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Thread started 06 Feb 2018 (Tuesday) 14:13
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Canon Extender II

 
John ­ Sheehy
Goldmember
2,265 posts
Joined Jan 2010
Feb 08, 2018 14:42 |  #16

00derek wrote in post #18559418 (external link)
I don't own any extenders but I was considering the Canon 2X (II or III) - I had heard tales of it losing AF and wanted some advice. In a previous post on POTN I was told it loses AF at 400mm, but I can see from the discussion here that it's about the aperture not the focal length. A TC may work better at the minimum zoom than maximum, but I'm sure no one bolts on a TC to shoot at 200mm with a 100-400 zoom.

My body is a Canon 5D mk IV.

Sounds like 1.4X III is the one I should be looking into.

Thank you all.

That's a good first step. You might be more inclined to use it than a 2x. A 2x needs a faster lens to AF well (if at all), and if you want AF, a 1.4x will work with more equipment and circumstances.




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cristphoto
Senior Member
846 posts
Joined Feb 2010
Maryland
Feb 08, 2018 16:15 as a reply to post 18559418 |  #17

On my 5D4 if I use the 100-400 with the 1.4 extender (ver2) I have 9 focus points still available. When I use the same lens combination on my 5D3 or 1D4 I only have the center focus point available. If at all possible I would stay clear of the 2x converters. First because you lose af on most (not all) lenses. Second image quality drops off much more than when using the 1.4 tc's. Hope this helps.


5D MKIV, 5D MKIII, 1D MKIV, 24L II, 35L, 50L, 85L II, 100L Macro, 135L, 300LIS, 16-35L, 24-70L, 70-200LIS, 100-400LIS

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CyberDyneSystems
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Post has been last edited 14 days ago by CyberDyneSystems. 2 edits done in total.
Feb 08, 2018 16:46 |  #18

With the 5D4, you will get usable AF with either the 1.4XII or III
You will not get any AF with the either 2X.

If you use the 1.4XII you will get a small group of 9 usable AF points in the center. If you use the 1.4X III you get all AF points :)

With the latest lens and body, like you have, it really will be worthwhile going for the version III.


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00derek
THREAD ­ STARTER
Member
Joined Dec 2012
Mesa, AZ
Feb 09, 2018 18:18 as a reply to CyberDyneSystems's post |  #19

ordering the 1.4x III in 3,2,1....




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Snydremark
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Issaquah, WA USA
Feb 09, 2018 19:52 |  #20

00derek wrote in post #18559418 (external link)
I don't own any extenders but I was considering the Canon 2X (II or III) - I had heard tales of it losing AF and wanted some advice. In a previous post on POTN I was told it loses AF at 400mm, but I can see from the discussion here that it's about the aperture not the focal length. A TC may work better at the minimum zoom than maximum, but I'm sure no one bolts on a TC to shoot at 200mm with a 100-400 zoom.

My body is a Canon 5D mk IV.

Sounds like 1.4X III is the one I should be looking into.

Thank you all.

Correct; if you want AF w/ the TC, you need a 1.4. For best results, the MkIII is your target. I use the Mk III 1.4 w/ the newer 100-400 on occasion, w/ the 7DII and it works relatively well. I don't bother with flying things as it's too slow even then, but it works ok for stationary or slower moving, ground targets.


- Eric S.: My Birds/Wildlife (external link) (7D MkII, Canon 10-22 f/3.5-4.5, Canon 24-105L f/4 IS, Canon 70-200L f/2.8 IS MkII, Canon 100-400L f/4.5-5.6 IS)
"The easiest way to improve your photos is to adjust the loose nut between the shutter release and the ground."

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TeamSpeed
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Joined May 2002
Northern Indiana
Feb 09, 2018 20:28 |  #21

Bassat wrote in post #18558990 (external link)
I mean that it is way too slow to be of any use for moving targets, and way too inaccurate to use for stationary targets. As in: may as well not have it. It tries, it even locks and beeps, but the targets are not in focus. As in: it doesn't work.

The Kenko 1.4x worked pretty well with the 100-400L when I had that lens. I would often run the 1.4x at the zoo on the lens, and on a nice day, it did well, AF locked on, etc. All with the older bodies too, because either I taped the 3 reporting pins, or the TC didn't report, I don't remember which.


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