Title: Terrible optics
Product review: I had purchased this telephoto lens adapter to screw on to my Canon EF-S 55-250mm. Had it functioned well, I'd have an effective 800mm focal length (250mm * 2 (lens adapter) * 1.6 (crop sensor)).Unfortunately, the lens is terrible. It's fuzzy and produces a hazy look. At full zoom, the camera has difficulty focusing and objects look as though they're being seen through a dirty window...or cataracts. Moreover, chromatic aberrations are extreme. Blue and red fringing on both edges of any high contrast object.I've not tried this on my shorter focal length lenses, so I can't determine what the quality is for those or how much the haze is diminished. What I can say is that this is NOT good for long focal length lenses.
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