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Which Extension Tube for EF 100mm 2.8 USM Macro?

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tigerminx
tigerminx  10237 forum posts South Africa
24 Nov 2006 - 4:43 PM

Hi all, could any give some advice on the EF 12 II or EF 25 II? Not sure which one enables what, but am interested in making the purchase for the new lens?

Thanks in advance.

Bruce.

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24 Nov 2006 - 4:43 PM

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justin c
justin c  104537 forum posts England36 Constructive Critique Points
24 Nov 2006 - 4:52 PM

Both will work on your lens.
A far cheaper and even more versatile option though,IMHO is the three tube set from Kenko.

Justin.

kit-monster
kit-monster e2 Member 113685 forum postskit-monster vcard Singapore2 Constructive Critique Points
24 Nov 2006 - 5:03 PM

12mm gets you slightly closer and you loose about 1/3 stop of light, 25mm gets you even closer and you loose about 1/2 stop of light. You can use both together and get even closer.

One thing to bear in mind - it's just a tube with contacts, so the make isn't important unless you use a canon 1.4x or 2x converter. If you want to mix tubes and converters then you need the canon tubes as they don't have an internal rectangular plastic diaphragm found in third part tubes.

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Big Bri
Big Bri  1315605 forum posts United Kingdom
24 Nov 2006 - 5:24 PM

I've used my Jessops ext tubes with my 100mm 2.8 and a Canon 1.4x, no problem Smile

kit-monster
kit-monster e2 Member 113685 forum postskit-monster vcard Singapore2 Constructive Critique Points
24 Nov 2006 - 5:26 PM

Sad - I can't . . . but then I doubt there are any Jessops in SA.

cambirder
cambirder  107202 forum posts England
24 Nov 2006 - 5:29 PM


Quote: If you want to mix tubes and converters then you need the canon tubes as they don't have an internal rectangular plastic diaphragm found in third part tubes

None of those in my Jessops tubes, which I have used with my Canon 1.4 converter.

kit-monster
kit-monster e2 Member 113685 forum postskit-monster vcard Singapore2 Constructive Critique Points
24 Nov 2006 - 5:30 PM

Oh well - they were very cheap. Will have to check when I get home.

cambirder
cambirder  107202 forum posts England
24 Nov 2006 - 5:34 PM

I'm pretty sure the Kenco ones are without nasty plastic bits as well.

justin c
justin c  104537 forum posts England36 Constructive Critique Points
24 Nov 2006 - 6:03 PM

There is no problem using Kenko tubes with a Canon 1.4X extender.

Justin.

JohnHorne
JohnHorne  91023 forum posts
24 Nov 2006 - 6:17 PM

According to these tables the EF12 will allow you to get up to 1.17x and the EF25 will allow up to 1.38x life size magnification with the lens you mention.

John

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Big Bri
Big Bri  1315605 forum posts United Kingdom
24 Nov 2006 - 6:30 PM

nasty plastic bit inside cheap extension tube + hacksaw = problem solved.

;D

kit-monster
kit-monster e2 Member 113685 forum postskit-monster vcard Singapore2 Constructive Critique Points
24 Nov 2006 - 6:38 PM

The problem I have with the Jessop tubes is as follows.
Body + tube + 1.4x + lens = ok
Body + 1.4x + tube + lens = not ok

Which means I can't go for the super macro:
Body + 1.4x + tube + 2x + lens which I've seen somewhere, maybe an old EOS mag?

cambirder
cambirder  107202 forum posts England
24 Nov 2006 - 7:49 PM


Quote: Body + tube + 1.4x + lens = ok
Body + 1.4x + tube + lens = not ok

Are you sure you got that the right way round? You can only fit Canon converters to the 100mm macro if you put an extension tube between them.

Big Bri
Big Bri  1315605 forum posts United Kingdom
24 Nov 2006 - 8:05 PM

he's right you know. that's why i tried it - cos the 100mm won't go on the 1.4x. and they're both canon, so you can't blame jessops.
sorry for loss of caps. i'm just feeling lazy.

kit-monster
kit-monster e2 Member 113685 forum postskit-monster vcard Singapore2 Constructive Critique Points
24 Nov 2006 - 8:13 PM

Ok - I was lazy and grabbed my 70-200 as it was on the shelf and the 100mm was in my camera bag. The jessops tubes don't work in any combination with a converter on the 100mm macro, which is as I first thought. They do work without a converter. But apparently the Kenko ones do and so do the Canon. Hopefully with all that cleared up, Bruce can decide what he wants to get.

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