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Old Jul 8, 2002, 2:04 PM   #1
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Default Macro with EF 75-300 IS :-)


Saturday I bought a Soligor extension tube set of 12, 20, 36mm. It's nearly the same as the Kenko set ... metal mounts.

I was astonished about the results in combination with the EF 75-300 IS ...

... this one was taken with the complete extension of 68mm and the lens at 75mm, so the magnification is nearly 1:1. I took it handheld at 1/60 sec, f16, ISO200 and the Speedlite 420EX on a D30. Oh, and yes ... IS was switched on and the working distance was something about 100mm.

What do you think?

I also tested with the EF 28-135 IS ... magnifications up to 1.5:1 are possible with the complete tube set. But the optics are not that good ... CA can become a little problem depending on the scene.
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Old Jul 11, 2002, 11:29 PM   #2
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Its quite impressive. I have used the 500D macro lens on this lens but the DOF is very shallow. Looks like you get better DOF with the extension tube.
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Old Jul 13, 2002, 5:39 AM   #3
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Hi S.,

yes the DOF is very nice, but it might be a matter of the aperture ... I read an german article about the CRITICAL APERTURE for macro ... there have been two formulas, one for extension tubes and one for close-up lenses.

I was astonished, that it is important to use the critical aperture, which means in short, that if you use a smaller one, the image sharpness will become worse.

I recommend a Google search for "critical aperture" and hope that you'll find an english explanation including the formulas to calculate it for your setup.
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