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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 16 Nov 2010 (Tuesday) 20:54
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using a 1.4 EX on a 70-200 2.8 L

 
micdon
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Nov 16, 2010 20:54 |  #1

so I use the 1.4ex when I'm out shooting sports etc on my 70-200 2.8L IS, but is it worth throwing on for a long shot at a wedding? of skip the hassle? I know there is no right or wrong answer here, but was wondering if adding that piece of glass to my $1700 lenses degrades the quality of the captured image at all? I know it bumps the f-stop up to 4.0 as the new minimum, but other than that? pros or cons?


Mike
Canon 5d Mark II (gripped), Canon 40D (gripped) Canon 24-70mm f2.8L, Canon 70-200mm f2.8L IS, Canon Speedlite 580exII & Canon Speedlite 430ex

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Green_Tea
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Nov 16, 2010 21:10 |  #2

effects of a teleconverter:
Positive:
longer effective focal length
Negitve:
smaller effective aperture
less sharpness
more CA
slower less accurate AF

So... Yes it degrades image quality. You just need to decide if the trade off is worth it your you. At a wedding you can usually just stand close enough to shoot at 200mm. If not, with that specific lens the 1.4x and croping yield similar results. For me it would not be worth it.


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zarray
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Nov 16, 2010 23:12 as a reply to  @ Green_Tea's post |  #3

with a high MP body like the 5d2...i'd just crop. :)


5D Mark II | 5Dc |17-40 | 24-105 | 70-200 F2.8 IS | Sigma 50mm 1.4 | 580EX

  
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gasrocks
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Nov 17, 2010 09:43 |  #4

Don't you already have an idea of the IQ and light loss using the 1/4x TC on your 70-200 from sports work? Some would say it is very useable, some not. I say give it a try. Will probably yield better results than cropping the image w/o the TC/


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Savas ­ K
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Nov 17, 2010 11:36 |  #5

if it's bright out, then its worth throwing on for a long shot. The gamble could work out in your favor.




  
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twoshadows
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Nov 17, 2010 11:38 |  #6

I've learned not to use TCs in poor light...


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micdon
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Nov 18, 2010 21:13 |  #7

OK, let's take it a different direction, instead of the TC, do I throw the 70-200 on my 40D crop and gain the extra reach that way? It will only be for a few shots and like I said it is an outdoor wedding so light will not be an issue


Mike
Canon 5d Mark II (gripped), Canon 40D (gripped) Canon 24-70mm f2.8L, Canon 70-200mm f2.8L IS, Canon Speedlite 580exII & Canon Speedlite 430ex

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twoshadows
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Nov 18, 2010 21:23 |  #8

What is your intended output? web size jpgs, 8x10's or poster sized prints? The reason for the questions is that your largest output will determine if the 40d is adequate. Iow, unless you're printing out larger than 16x24 with the pics you take, the 40D should be fine. And as long as you're not going much larger than 8x10, a tc in good light should be ok.


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using a 1.4 EX on a 70-200 2.8 L
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