AFMA w/ 1.4 extenders

[Ew]

Haven't gone through the run myself, but has anyone gone through AFMA with and without an Extender? Do both results hold in the camera?

[neuroanatomist]

Yes, you need to calibrate then separately, the camera treats each lens+TC combo as a unique lens.

[Ew]

Thank you!

[thebowtie]

Hi,
I just did the AFMA on my 5DIII (firmware 1.1.3) with a 70-200 f/2.8L IS II and a 1.4x III, using FoCal Professional, version 1.6.

Like neuro, I have found it registers as a unique combination.

In fact on the 5D mark III, you can register by the lens and TC serial numbers as well - so the AFMA settings are set for Tele and Wide for each lens/combination.
By way of example, my lens AFMA's look like this:

70-200 f/2.8L IS II : AFMA @ 70 = 0, AFMA @ 200 = 2
70-200 f/2.8L IS II + 1.4x III 98 (70 * 1.4)  = -1. AFMA @ 280 (200 * 1.4) = 4

 I had forgotten the need to perform AFMA on the lens/TC combination - when shooting a cricket match recently, I found that there was front-focus when using the 1.4x III that wasn't there using the bare 200 lens.

Cheers

[Mencho(22)]

70-200 f/2.8L IS II : AFMA @ 70 = 0, AFMA @ 200 = 2
70-200 f/2.8L IS II + 1.4x III 98 (70 * 1.4)  = -1. AFMA @ 280 (200 * 1.4) = 4

 I had forgotten the need to perform AFMA on the lens/TC combination - when shooting a cricket match recently, I found that there was front-focus when using the 1.4x III that wasn't there using the bare 200 lens.

Cheers

Can you please tell me what distance did you set your camera when doing AFMA with your 70-200?

Thanks.

Mencho

[thebowtie]

an you please tell me what distance did you set your camera when doing AFMA with your 70-200?

Thanks.

Mencho

Hi Mencho,
for the plain lens, I used the recommended 20-50x focal length rule. For 70mm I used 4.2m (60x), for 200mm I used 6.8m (34x) - that's all the room I had in my backyard.

When I attached the 1.4x, I did the AFMA at about 9.3m - 33x (I had to put the target at the end of the yard, and the camera in the house, shooting through the open door.

HTH

[Mencho(22)]

an you please tell me what distance did you set your camera when doing AFMA with your 70-200?

Thanks.

Mencho

Hi Mencho,
for the plain lens, I used the recommended 20-50x focal length rule. For 70mm I used 4.2m (60x), for 200mm I used 6.8m (34x) - that's all the room I had in my backyard.

When I attached the 1.4x, I did the AFMA at about 9.3m - 33x (I had to put the target at the end of the yard, and the camera in the house, shooting through the open door.

HTH

I am trying to honor the 50x focal lenght with all my lenses... Besides I have doubts with focal lenghts larger than 200mm.

For a 300mm ... microadjusting at 15mm seems to be a lot.