Close up filter on zoom lens


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expositer

New Member
Mar 16, 2005
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#1
Hi Guys,

Trying to use a Hoya +4 filter (52mm with a 58 -> 52 step-down ring) on a Sigma 70-300 Super II Macro lens on a Canon 350D

However, i always have problems autofocusing. Image in viewfinder always appear blur (i.e. very soft on the edges.) before i take the shot, thus the camera cannot autofocus based on that image. I understand i must set the smallest aperture available, thus i'll use the depth-of-view preview button and manual focus with it.

Any idea how to use auto-focusing in such a scenario?

Thanks.
 

Goldenstars08

Senior Member
Nov 21, 2004
1,513
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38
Singapore
#2
I using the Canon 75-300mm. Zoom to 300mm a close up +4 is too close.
Try the close up +2 or max +3... :)

For MF walk to the correct distance & then turn the focus ring until you see a sharp image... ;)
 

expositer

New Member
Mar 16, 2005
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West
#3
Hi Goldenstars,

Thanks a lot! I'll try it out to see how it goes (I realised that a +4 allows me only very very little distance to play with to get the focusing sharp).

cheers,
 

Navyblue

New Member
Apr 21, 2005
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Sembawang, Singapore
#4
expositer said:
Hi Goldenstars,

Thanks a lot! I'll try it out to see how it goes (I realised that a +4 allows me only very very little distance to play with to get the focusing sharp).

cheers,
That is how a diopter works, be it +3 or +2, the focusing distance become very limited. Their difference being, +4 enables you to focus closer than a +3.
 

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