Jump to content

stargazine_ep34_banner.thumb.jpg.28dd32d9305c7de9b6591e6bf6600b27.jpg

Recommended Posts

I have an Antares ND13 filter (thanks Thunderstruck) and from what I've read it has a 13% transmission, hence the name. I also have an Explore Scientific ND0.9 filter and this also has a 13% transmission. The puzzle is, why is the ND13 much darker than the ND0.9 if they have the same 13% transmission? Are they labelled up wrong? Do the suppliers not know what they are talking about? I don't really mind because it will be useful to have two different densities, it just seems quite odd. Has anyone else noticed this advertising blunder?

Link to post
Share on other sites

Photographic ND filters are rated by stops of darkening.  Thus, an ND13 should pass 1/(2**13)=1/8192 of the original light.  These are typically used for solar imaging.

A mislabeled ND filter could be very dangerous.

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.