EF 2X extender

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EF 2X extender

Postby lanner on Fri Oct 24, 2008 11:14 am

Hi Guys,

Have any of you ever tried using an extender on a 100-400mm lens? I'd like to get a little more distance with my lens but I've heard results are poor to unusable with the 100-400+ extension? I know I'll have to stop down even more if i an an extender, the lens is already at 5.6 most of the time. Buying a 500mm is out of the question now though so I'm trying to do this cheaply. Alternatively if any of you have any 500mm+ lenses you aren't needing anymore I'd be happy to take them off your hands. :) Any suggestions welcome.


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Re: EF 2X extender

Postby Malcolm on Fri Oct 24, 2008 11:52 am

I have a 1.4x converter on my 300mm F4.0 Canon prime lens and I like it but it does make the minimum F stop a 5.6 with it on. A 2x converter will cost you 2 F stops and on a Canon lens will also disable the IS unless the lens is a F 2.8 or faster. As to using it on a Zoom I can't help you there other than to suggest you take your camera into a Henry's and try it out with the 2x converter ... I did that before buying my 1.4x.
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Re: EF 1.4X extender

Postby lanner on Fri Oct 24, 2008 12:08 pm

Thanks for the tip Malcolm, if i buy it I'll probably stick with the 1.4 anyway. How is the image quality? I'm pretty sure I can rent these at Vistek so I'll try before I buy it. The only reason I asked is because I've never heard of anyone using these with a zoom, most people seem to have good results with the faster prime lenses, but it's a little out of my budget to buy a prime lens at the moment.
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Re: EF 2X extender

Postby Malcolm on Fri Oct 24, 2008 1:01 pm

The image quality is as good as without it and in fact I just read an article somewhere that using a good converter on a good prime less will generally produce results superior to cropping a shot without the converter ... I wish I could remember where I saw that article. I know what you mean about wanting a faster prime lens, I wish I had a 300mm F2.8 and then I'd get the 2x converter.
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Re: EF 2X extender

Postby MikeV on Fri Oct 24, 2008 4:08 pm

I have the 100-400 and 300f/4 and 500 f/4

The 1.4 works well on the 300mm giving you 420 plus the crop of the camera

The 100-400 does not work well with the 1.4x unless you have a 1D body and 2x would be out of the question

both extenders where meant to work with the 300mm, 500mm, 600mm prime lenses.

The 2x works very well on a tripod and best for static shots.

I did meet someone that used the 1.4x extender from kenko on the 100-400 and it autofocused. You can tape the pins on the canon extender but it's not recommended. The lens motor can burn out. I suggest some reading on this on canon forums.

I would think the cheapest alternative would be a 400mm 5.6 prime, and the 1.4 x if you want more reach.

Last edited by MikeV on Fri Oct 24, 2008 7:01 pm, edited 1 time in total.
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Re: EF 2X extender

Postby karl egressy on Fri Oct 24, 2008 4:45 pm

I have the 2x extender but used it only two times so far.
I use the 1.4 extender 90 % of the time on the 300 f4.0 and on the 500 f4.0
I had the 400 f5.6 for a few years and used it with a Tamron pro 1.4 extender with three pins taped, on the left side.
(Canon extended did not want to work.)
It was my BIG LENS.
I used it on a tripod almost all the time.
I had excellent results with it.
The autofocus focused alwas in good light situation and about 90% of the time in low light situation.
It was not any worse that my current setup. The only difference is that now I have 700 mm instead of 560 mm.
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Re: EF 2X extender

Postby Grenfell on Wed Sep 26, 2012 4:19 am

Hi .. I have a 100-400 as well as the newer mk3 2x. I have been generally disappointed. I've tried dropping to 300ish in conjunction with the 2x, hoping for better results, but it was only marginally better. Working in manual is always slower, so opportunities have been missed on many an occasion. Saying all that, I have a few captures that were acceptable, but generally the "scrap" rate is pretty high.
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Re: EF 2X extender

Postby X.. on Mon Oct 01, 2012 3:52 pm

I find the 2x IQ wise to be useable with the 100 macro, 300 F4 & 500, but you are still taking an IQ hit.
Try borrowing a 2x extender, and seeing if you can live with the results.

As mentioned if the 2x is on a lens, the lens is on a tripod. Just makes things easier. BUT then you really want to have crazy anticipation... if not shooting moon shots :P

Have you thought about trying Karls idea with the 1.4 on the 100-400? Going from 400 to 560mm with birds makes a big difference!
When I went from the 300 + 1.4 (420) to 500, it was... worlds of difference even without the 1.4 on the 500.

Don't sell that 100-400 short, it has decent range and doesn't weigh 9-12 lbs!!!
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