT

Thank you for your help.
When mounted the AFMA menu says:

1. For the Canon lens:
MP-E65mm f/2,8 1-5x Macro Photo

2. For the Zeiss ZE (Zeiss for Canon):
85mm; only ,-(

I guess this feature is just for AF lens, even because the focusing procedure in supposed to be done using the AF function with the lens widest aperture; no?

Re: 5DIII AF Microadjustment for manual lens?

jrhoffman75 — Tue, 25 Aug 2015 14:49:54 GMT

Does camera allow you to select +/- ? When you hold shutter button halfway down and manually focus do you get a beep indicating in-focus?

Re: 5DIII AF Microadjustment for manual lens?

Cunha — Tue, 25 Aug 2015 15:03:28 GMT

With the "tricky" Canon Macro, no, because the focusing procedure in as I explained, moving the whole lens forward and back with the aid of a focusing rail.

With the Zeiss ZE 85mm f/1,4 I´ve the confirmation beep and also the green dot confirmation like an AF Canon lens. This Zeiss communicates with the body like a Canon lens. The only difference is the manual focus (a butter smooth one ,-)

Re: 5DIII AF Microadjustment for manual lens?

jrhoffman75 — Tue, 25 Aug 2015 15:35:59 GMT

Even though it doesn't tell you what lens, does it have a scale for +/- adjust?

If so, take a picture at zero with beep and verify focus. Then dial in a -20 and see if image is still in focus when it beeps.

Re: 5DIII AF Microadjustment for manual lens?

Cunha — Tue, 25 Aug 2015 15:50:57 GMT

I´m sorry; yes I´ve that +/- AF scale -20...0...+20.
I´ll do some tests.
Thanks a lot JR ,-)

Re: 5DIII AF Microadjustment for manual lens?

ScottyP — Tue, 25 Aug 2015 23:17:09 GMT

Even if the body will let you apply a + - AUTOfocus micro adjustment, what the heck would that even do on a manual lens, not to mention the MPE65 which focuses bu moving the camera closer or farther from the target?

Re: 5DIII AF Microadjustment for manual lens?

jrhoffman75 — Wed, 26 Aug 2015 09:16:32 GMT

Aren't focus errors between AF focus and Live View sensor a combination of camera error and lens error. Can AFMA compensate for camera error in manual mode?

If an EF lens in AF mode sets off the Green Dot in contrast AF in Auto, but isn't in sharpest focus on the sensor, would the same lens in Manual Focus mode set off the green dot at the same or a different position - i.e. would the lens focus error be out of the process at that point?

Re: 5DIII AF Microadjustment for manual lens?

Cunha — Tue, 25 Aug 2015 23:24:47 GMT

😉 "AF"MA

Re: 5DIII AF Microadjustment for manual lens?

RobertTheFat — Wed, 26 Aug 2015 11:52:17 GMT

@ScottyP wrote:
Even if the body will let you apply a + - AUTOfocus micro adjustment, what the heck would that even do on a manual lens, not to mention the MPE65 which focuses bu moving the camera closer or farther from the target?

With at least some manual lenses, the AF mechanism will try to tell you when you've achieved focus (with a light or a beep or both - I forget which). If the AFMA is out of whack, you might get a misleading result.

Re: 5DIII AF Microadjustment for manual lens?

Cunha — Wed, 26 Aug 2015 12:17:58 GMT

The Zeiss do that. Beep and light.