Extension tubes

Started 8 months ago | Questions thread
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BW man
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Extension tubes
8 months ago

I am planning to start learning macro photography but want to start with modest equipment. To that end, I bought the Canon EF 25 II tube. I'll be using it with my EF-S 18-135 lens. My question is:

Except shortening the minimum focus distance, what else will the tube change? The aperture range, the angle of view, any aberrations etc. etc. In other words, will I have to always take it off when doing regular shooting?

While I'm at it, a related question. If one uses an extension tube with a true macro lens, will it make it "more macro"? That is, if the macro lens allows 1:1, will the addition of an extension tube increase magnification further, beyond 1:1?

Thank you very much in advance!

 BW man's gear list:BW man's gear list
Canon EOS 700D Canon EF-S 18-135mm f/3.5-5.6 IS STM +2 more
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