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Title: Limited-use supplemental lens
Review: You can't expect a lot from a supplemental lens that sells for less than $40, and with the Optica .45x lens, you get what you pay for. On my Fujifilm 9000 camera, usable focal length on the 9000's zoom lens is from about 30mm to 45mm. At 28mm, there is vignetting (dark at the corners). At more than 45mm, the corners become fuzzy, so it's not usable in the medium and telephoto focal lengths unless you're trying to simulate tunnel vision. Also, as I expected, spherical abberation (straight lines appear curved near the edges of the frame) is apparent at the all the usable focal lengths (that is, between 30 and 45mm). That's common with all but the most expensive fisheye lenses.
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