Full Fisheye Lens

Full Fisheye Lens
What does the “0.20X” mean in the description of a fisheye lens? 10 POINTS BEST ANSWER!!?

I am looking at buying a cheap fisheye lens adapter to take skiing with me and realized that in the description of the lens it states “0.20X Professional Super AF…” I have no idea what the .20X means. Does it only pertain to fisheye lenses? Here is the full ttitle “Opteka HD² 0.20X Professional Super AF Fisheye Lens for Canon Eos Digital Rebel XT, XTi, XS, XSi, T1i, 1D, 5D, 7D, 10D, 20D, 30D, 40D, 50D Digital Slr“.

this is the link if it helps: http://www.amazon.com/Opteka-0-20X-Professional-Fisheye-Digital/dp/B001K5R38Q/ref=cm_cr_pr_product_top

thanks and remember 10 POINTS!!!!!!!!!!!!!!!!!!!

put the X on the other side… x 0.2, and put your lens in front of it.. 18mm x0.2, and your answer is 3.6mm. The adapter will multiply the focal length of the lens you put it on by 0.2.

The 1st post has it backwards, a larger number does not increase the effect, just the opposite.

UNBOXING Free Deck + Opteka 0.43x HD² Full Fisheye + X-Grip

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