17-40L with kenko 2x teleconverter?


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Aug 16, 2008
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Choa Chu Kang
#1
thinking of getting a kenko 2x tc, will it be able to af? and will the teleconverter be able to af with a 70-200 f4 L if i get it in the future?
 

Spotter

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May 21, 2004
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#2
Quick answer: No.

Why would you want to use a 2X teleconverter on a 17-40L??

If you need the reach, use a 1.4x converter on the 70-200 f4.
 

rgy1993

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Mar 28, 2007
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#3
i dont think you can use teleconverters with anything below 70? im not too sure though...

even then i think probably stay away from the 2x converter i hear that image quality is pretty badly affected by them... the 1.4x canon ones are still decent though i think
 

Aug 16, 2008
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Choa Chu Kang
#5
so meaning it wouldnt be able to use with a 17-40L? and can the 2x be use with the 70-200?
wan to use it as i dont need that kind of telezoom for now .
 

ianwurn

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Jul 30, 2008
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#7
Erm, I think folks use teleconverters (Either 1.4x or 2x) to extend the telezoom range of the long zooms. Like the 70-200 etc..... This effectively trades aperture stops and some clarity, sharpness for reach. 200mm at the long end being extended to 280mm equivalent.....

We're probably scratching our heads (At least I am) trying to understand why you are thinking of mating the 17-40L with a 2x to make it 34-80mm and probably lose AF and some clarity along the way. If you are looking for the reach, might make more sense to invest in a mid range to long zoom ?

:dunno:
 

Aug 16, 2008
171
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Choa Chu Kang
#8
ok . what im thinking of doing is that , as im doing more wide angle's now , i can get the tc to have an extra reach and also and as i can get the 2x tc at quite a good price imo, so next time when i get the 70-200 oso can use it. but after the comments and thinking through , decided not to have the 2x tc and mayb get a flash instead.:)
 

Daedalus Trent

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Apr 15, 2008
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#9
ok . what im thinking of doing is that , as im doing more wide angle's now , i can get the tc to have an extra reach and also and as i can get the 2x tc at quite a good price imo, so next time when i get the 70-200 oso can use it. but after the comments and thinking through , decided not to have the 2x tc and mayb get a flash instead.:)
yea, the flash isn't gonna give you extra reach but it's a far wiser choice than getting a TC to put on a 17-40 :think:

Cos your gonna get a 34-80 f/8 lens, L or not, is so thrashy you can get something way better for less than $300? :dunno:
 

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