7D How bad Vignetting Tunnel Effect?? .45X 52mm Wide Angle Lens converters worth a try??

[sporty]

[h=1]Can anyone recommend the best brand that I can buy of these converters for my Canon EF 50mm f/1.8 II lens and my EF 28-135mm??[/h]
WIDE

FISH EYE

 

[Samuel H]

I have one of these, I use one element from it for my DIY LCD loupe; apart from that, it's totally useless: unbearable softness and chromatic aberrations; unless you want that effect, stay away from these cheap adapters; plastic toy lenses deliver much better IQ than this

 

[deltoidjohn]

Don't bother. It will be a waste of money.

 

[Bruce Foreman]

Never use a "converter" auxiliary "lens" on a DSLR lens. We avoided these like the plague in the old "film" days.