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Which Extension Tube for EF 100mm 2.8 USM Macro?


tigerminx 10 237 South Africa
24 Nov 2006 4:43PM
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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justin c 11 4.6k 36 England
24 Nov 2006 4:52PM
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 e2
11 3.7k 2 Singapore
24 Nov 2006 5:03PM
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.
Big Bri 13 15.7k United Kingdom
24 Nov 2006 5:24PM
I've used my Jessops ext tubes with my 100mm 2.8 and a Canon 1.4x, no problem Smile
kit-monster e2
11 3.7k 2 Singapore
24 Nov 2006 5:26PM
Sad - I can't . . . but then I doubt there are any Jessops in SA.
cambirder 10 7.2k England
24 Nov 2006 5:29PM

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 e2
11 3.7k 2 Singapore
24 Nov 2006 5:30PM
Oh well - they were very cheap. Will have to check when I get home.
cambirder 10 7.2k England
24 Nov 2006 5:34PM
I'm pretty sure the Kenco ones are without nasty plastic bits as well.
justin c 11 4.6k 36 England
24 Nov 2006 6:03PM
There is no problem using Kenko tubes with a Canon 1.4X extender.

Justin.
JohnHorne 9 1.0k
24 Nov 2006 6:17PM
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
Big Bri 13 15.7k United Kingdom
24 Nov 2006 6:30PM
nasty plastic bit inside cheap extension tube + hacksaw = problem solved.

;D
kit-monster e2
11 3.7k 2 Singapore
24 Nov 2006 6:38PM
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 10 7.2k England
24 Nov 2006 7:49PM

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 13 15.7k United Kingdom
24 Nov 2006 8:05PM
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 e2
11 3.7k 2 Singapore
24 Nov 2006 8:13PM
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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