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Hi Andrew, using that formula of 5x (the video says even up to 6x or 7x) the pixel size for the 60D I get: 5x 4.3= f 21.5. With the natural focal length of 4.8, I should need a 4.5x barlow to acheive this. Why then am I getting better results with a 3x barlow than 4x (two 2x barlows joined)? Something to do with the magnification factor in movie crop mode? Or would a proper 4x barlow or powermate be better than joining two 2x barlows together?
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