捕魚高手 - 試鏡片
70-200mm f/2.8 IS at 200mm, plus Canon 2x teleconverter, plus Sigma 1.4x teleconverter -->> 560mm f/8 lens. (The EXIF shows 400mm f/5.6, but I assure you it is 560mm f/8).
The camera still auto focuses, but very slow. But this is a cheap way to get a long lens.
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The photos were taken with hand holding the camera, without any support. Photos are uncropped, and you can see camera shake from frame to frame, which is expected at 560mm.