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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 16 Apr 2012 (Monday) 14:05
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Is it pointless to buy a 1.4x teleconverter for 400mm f/5.6 lens?

 
chrisr09
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Apr 16, 2012 14:05 |  #1

Since I will lose an f stop and autofocus, I'm wondering if I'm wasting my money in buying the Kenko Teleplus PRO 300 DGX 1.4x AF Teleconverter for my 400mm f/5.6 lens? I can shoot in bright light if that makes a difference. I would like the added reach but not at the cost of IQ. Talk me into it our out of it! Thanks.


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cdo221
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Apr 16, 2012 14:15 |  #2

You can tape some of the pins on the Kenko 1.4x so you don't lose autofocus, if that helps sway you one way or other.


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nightcat
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Apr 16, 2012 14:21 |  #3

When you use a teleconverter you'll always lose IQ, that's nothing new. I can say that I have the Canon 1.4 extender and occasionally use it with my 400mm 5.6. I'm usually surprised with how good the results are.




  
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ejenner
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Apr 16, 2012 14:28 as a reply to  @ nightcat's post |  #4

Considering what you're going to have to pay for more reach, it might be worth it, particularly the II rather than the III.

I don't have the 400 5.6, but it is very likely that you will do better by using the 1.4x than cropping.

You will probably also be able to use contrast-detect focusing if that helps (it's what I do with the 70-200 f4 + 2xTC). It does OK if the subject is not moving much (slow, but accurate still).


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gocolts
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Apr 16, 2012 14:38 |  #5

cdo221 wrote in post #14275682 (external link)
You can tape some of the pins on the Kenko 1.4x so you don't lose autofocus, if that helps sway you one way or other.

I did this. AF worked 90% of the time in outside lighting, and results were better then they had any right to be considering the "workaround" of taping pins etc. Not bad at all for 560mm.




  
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1Tanker
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Apr 16, 2012 14:43 as a reply to  @ ejenner's post |  #6

I would definitely go for it. As ejenner noted, any other option for more reach will cost you over a $1000(Sigma 150-500OS) or the next-cheapest route being a 300L f/2.8 with 2x TC. You can also use the TC on your macro lens, if you want.. i often use the 1.4x on mine. Gives you 1.4:1 mag. ;)


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Madweasel
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Apr 16, 2012 15:15 |  #7

I have used the 1.4x II on my 100-400L with good results, and the prime should be better than that. I don't bother trying to fool the camera, just focus manually. I guess it depends on the subject and lighting.


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sloanbj
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Apr 16, 2012 16:44 |  #8

I use the Kenko 1.4 on my 100-400 at all times. Autofocus is fine - no pin taping. Results are sharp enough for me. Here is a recent example.

http://www.flickr.com …6937411020/in/p​hotostream (external link)

At 560mm depth of field is pretty narrow even at f8.


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KT29
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Apr 16, 2012 18:04 as a reply to  @ sloanbj's post |  #9

Auto focus works fine on my 400 F5.6 with the Kenko 1.4 300DGX without any taping.
Here is a pic at F8.0. This shot was hand held. Always nice to have the 1.4 in the bag when you need it.:)

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IMAGE IS A REDIRECT OR MISSING!
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Terry

  
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chrisr09
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Apr 16, 2012 18:59 |  #10

Thanks, everyone, for your replies. I think I'll take the plunge on the Kenko since it's a decent price.


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N.V.M.
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Apr 16, 2012 19:15 as a reply to  @ chrisr09's post |  #11

i have the Canon 1.4 III and the Canon 400mm f/5.6. here's my thoughts. IQ is slightly "degraded", no doubt, but its still very good, and its a grittier kind of quality. it's quite nice, actually.

i can't speak for the Kenko, but i always read/hear that the Canon 1.4x II is as good, and much cheaper than the version III i splurged on.

the upside is, that you get shots you wouldn't be able to get. AF is also not affected. couple of samples:

[IMAGE TOO SMALL, NOT RENDERED INLINE]

[IMAGE TOO SMALL, NOT RENDERED INLINE]

[IMAGE TOO SMALL, NOT RENDERED INLINE]



  
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Apr 16, 2012 19:48 as a reply to  @ N.V.M.'s post |  #12

IMAGE: http://farm8.staticflickr.com/7201/6928666162_8313a511ea_b.jpg

Canon 100-400mm with Kenko Teleplus PRO 300 DGX 1.4x AF shot at 560mm. I love it, takes a little getting used to. AF is fine as long as you have good light. IQ just a hair off from 100-400.

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pyro1
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Apr 16, 2012 19:51 as a reply to  @ pyro1's post |  #13

IMAGE: http://farm8.staticflickr.com/7067/6906394512_d271d17e6a_b.jpg

This also shot at 560mm with the Kenko off a tripod. I'm happy with the combo!

Twin 1DX, 5D mk III - EF 16-35 f/2.8L II USM - EF 24-105 f/4L IS USM - EF 70-200 f/2.8 L IS USM II - EF 100-400 f/4.5 L IS USM - EF 100 f/2.8 L Macro IS USM - EF 85mm f/1.2 L II USM - Tam 24-70 f/2.8 Di VC - 580EXII - Einsteins & CyberSync System - Vagabond Mini -
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SVTmaniac
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Apr 16, 2012 20:29 as a reply to  @ pyro1's post |  #14

Other than shooting the Moon I rarely use my 400 5.6 with a TC but I did get one OK shot with it once. Little soft but I found it difficult to hit focus on the 7D manually.

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jhayesvw
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Apr 17, 2012 00:29 as a reply to  @ SVTmaniac's post |  #15

Ive used my Kenko 1.4 MC4 DGX on my 100-400 before.
The results are pretty close to what I get when I just crop it, so I threw it in my camera bag and it has sat there for a few months.
I think on a prime it would be better, but the decrease or loss of AF isnt worth it to me.



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Is it pointless to buy a 1.4x teleconverter for 400mm f/5.6 lens?
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