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Discuss and share your wildlife photography, filming and equipment
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Re: Which teleconverter to use with Canon 550D?

Unread post by jesica » Tue Oct 16, 2012 1:56 pm

[quote="DuQues"]To be honest I would recommend none.

me two, stay away from it, you drop photo quality and it takes away the fun to see how close you can sneak up on the animals
Photography shows us all the priceless moments

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Re: Canon 2x extender

Unread post by elosonegro » Wed Nov 14, 2012 8:11 am

The new Canon 2X III is worth having, great on a 70 - 200 2.8L. I wouldn't even rent the older versions.

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Re: Canon 2x extender

Unread post by PantoffelSlippers » Sat Dec 08, 2012 10:08 am


Yes-that is what it does. A 2x converter doubles your focal length but it's not worth it on most lenses.

If you have a lens that is F4.0-F5.6 it means your standard lens has F5.6 at full zoom. When connected to a converter, F5.6 becomes F11 I believe. You most probably won't get autofocus to work at all and for F11 you need a lot of bright light and/or a slow shutter speed which will probably cause a blurry picture.

I have previously used an extender on my canon 100-400mm L series lens with moderate success.

My recommendation is then: only buy an extender if you have a proper lens to use it on. Preferably a lens that has F2.8 throughout it's zoom range or maybe even F4.0.

For other lens types, I'd rent an extender. If you're in Gauteng, OutdoorPhoto in Pretoria has rental options including extenders. Their prices are good and their service is excellent. You can go the rental option to test it on your own lens as well.

Hope that helps!


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Re: Canon 2x extender

Unread post by WildImage » Mon Jan 07, 2013 12:42 pm

Hi, The best combination I have is the EF 500mm f4 L IS USM with a 1.4x converter. This gives a 700mm with a focal length before taking crop factor into account (and an effective aperture of f5.6 - so autofocus can operate). I was recently in the Lake Panic Bird Hide and two other photographers had the same lens combination but with 1D MkIII & MkIV bodies (I have recently moved up to the 5D MkIII). As an alternative I use an EF 70-200mm F2.8 L IS USM with a 2x converter (thus 140-400mm f5.6 before crop factor consideration).

One point to consider, if you can extend to it, the EOS 1D MkIII (and I assume the MkIV as well) will autofocus using the centre focus point only at f6.3. Thus the autofocus will function for the 500mm f4 plus the 2x converter. Thus, with the crop factor of the APS-H sensor, you end up with a 1300mm f6.3 lens.

Just a few more things to consider,

Richard (WildImage) - my Flickr account:

Gie me ae spark o' Nature's fire
Thats a' the learning I desire.

Robert Burns 1759 - 1796

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Re: Canon 2x extender

Unread post by elosonegro » Fri Jan 11, 2013 2:43 am

The 2x III will will autofocus on the 500 F4 as well with my 5D III but I use the rear focus button. It will also work with my 7D if I go to live view and use the rear autofocus but it's very slow.

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Unread post by moobox » Fri Jun 27, 2014 5:50 pm

Tell me people, what is the success rate with these 1.4 and 2.0 X convertors or extenders? My limited understanding of this game is that you lose some light. I have a Canon 100-400 and think maybe that's going to leave me a bit short. No? Am I looking for too much?

Cheers - Ed

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Re: Convertors

Unread post by anne-marie » Fri Jun 27, 2014 7:00 pm

I have a 100x400 and tried the convertor of my nephew... I lost almost all the stabilizer :shock:
need a been bag or even more... a tripod :hmz:
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back home...

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Re: Convertors

Unread post by yoda » Sat Jun 28, 2014 9:55 pm

Yes, you will lose at least an f stop.
You will also lose auto focus

In Kruger, 100 may be too much for animals near the road.

I have a 2x convertor and never used it for these 3 reasons.

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Re: Convertors

Unread post by JDW » Sat Jun 28, 2014 10:19 pm

Greetings all
Convertors have their place.
By adding a convertor you loss at least one stop often two, you also increase the time it takes for the lens to focus, additionally you lose shutter speed.
Using Nikon/Canon convertors on primary professional lenses ie 400mm/300mm/70-200mm can have an advantage particularly reach. Because these lenses are F2.8 the loss of one stop is not a huge problem.
I have the 1.4, 1.7 and 2x convertors but only use the 1.4 and 1.7 where movement is involved. the 2x slows the focusing down and hinders the cameras ability to lock onto the target particularly when its moving.
As far as cheaper convertors are concerned - save your money - invest in better lenses.
Just the ramblings of a pensioner
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