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Canon EF 500mm f/4.0L IS II USM

Started Nov 29, 2013 | User reviews
Schwany
Schwany Forum Pro • Posts: 10,169
Re: Canon EF 500mm f/4.0L IS II USM

BigBen08 wrote:

Aurangabadkar wrote:

My 500 II + 1.4 TC III works very well on my 5D3 with grip, better than 7D with grip. I believe this could be due to the better AF system of 5D3.

I was using my 1D4. Could be that I had some issue with the camera, lens and tc playing well together.

Read it a weep. Extenders and super telephotos

http://learn.usa.canon.com/resources/articles/2011/updates_supertelephoto_article.shtml

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NancyP Veteran Member • Posts: 6,608
If you need the reach, use the TC

It gives better image quality than with cropping. Purists will shudder at some photos of George Lepp's one-time set-up, showing an 800mm with multiple TCs and extension rings, used to capture a very distant eagle's nest with ~3,200mm equivalent f/zillion lens.

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NancyP

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BigBen08 Veteran Member • Posts: 7,473
Re: Canon EF 500mm f/4.0L IS II USM

Schwany wrote:

BigBen08 wrote:

Aurangabadkar wrote:

My 500 II + 1.4 TC III works very well on my 5D3 with grip, better than 7D with grip. I believe this could be due to the better AF system of 5D3.

I was using my 1D4. Could be that I had some issue with the camera, lens and tc playing well together.

Read it a weep. Extenders and super telephotos

http://learn.usa.canon.com/resources/articles/2011/updates_supertelephoto_article.shtml

I've read this article before. But if you go to page 9, it says this...

As with previous EF Extenders, usage of Series III EF Extenders lowers AF drive speed to improve AF performance. When Extender EF 1.4X III is used, AF drive speed is reduced by 50%. When Extender EF 2X III is used, AF drive speed is reduced by 75%. This may seem like a drawback, but in reality subject tracking performance remains quite high when Series III Extenders are used with IS II lenses. This is due to improvements in AF precision made possible by the new microcomputer in the extenders.

So lower AF drive speed = improved AF performance. This does not compute.

Perhaps it means lower AF drive speed = improved AF accuracy.

I don't know, I can only guess. Maybe I should have tried the version II tc on the 500 II.

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