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Old Aug 3, 2005, 11:04 AM   #1
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I'm still reviewing my options for macro. I have experimented the insect hunting (with little success so far, but I'm getting better) with my SIGMA 70-300 APO in macro mode. But the loooonnnnngggg focal length is a bit frustrating when it comes to flowers, and camera shake is unforgiving (I know, I should carry a tripod to the park). So, for a start,I was thinking extension tubes on the EF 50mm f1.8.

On the Canon specs, it says

Closest focusing dist 0.45m

Maximum Magnification x0.15

So, what length of extension tube should I use to get close to x0.5 or x1.0? And what would be the closest focusing distance then? Any references?
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Old Aug 3, 2005, 12:16 PM   #2
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Have a look at this link http://www.shutterfreaks.com/Tips/ExtensionTube.htm

Discusses most of what you are asking about.
Does not mention the light loss that occures with using extensiton tubes.

The Kenko come as a set of 3 tubes and is reasonably priced.

Also look at http://www.jimdoty.com/Tips/Closeup/closeup.html


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Old Aug 3, 2005, 1:15 PM   #3
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I just recently got 2 tubes. I found they worked well with my 100-400 zoom.
I haven't checked those links that PeterP put up, but I bet they are good.

I found that the close focusing distance varied no only with the amount of tube but also the focal length I set on the lens. I could get shockingly close.

One downside to tubes is that you can but them on bad lenses. The dedicated macro lens from Canon's and Sigma's are shockingly good. Some of the best lenses they make. It just isn't fair to compare the results from them to putting tubes on a bad lens.

You'll do better with tubes than without with the lens you have. But don't expect amazing results. Both because of the quality of your lens and just because good macro is hard to do. Much harder than you might think.

Oh, and get that tripod. To get a reasonable Depth Of Field, you need a larger fstop, which means a low shutter speed. You'll really need that tripod to get any sharpness.

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