# Macro Filter VS Close-up Filter?

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#### aspire

##### New Member
Hi all, i would like to know wat is the :

1) difference between a close up filter and a macro filter.

2) number behind a close up filter (eg. +4)

3) how to use them?

#### kirayamato

##### New Member
close up filter +4 means it has a diopter rating of +4
if u are talking abt it in hoya terms
macro filter is actually a close up filter with diopter rating of +10

arhmm can try a few books at orchard library, the photography section, got a few good books on macro photography which also touches quite a bit of close up and macro filters.

essentially they help reduce the minimum focusing distance between the object and ur lens.

can give u a few links, hope it helps

http://www.livingroom.org.au/photolog/tips/macro_digital_photography.php
Macro Digital Photographyhttp://homepages.ihug.com.au/~parsog/photo/macro.html
Macro Photography for Beginners

second link is the site that got me into macro photography

hope it helps
good luck

#### megaweb

##### Moderator
Staff member
aspire said:
1) difference between a close up filter and a macro filter.

2) number behind a close up filter (eg. +4)

3) how to use them?
1) They are the same, dfferent vendor calls them differently.

2) 3)
FL = focal length
CU = Close Up
Diopters are the optical strength of the CU lens. Its focal length can be calculated by using FL = 1000/Diopters. This is also the distance that will now be in focus when the lens is focused at infinity. (A +2 diopter will bring a subject at 1/2 metre {500mm} away into focus.)

To estimate minimum focus distance convert the camera lens minimum distance to diopters and add it to the CU lens strength. So a +2 CU lens used with a lens that focuses to 1 metre will act (approximately) like a +3 CU lens and bring a subject at 1/3 metre into focus.

Another approach is to calculate magnification. Convert the diopter strength to millimeters focal length (CU FL = 1000/Diopters). Then divide the camera lens FL by the CU lens FL to get the magnification when the lens is focused at infinity. Thus a +2 CU is 500mm FL. If you use it on a 50mm lens you will get 1:10 life size. The same +2 on a 300mm lens will give you 0.6 of lifesize (1:1.66).

http://xoomer.virgilio.it/ripolini/Close_up.htm
http://www.toledo-bend.com/gallery/index.asp?request=diopter
http://www.angelfire.com/ca/erker/closeups.html

#### aspire

##### New Member
thanks guys, sounds kinda chim to me... haha
looking hard. i like to see things closly haha... guess its studying time!!! =)

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