tele-foto+close-up filter?


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noob117

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Oct 16, 2006
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west
#1
i tried to use a +3 diopter hoya close-up filter on a sigma 70-300 APO
but the thing is, it cannot focus or have sharp focus on the object...
:dunno: :dunno: espercially on the tele-end.
or is there something wrong with my lens?

 

DeSwitch

Senior Member
Oct 28, 2005
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www.flickr.com
#2
You should know that with the closeup filter you will no longer be able to focus at infinity. yr focusing distances had beed changed (reduced)
 

noob117

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Oct 16, 2006
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west
#4
but strange thing is it works sharp on my 18-55mm kit lens?
 

wong1979

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Aug 16, 2005
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#6
Did u focus at around 33 cm? Need to use 1000mm / (diopter) formula to get it right. In your case, 1000/3 = 333mm or 33.3 cm.
 

Artosoft

Senior Member
Aug 31, 2005
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Tanjong Katong
#7
Did u focus at around 33 cm? Need to use 1000mm / (diopter) formula to get it right. In your case, 1000/3 = 333mm or 33.3 cm.
Additional info: That's 33.3mm is when the lens' distance set at infinity. No matter of focal length of the lens.

Regards,
Arto.
 

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