What does the "0.20X" mean in the description of a fisheye lens? 10 POINTS BEST ANSWER!!?
Posted by admin | Under Canon EOS 50D Digital SLR Monday Mar 8, 2010I 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.
Yes it does only pertain to fisheye
.20x means it has that much fisheye distortion
.40x or .42x would have more fisheye distortion than the .20x
References :
It’s the magnification factor.
Just like a 500mm telephoto lens can be called a 10x lens, making things 10x larger than a standard 50mm lens, a 0.2x lens will give you 0.2x the lens it’s on….on a 50mm lens it is the equivalent to a 10mm lens.
The lens attachment on a short zoom will give you an extreme wide angle to fisheye zoom which makes it much more useful than a fixed fisheye (look at the customer pictures).
References :
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.
References :