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(More customer reviews)Two tricks make this adapter really useful and versatile: a step-down converter ring, and one simple Photoshop adjustment.
It converts my 28mm equivalent lens to what I roughly estimate is a 21mm lens--a big increase in angle of view.
I got one of these adapters for my Olympus micro 4/3 camera, to try out as an alternative to a $600 true wideangle.
The big problem is substantial barrel distortion. Also, there is chromatic aberration in the corners and some vignetting (darkening in those corners). Now, here's the trick: Photoshop Elements (and, no doubt, other photo management programs) can eliminate the barrel distortion in: Filter/Correct Camera Distortion/Remove Distortion (try +20 to +30%). This has the huge additional benefit of pulling the corners out of the picture without reducing the wide angle of view--the very corners where both the chromatic aberration and vignetting occur! Crop to make the picture rectangular, and you have reduced all 3 problems significantly with this one adjustment.
Now, you still are not getting top quality. But for the ridiculously low price of this lens you are getting 50% or more of the quality at a twentieth of the price of a "real" ultrawide.
FItting the adapter to your lens: I use a Digital Concepts adapter on my micro 4/3 14-42mm lens (28 mm equivalent at wide angle). I have to say that the lens' focus mechanism struggled to work--the motors on this tiny lens must be too weak to move the added weight of this adapter--and I therefore found it best to use manual focus. Other cameras may not have this issue. I actually used Digital Concepts' "0.45X Professional 43mm Wide Angle HD Lens with Macro" which has a 43mm screwthread, closer to my specific need, and I had to also buy a 43 to 40.5mm stepdown ring. The adapter on this page, for the "Olympus Evolt", has a 58mm screwthread, which fits the 4/3 (not micro 4/3) lens. The same Digital Concepts lens adapter is sold on Amazon fitted with a variety of other screwthread sizes.)
Click Here to see more reviews about: Wide Angle / MACRO Converter Lens for Canon EOS 18-55mm and Olympus Evolt 14-42mm
Digital Concepts Professional 0.45x Super Wide-Angle and MACRO Combo Lens.No adapter needed -the 0.45x Combo Lens has 58mm rear threads and screws directly onto your Canon EF 18-55mm or Olympus Zuiko 14-42mm "Kit" lenses or ANY lens with a 58mm filter mount.The 0.45x Wide-Angle dramatically increases your wide-angle range. Fit the entire family or the whole team into the picture. Multi-Coated Optics and Steel Barrel construction will provide years of use and enjoyment.Lens is High-Speed and Infra-Red compatible. Can be used Night or Day.Front filter size is 62mm for attaching other accessories.PLEASE NOTE: Your lens front filter size MUST be 58mm (although "stepping rings" can be used to mount to other filter sizes).Includes MACRO Lens for Close-Up FocusMacro Mode is accomplished by unscrewing the front lens assembly and using only the section labeled MACRO with your existing lens.

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