That's actually quite cool.
Olloclip three-in-one lens
So Apple’s surprise non-announcement last week still made your original iPhone 4 feel a bit less special? Well, before you ditch and switch, maybe this is the alternative: bling up! Olloclip three-in-one lens accessory for iPhone Olloclip is a three-in-one lens attachment that adds plenty of extra zing to the iPhone 4’s …
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Tuesday 11th October 2011 12:58 GMT Some Beggar
Bleary smeary yuck yuck.
Barrell distortion and smeary horror is pretty much inevitable with these sort of extension/adapter lenses. You can get away with a macro extension but widening the field of view is an optical nightmare when you already have a lens between you and the film/sensor.
(imagine I've inserted a back-of-envelope ray diagram here)
See? Nightmare. The only way to make a decent wide angle adapter is to take a drill and remove the existing lens first.
The fisheye gets away with it because it embraces the distortion.
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