close up filter


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hacknet

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Mar 20, 2007
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#1
hey guys!

i've just got my sigma 70-300mm. i'm hoping to take macro shots with it and i've done alittle playing around with the lens.

i'm thinking of shortening the min focusing distance. i know one cheap way around it would be using close up lenses. i'm thinking of getting a cheap +2 or +4 close up to try it to see how it works out

the sigma focuses to 1.5m on normal mode and up to 0.95m on macro mode. if i were to use a +2 or a +4 closeup, how much close can i get?

thanks guys!
 

noob117

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Oct 16, 2006
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west
#2
i not sure how much closer.
but i think IIRC the size of the image is like
+3 diopter so the object is 3X bigger :)
 

hacknet

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Mar 20, 2007
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#3
oh.. that sounds good, i was under the impression that i would have to get closer to the object to get more magnification..
 

Artosoft

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Aug 31, 2005
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Tanjong Katong
#4
i not sure how much closer.
but i think IIRC the size of the image is like
+3 diopter so the object is 3X bigger :)
Wrong concept.

+3 diopter mean you use plus (magnifier) filter with its focus point (focal length) of 1/d=3 meter(s) or 33.33cm in front of your lens. The maximum focus distance become 33.33cm (when the lens's focus distance is set to infinity).

Regards,
Arto.
 

hacknet

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#5
hmm.. i think i will have to try before i can say anything. i dont know if its worth it adding a cheap close up on my 70-300mm...
 

noob117

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Oct 16, 2006
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#8
hi TS have you tryed the close up filter on your sigma 70-300 already?
i would to konw if it is good anot :)

cheers
 

Dream Merchant

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Jan 11, 2007
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#9
No zoom, even some exotic German apo zoom costing 8 or 10k can ever match a dedicated prime macro lens.

Having said that, a close-up filter is a great (and cheap!) way to get into the world of close-ups, or 'macros'. On a zoom lens, the convenience is at least doubled over a prime in that you have the option to change the size of the object on the sensor without having to physically move to and fro.

Lots of purists will tell you that you won't get great quality with a zoom and a CU filter. But thereagain, those purists are not paying for your equipment nor are they your clients (if you're shooting for $$$).

Just try it out and most importantly, have FUN!
 

ExplorerZ

Senior Member
Jan 9, 2006
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hkchew03.deviantart.com
#10
No zoom, even some exotic German apo zoom costing 8 or 10k can ever match a dedicated prime macro lens.

Having said that, a close-up filter is a great (and cheap!) way to get into the world of close-ups, or 'macros'. On a zoom lens, the convenience is at least doubled over a prime in that you have the option to change the size of the object on the sensor without having to physically move to and fro.

Lots of purists will tell you that you won't get great quality with a zoom and a CU filter. But thereagain, those purists are not paying for your equipment nor are they your clients (if you're shooting for $$$).

Just try it out and most importantly, have FUN!
well, believe it or not. I tried sigma 70-300 with either Hoya +4 and Nikon 4T (One of the best CU filter) and results ain't good.
 

Dream Merchant

Moderator
Staff member
Jan 11, 2007
9,659
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#11
well, believe it or not. I tried sigma 70-300 with either Hoya +4 and Nikon 4T (One of the best CU filter) and results ain't good.
Could be. I guess it all depends on the inherent quality of the zoom lens in the first place. If it's really bad, then no matter what one uses - CU filters, extension tubes etc results still won't be so good. Sometimes, it also depends on how the user optimises use of the lens (sweet spot, sweet focal length, sweet apeture, lighting techniques etc).

CHEERS!
 

megaweb

Moderator
Staff member
Jan 17, 2002
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East
megaweb.clubsnap.org
#13
i not sure how much closer.
but i think IIRC the size of the image is like
+3 diopter so the object is 3X bigger :)
Dun think +3 diopter give 3x bigger magnification

Using a closeup filter, magnification depend on focal length and diopter value.

Click here to read the macro FAQs
 

Esuper

New Member
Oct 13, 2006
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#14
Try using Dual close-up +4. give u a better result.
 

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