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PostPosted: Wed Feb 12, 2014 5:28 pm 

Joined: Mon Jun 25, 2012 11:34 am
Posts: 21
Location: Lincolnshire UK
Hi all, I need your help, I've been into photography for nearly 3 years now and collected a few lenses and bits and bobs etc etc.

I now have a Canon EF 100-400mm 4.5-5.6 L series IS lens.

So my question is, will a Canon EF 1.4x or a 2x Extender work with this lens, I've googled and You tubed till I'm blue in the face but I can't understand the terminology as I'm still fairly new to photography and only get out with the camera a few times a year..

I've heard the auto focus won't work and I'll lose a few F/stops but I don't understand the F/stop bit.
I wanted to use the extender with the 400mm lens at Airshows this year but I also like my wildlife..
So could someone PLEASE help me out and tell me yes or no whether these extenders (which one if any) will work with my lens, and any pro's and cons, its doing my head in as I can't get a straight answer.

Ps I have a cropped sensor Canon 550D if that helps ??


Entry Level Canon 550D
EF-S 18-55mm Kit Lens
EF-S 55-250mm Lens
Manfrotto 290 Tripod
Nd Filters 2, 4, 8
UV Filter

PostPosted: Wed Feb 12, 2014 6:26 pm 
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Joined: Tue Jan 04, 2011 7:58 pm
Posts: 831
Location: United Kingdom
Your 100-400mm L will still work with the extenders but you will lose your autofocus as you read. You tend to lose AF with the extender when the maximum f/stop is 5.6 or smaller with the extender reducing the aperture even further, it looks less than likely that you'll keep AF.

Those extenders work best on f/2.8 lenses as you'd stop down to a maximum of f/4 and f/5.6 with the 1.4 and 2.0x extenders respectively and maintain your AF. However you could still use the 1.4x extender on an f/4 lens and keep the AF.

With the extenders, you will lose some image quality but if you've got good glass in front of it, you may not even notice.

DSLRs: Canon EOS 7D Mark II, Canon EOS 70D
CSC: Canon EOS M3
Lenses: Canon EF-S 15-85mm f/3.5-5.6 IS USM, EF 50mm f/1.8 II, EF 100-400mm f/4.5-5.6L IS USM, Canon EF-M 18-55mm f/3.5-5.6 IS STM, Canon EF-M 22mm f/2.0 STM

PostPosted: Fri Feb 14, 2014 3:18 am 
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Joined: Mon Dec 11, 2006 7:01 am
Posts: 1173
Location: bit east of Melbourne
I have got a 1.4 Kenko converter and it works on the 70-300L , it should also work on the 100-400L, don`t see any reason why it wouldn`t. But if my experience on the 70-300L is anything to go by I wouldn`t bother using it, auto focus will be much smaller and image quality drops of. Be better to just use the 100-400L and focusing on getting the best possible pictures with that alone.

Canon Powershot S95, Canon 6D,7D, Canon 40 2.8 STM, Tamron 24-70 2.8 VC, Canon 17-40 L, Canon 15-85, Canon 85 1.8, Sigma 30 1.4, 50mm 1.8, Canon 100 2.8L Macro, Canon 70-300L +Kenko 1.4 Pro 300DGX, Canon 430EX II and RS 4 Classic

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