Kenko 2x teleconverter on 70-200mm f4L IS lens (pics inside)


rhino123

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Staff member
Sep 1, 2006
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#1
Today I tried to take some photos with my 70-200mm f4L lens mated with my Kenko 2x teleconverter (sure, it loses autofocus) the result is soft and really not as sharp as I would have right.

Do you guys think it is normal, or was it my techniques that was wrong. All shots are handheld by the way.

1)


Shutter speed: 1/350
Aperture: f8
ISO: 800

2)


Shutter speed: 1/250
Aperture: f8
ISO 800

For the noise... I believe it might be because I have set the ISO too high... but that is the only why I can prevent underexposed shots as it is not that bright and I cannot set my aperture any higher than f8 (f5.6 would be nice).

Hope for your help in this.
 

evilorgi

Senior Member
Nov 9, 2007
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#2
like you mentioned you did it handheld, it's not sufficient to pin the blame on the equipment. esp with a tele converter, with shutter speed of 1/250 might not be sufficient. besides, you ISO 800 might affect the sharpness too...

i will suggest that you do extensive testing. go out on a bright day, with your gear, and most importantly tripod and wired shutter trigger. set it up, focus on a stationary subject. then tk shots of it, and review those shots on a com...

if by then it's still soft, then most likely is the equipment fault!
 

2evans

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Nov 8, 2007
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#3
Could easily be shutter speed. Use a tripod and actually test it out under a controlled environments.
 

jclao

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Jun 17, 2007
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#4
Ya. That's why i sold it out cheap. not sure how the original performed.
 

Rashkae

Senior Member
Nov 28, 2005
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#5
In general, 2x teleconverters are CRUD and you lose a lot of sharpness. The 1.4x ones still do ok though.
 

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