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DPChallenge Forums >> Tips, Tricks, and Q&A >> Question about Extension Tube
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Canon EOS-5D Mark II
Canon EF 100mm f/2.8 USM Macro
 11/21/2008 06:39:32 PM · #1
Hi guys

I will appreciate if somebody can help me on this. I got an Extension Tube EF12 II, and I intend to use with my lens Canon EF 100mm f/2.8 USM Macro, now, when I mounted the extension tube together with the lens, for apperture it shows F00, what doesn that mean? how can I change the apperture when use the extension tube?

Thanks
Canon EOS-5D Mark II
Canon EF 100mm f/2.8 USM Macro
 11/21/2008 06:55:21 PM · #2
oops, never mind, I just figured out what happend, it's working now =)
Canon EOS-7D
Canon EF-S 17-55mm f/2.8 IS USM
 11/21/2008 06:58:29 PM · #3
I assume it's a genuine canon one and not a cheap one? The cheap ones don't have the electrical connectors in so you can't change the aperture. If it's a canon one make sure the connectors are clean. If it still doesn't work it sounds like it's faulty :(
Canon EOS-5D Mark II
Canon EF 100mm f/2.8 USM Macro
 11/21/2008 07:04:19 PM · #4
It's Canon, but silly me, I wasn't mounting it to the lens properly, I checked again, and it's working now!!! thanks for your help ;)

Message edited by author 2008-11-21 19:04:34.
Canon EOS-7D
Canon EF-S 17-55mm f/2.8 IS USM
 11/21/2008 07:11:39 PM · #5
cool :)
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