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Old 08-10-2009, 11:39   #1 (permalink)
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Smile Macro Extension Tubes

Hi All

I just purchased a set of cheap macro extension tubes to try out macro Photography and attached it to my 400D and sigma 17-70mm and I cant get it to focus (manual AF of course) and I also have an aperture of 00.
What's going on? Lol
Do I need a prime lens for it to work?

Cheers
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Old 08-10-2009, 11:49   #2 (permalink)
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Re: Macro Extension Tubes

Depends how many tubes you've put on as to how close the focus is.

If you put more than one tube on you will struggle as the focus will probably be in inches and the depth of field minute. Start with the smallest tube, my auto tubes start with a 12mm so try the nearest to that.

The reason you get aperture of 00 is because unless you got auto tubes there is no link between the camera and lens for aperture data. The camera doesn't know what lens you have on so it just displays 00 and your lens will be at its widest aperture. If your lens is 4/5.6 say as I don't know your lens then you would always have an aperture of f4 at the 17mm end and 5.6 at the 70 end.

Because you lens is always wide open it will give a massively deiminshed depth of field.

Have a play and if you get the idea I'd suggest getting a set of Kenko auto tubes or a dedicated macro lens.

For tubes go to Onestop Digital which can be found on Pixalo, they are £60 cheaper than UK prices and having dealt with them on more than one occasion they do a good job
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Old 08-10-2009, 12:15   #3 (permalink)
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Smile Re: Macro Extension Tubes

Thanks Chris H !

With the set of Kenko tubes, besides AF? will it also allow me to control my aperture? Is that why you suggested it?
My sigma 17-70mm 2.8-4.5 macro (not true macro of course) will that be a "Bonus" (since it's already got a much closer focusing distance compared to normal lense?)
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Old 08-10-2009, 12:23   #4 (permalink)
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Re: Macro Extension Tubes

Yes the Kenko tubes allow data to be exchanged with the lens and camera. They give full control of Focus and aperture.

To be honest I got mine a while back but with one thing and another haven't got round to fully experimenting yet.

Remeber though, your tubes where probably under a tenner and Kenko ones even from Onestop are £85 so have a muck about with what you have before you spend any more.

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Old 08-10-2009, 12:36   #5 (permalink)
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Re: Macro Extension Tubes

Yeah sure! Definitely will play around with these set of cheapos, I am also, in the near future thinking of buying a much cheaper alternative macro ring flash iTTL MACRO RING FLASH FOR CANON 400D 450D 500D 1000D - eBay, Flashes, Photographic Accessories, Cameras. (end time 09-Oct-09 21:41:49 AEDST) anything I should watch out for? or expect? (comparing to the more expensive Canon ring flash) not sure what your knowledge or experience in Macro equipments and such but I thought I'd ask anyway
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Old 08-10-2009, 16:28   #6 (permalink)
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Re: Macro Extension Tubes

Quote:
Originally Posted by rosecran View Post
Hi All

I just purchased a set of cheap macro extension tubes to try out macro Photography and attached it to my 400D and sigma 17-70mm and I cant get it to focus (manual AF of course) and I also have an aperture of 00.
What's going on? Lol
Do I need a prime lens for it to work?

Cheers
You won't need a prime for it to work. You'll find it easier to focus at first if you set the lens to the 70mm end, and the focus ring to it's closest setting (i.e. the opposite to infinity). Then find something close and just move in and out from it till you get focus.

The rest is as Chris H said.
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Old 08-10-2009, 17:38   #7 (permalink)
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Re: Macro Extension Tubes

For some reason Canons won't measure the exposure without a "valid" lens being attached - in this case a set of tubes that have the contacts (which will also then support AF, for what it's worth - I only use MF). This means that M42 lenses aren't instantly useable. It's a shame (and totally baffling) as both my Sigmas allow full exposure measurement - hence using M42 lenses with them.

Kenko tubes have the contacts but there are other 'clone' versions which are half the price and work as well (and are, I think, just as strong - guess which I went for!)

That macro flash looks to be very close to the Marumi macro flash - same sort of price, only a single tube and limited control. I've used the Marumi but went for the Sigma EM-140 which benefits from additional control and twin light sources

The smaller the lens the greater the magnification from adding extension tubes - I mainly use my 105mm and only occasionally my 300mm (which does allow me to 'stand off' from the subject more) - needless to say the IS doesn't work!
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Old 09-10-2009, 09:36   #8 (permalink)
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Re: Macro Extension Tubes

Put the lens that you plan to use on the camera and set the f stop to whatever you want or need. Then, press the depth of field button (it's a small black button on the lower front left hand side of the 400D), hold it down and whilst doing so, remove the lens. This locks the aperture at your desired value. Then put the lens on your macro tubes and off you go. Depending on your lens you'll probably have very little focus available and I get my shots in focus by moving the camera to and from the subject to achieve the correct focus. It's touch and go and you'll take 10 out of focus shots for every one you get just right (if you're lucky ) but you can get some cracking shots. As has been mentioned above, the focus plane will be only a matter of a few inches from the lens. I used macro tubes like that to take my shot of the leafcutter ants and they were only about 3" away.


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Old 09-10-2009, 10:44   #9 (permalink)
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Re: Macro Extension Tubes

Nice shots of those Dobbies ants Clanny.

I'm not sure you can set the F-stop on all lens without having the electronic attachment. It's ertainly true of older lens where you can set the F-stop on the lens. I've managed it with OM lens on my Canon EOS.
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