0.45, 0.3, 0.5, WTF?

[DJL 232]

And between manufacturers this means nothing. So what is the industry standard for explaining the differences in refraction?

"I encourage all awesome dangerous behavior." - Jeffro Fincher

[lewmonst 0]

So far I find it works best to put the lens on the camera and look and the field of view. The numbers aren't comprable because there is no standard in the industry. Each manufacturer determines their own standards, focal lengths, etc... In general, smaller numbers are wider, we all know that, but only compared to lenses of the same manufacturer. Sony's are way wider than Kenko. A sony .6 is close to a kenko .42.

http://www.exitshot.com

[quade 3]

Ya know what we need on this forum . . . a manufacturer's rep to explain themselves.

quade -
The World's Most Boring Skydiver

[piisfish 135]

people from Waycool do post here... Would be nice to know what system they use.

scissors beat paper, paper beat rock, rock beat wingsuit - KarlM

[quade 3]

I, uh, realize that.

quade -
The World's Most Boring Skydiver

[mr2mk1g 10]

I'm quite happy to be corrected on this one but um... I would hazzard a guess that some of the skydiving related lens manufacturers probably don't actually make the lens themselves but buy them in and brand them...

I'm only guessing here but... given the number of places you can find "low profile" 0.3 and 0.5 lenses, all of which look absolutely identical, and cost within a few bucks of one another, I would suspect we're looking at probably 1 manufacturer that supplies everyone.

If that is the case they may not be able to help us with details on exactly how they come up with the numbers on the box.