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Comparing Canon’s MKII and MKIII Extenders

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In the Fall of 2010 Canon announced the introduction of new MKIII extenders to replace the previous MKII versions.  Super Spectra coatings were introduced to help reduce ghosting and flare as well as fluorine coating to make water spots and finer prints easier to remove.  I’ve always fond the MKII extenders to be extremely useful when used in the right circumstances so I was eager to try out the MKIII versions to see if there was an improvement. Physical differences Since the introduction of the 800mm f5.6, Canon changed their off-white color of their telephoto lenses.  All the new MKII

Canon 300mm f2.8 L IS + 2x Teleconverter – Real world usage how good is it ?

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Sometimes I get in the mood to do big technical tests on gear and lenses. I have a few of those in the works right now but for this one I’m going to keep it simple. Teleconverters have a fairly bad reputation and my first foray into their use was with my original 70-200 2.8 L IS. I picked up a 1.4x II thinking that it might be useful for getting me near the 300mm mark on the cheap. Long story short, I tried it a couple of times and then swore never to put a teleconverter anywhere near my