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I've just been running some tests comparing a dedicated cheapo macro lens (sigma 50mm 2.8 DG) against standard fifties on extension tubes (Pentax 50 1.4 & Nikon 50 1.4), whilst I wait for my custom made anti newton glass to arrive.
All were shot at f8, iso 100, the Sigma was colour corrected first and the settings copied over to the other 2 shots, the exposure was tweaked by up to 1/3 of a stop to make them more even. Quick n dirty colour correcting.
Things I noted
-Distortion, those on the tubes needed a fuck load of correction, couldn't quite make the edges straight.
- Contrast, The sigma wiped the floor with the other 2, lots more punch to the shot and micro contrast in the details
- Sharpness, eh, not a lot in it, the micro-contrast gives a much better apparent sharpness though to the Sigma
Thoughts?
