5DIII and AF @f8 works great

Started Apr 4, 2012 | Discussions
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ArminH Regular Member • Posts: 299
5DIII and AF @f8 works great

Today I tried my 100-400 and the Kenko Teleplus MC4 (1.4x converter).

400mm = f8 and the 5DIII focus is still very fast and spot on even when using the outer points.
Much better than the 1DsIII - there only worked the central point.

... now waiting for better weather

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Birdman7
Birdman7 Senior Member • Posts: 1,052
Re: without taped pins?

Have u tried it on the canon ef400l F5.6 with the kenko or canon 1.4?
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ArminH OP Regular Member • Posts: 299
Re: without taped pins?

I used the Canon 100-400 4.5-5.6 L and the Kenko 1.4.

The 100-400 is only 5.6 at 400mm so both together are f8

I expected that the AF would not work at all since they wrote it will work only up to f5.6. My old 1DsIII was able to AF but only when I use the central point - and AF was not very fast.

Because we have very cloudy weather here I shoot @ ISO1600 and ISO3200 and the AF was very fast on all AF points.

(these are NO great shoots only some tests in the garden)

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ronm2008 Regular Member • Posts: 457
Re: without taped pins?

I thought I read that for autofocus on lenses with a range of maximum apertures, you use the largest aperture no matter what the zoom is at. Either way, 4.5 x 1.4 is still more than 5.6, so it is surprising that autofocus worked.

I wonder if the Kenko somehow confused the camera. The autofocus is not just aperture dependent, but also seems to depend on the actual lens.

Its great news that autofocus worked so well

ArminH OP Regular Member • Posts: 299
Re: without taped pins?

Yes, the 100-400 has max aperture of 4.5 @100mm.
In case it's used @400mm than the max aperture is only 5.6.

the 1.4 add's a stop to both.

... and yes, all without taped pins
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bradleyg5 Regular Member • Posts: 397
Re: without taped pins?

Wow F8 ISO 3200 and only 1/250 shutter. That's very dim, impressive it can do that at all nevermind well.

Olgierd Regular Member • Posts: 397
Re: without taped pins?

I'll tape my x1.4 and try it on 100-400. I'm very curious now.

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ArminH OP Regular Member • Posts: 299
Re: without taped pins?

Yes, as long as the bird don't move - the IS of the 100-400 works quite nice.
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ArminH OP Regular Member • Posts: 299
Re: without taped pins?

btw. this are 100% crops - the birds are not this close
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Victor Engel Forum Pro • Posts: 16,491
Re: without taped pins?

Are those out of focus roof tiles in the background of the first shot? Otherwise, it looks like the diagonal bokeh you get sometimes with a filter mounted in front of the lens.
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kevindar
kevindar Veteran Member • Posts: 4,089
Just tried it

and you are right. works surprisingly well. better than my 5d2, and definitely better than 7d. Using a taped pin kenko pro 1.4x
iso 1250, f 10

100% crop

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ArminH OP Regular Member • Posts: 299
Re: without taped pins?

Yes, these are roof tiles from the neighbors hours - I shoot out of the windows (first floor) and the birds were in my garden.
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GatanoII Regular Member • Posts: 281
yes kenko DGX will AF at F8 without tape on pins

ArminH wrote:

I used the Canon 100-400 4.5-5.6 L and the Kenko 1.4.

The 100-400 is only 5.6 at 400mm so both together are f8

I expected that the AF would not work at all since they wrote it will work only up to f5.6. My old 1DsIII was able to AF but only when I use the central point - and AF was not very fast.

I have both 2.0X and 1.4X kenko DGX and in the paper with the extenders it's written that it will enable AF with glass that is faster than F5.6 for the 1.4X extender (and F4 for the 2X)

I can confirm that with good light F8 aperture glass combination can be used with AF, even staking the two extenders

so the kenko digital circuit on purpose allows AF at apertures that canon instead will disable (i.e. F8), what it's interesting is that the 5DIII AF will work on all points at F8 even with relatively low light

ArminH OP Regular Member • Posts: 299
Re: yes kenko DGX will AF at F8 without tape on pins

Yes, while switching from the 1DsIII to the 5DIII I was afraid about this f8 AF - but now it even works better than before - great camera!

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Taikonaut Senior Member • Posts: 2,513
Re: 5DIII and AF @f8 works great

This is great news. One of the alleged limitation of the 5DIII and most likely 1DX has been overcame and possibly improved on. Even less reason to jump ship. More test is needed though.

GatanoII Regular Member • Posts: 281
Re: 5DIII and AF @f8 works great

Taikonaut wrote:

This is great news. One of the alleged limitation of the 5DIII and most likely 1DX has been overcame and possibly improved on. Even less reason to jump ship. More test is needed though.

If canon did had some F8 points in the 5DIII and 1DX with a kenko extender it could eventually AF on F11 glass combo, but F11 is extreme and we can all be happy that the new AF module works well with kenko extenders also at F8

now let's hope that canon recognize this and will enable AF also with their own extenders, i.e. upgrade the firmware and with a custom function enable/disable AF with F8 glass, sure kenko extenders are almost as good as canon for a fraction of the price, but are not sealed ...

obviously the reason to eventually jump ship (not me) is not the AF, but resolution and DR (and to some extent video), hopefully next canon camera will address this limits (soon!!!) that can't be solved that easy like using third party extenders, but at least AF is not something that will be worrying anymore

Olgierd Regular Member • Posts: 397
Works (nt)

nt

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Taikonaut Senior Member • Posts: 2,513
Re: 5DIII and AF @f8 works great

I wouldnt jump ship because of the video. Clean HDMI out on D4/D800 is joke and it is moire ridden. Unfortunately nearly all Nikon lens cannot resolve 36mp properly.

GatanoII wrote:

Taikonaut wrote:

This is great news. One of the alleged limitation of the 5DIII and most likely 1DX has been overcame and possibly improved on. Even less reason to jump ship. More test is needed though.

If canon did had some F8 points in the 5DIII and 1DX with a kenko extender it could eventually AF on F11 glass combo, but F11 is extreme and we can all be happy that the new AF module works well with kenko extenders also at F8

now let's hope that canon recognize this and will enable AF also with their own extenders, i.e. upgrade the firmware and with a custom function enable/disable AF with F8 glass, sure kenko extenders are almost as good as canon for a fraction of the price, but are not sealed ...

obviously the reason to eventually jump ship (not me) is not the AF, but resolution and DR (and to some extent video), hopefully next canon camera will address this limits (soon!!!) that can't be solved that easy like using third party extenders, but at least AF is not something that will be worrying anymore

ArminH OP Regular Member • Posts: 299
Re: 5DIII and AF @f8 works great

Now with a little bit more light it works even better - waiting for the sun!

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GordonAtWork
GordonAtWork Regular Member • Posts: 475
Re: 5DIII and AF @f8 works great How is it on tracking though ? nt
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