Summary: amazing for the price

Comment: I bought this for my Canon Rebel XTi. I usually use it on the 18-55 lens, and it works beautifully!! And the price can't be beat! The only thing is that it makes the lens so long that it gets in the way of the flash that comes with the XTi - if I need to use flash I have to use a mounted flash. Other than that, I've had a blast using this lens.

Summary: Best Dollar for Dollar

Comment: Very Simple to use Great Dollar for Dollar compared to more expensive Full fisheye lenses

Summary: Wide angle only a little better

Comment: The Opteka provides only a minor increase in the angle width and no "fisheye" effect.

Summary: Not quite worth its cheap price

Comment: I thought it would be fun to try a fish-eye lens (or a semi-fisheye). This sort of works OK, but the optics and image quality is very poor - quite fuzzy and unfocused. It's ok for small scaled (resized) down images.

Here is an example:

Note that, on my Canon 40D, the image is not fully round; part of it gets clipped at the bottom. This lens comes with an adapter for the standard 52mm lens; it will not work with the Canon EF 28-135mm f/3.5-5.6 Zoom Lens (72mm) that comes with the Canon 40D, for example.

Summary: Nada que ver !

Comment: Despues de realizar pruebas con este lente en mi Canon 40D, he quedado defraudado, nada que ver la calidad, en aperturas muy grandes es terrible las aberraciones que produce, se puede trabajar en aperturar pequeñas.. y es decente la imagen pero pesima calidad en los bordes. El Macro lo mismo , hay que trabajar en pequeñas aperturas de diafragma, 9 en adelante y de todas formas la calidad de la imagen y las aberraciones siguen allí. la verdad es que me equivoque, pero.... ya lo tengo algo haré.. quizá guardarlo indefinidamente.