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Teleconverters/extenders

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DuQues
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Re: Canon 2x extender

Unread post by DuQues » Thu Jul 26, 2012 5:56 pm

Correct, but there are downsides to it;
- it shows all the faults of the lens.
- autofocus will be slower, or be switched off entirely
- switching it in and out can let dust onto your sensor

Have a look at this page. It is a good appraisal.
On my 100-400 I do use the 1.4, but I do not have AF then, as my 7D will not use AF above f/5.6.

But if you have a good lens (L-series) and you really need the longer lens it is a great tool.
Not posting much here anymore, but the photo's you can follow here There is plenty there.

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Geckophobe
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Which teleconverter to use with Canon 550D?

Unread post by Geckophobe » Fri Oct 05, 2012 8:20 am

I am in the process of buying a better camera (in stead of a good "mik en druk" ) for the first time, and I have decoded on the Canon 550D, the best deal I could find in my budget- and I have seen a number of good reviews also on this forum.

I am looking for a teleconverter to use with the canon 55-250 lens? Which would you recommend?
Satara : 8,9 July 2013
Lower-Sabie : 10,11,12,13, July 2013

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DuQues
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Re: Which teleconverter to use with Canon 550D?

Unread post by DuQues » Fri Oct 05, 2012 9:12 am

To be honest I would recommend none.

Your camera will use autofocus up to f/5.6. The teleconverter will take 1 (1.4x) or 2 (2x) stops of light which means that in combination with your f/4-5.6 lens you will have to use manual focus all the way.

If you decide to buy one anyway I would go for the Canon 1.4, that one does not degrade the image quality. With the 2.0 version you will see the IQ going down.
Not posting much here anymore, but the photo's you can follow here There is plenty there.

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Kicker Cat
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Re: Which teleconverter to use with Canon 550D?

Unread post by Kicker Cat » Mon Oct 08, 2012 7:59 pm

Hi Gekophobe,

The advice given so far is probably spot on - the reason is that the lens you have is a kit lense - and by the way a very superb one at that. My wife has one of those lenses with her D400 and she gets fantastic pics - in fact I have a 70 - 300 lens that is hugely more expensive and I have to say that it does not give that much better pics.

If you go to a much better lens as I feel sure you will want to do eventually then you can consider a converter and the best one is the 1.4.

Can I add - you will lose about 2 stops on the lense but in the really bright light we have here it does not make that much difference - you should be able to get really good shots - look for a photographer called Gary Parker on the web - his pics are superb and he uses a 1.4 with his 100 - 400 lense.

KR

KC

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Re: Which teleconverter to use with Canon 550D?

Unread post by Geckophobe » Mon Oct 15, 2012 12:43 pm

Thank you for the good advice. I have now actually started playing around with the new camera - taking pictures of everything I see:). It is an awesome experience! I have to admit that I have a lot to learn and I have been thinking of taking a course or two. In addition, there is so much useful info on the forum. Can't wait for my next Kruger trip which is unfortunately only in July next year! In the meantime we have atrip to Golden Gate planned-so I will have time to practice.
Satara : 8,9 July 2013
Lower-Sabie : 10,11,12,13, July 2013

EOS_User
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Re: Which teleconverter to use with Canon 550D?

Unread post by EOS_User » Mon Oct 15, 2012 1:39 pm

Geckophobe wrote:I am in the process of buying a better camera (in stead of a good "mik en druk" ) for the first time, and I have decoded on the Canon 550D, the best deal I could find in my budget- and I have seen a number of good reviews also on this forum.

I am looking for a teleconverter to use with the canon 55-250 lens? Which would you recommend?


I stand to be corrected; but I'm sure that the 55-250 will NOT accept an extender/teleconverter. It is certainly not compatible with either of the Canon options. It 'may' accept a third-party (maybe Sigma) teleconverter; but you should test that theory first before buying.

Cheers;

Lee

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timbo
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Re: Which teleconverter to use with Canon 550D?

Unread post by timbo » Tue Oct 16, 2012 1:46 pm

EOS_User wrote:
Geckophobe wrote:I am in the process of buying a better camera (in stead of a good "mik en druk" ) for the first time, and I have decoded on the Canon 550D, the best deal I could find in my budget- and I have seen a number of good reviews also on this forum.

I am looking for a teleconverter to use with the canon 55-250 lens? Which would you recommend?


I stand to be corrected; but I'm sure that the 55-250 will NOT accept an extender/teleconverter. It is certainly not compatible with either of the Canon options. It 'may' accept a third-party (maybe Sigma) teleconverter; but you should test that theory first before buying.

Cheers;

Lee


As far as I know, you are absolutely correct. The 55-250 is an ef-s lens and will not be accepted by the ef converter. Canons converters are made to work with strictly ef lenses.

But I may be getting it wrong
I try my best and that's what matters I hope.

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jesica
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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

elosonegro
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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.

PantoffelSlippers
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Re: Canon 2x extender

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

harrys,

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!

Cheers

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WildImage
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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
Richard (WildImage) - my Flickr account: https://www.flickr.com/photos/r_j_veitch/

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

Robert Burns 1759 - 1796

elosonegro
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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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