Quote Originally Posted by Sirius Glass View Post
Light meter ... phooey!

I have used this for decades [with earlier versions] with great results:

Quote Originally Posted by baachitraka View Post
Do I need to have a permission to use this exposure calculator?
I found the first version in a 1963 copy on Modern Photography magazine. Since then I has seen several variants, some by the original author, some not but all free. There are some that are plastic and are for sale on the internet.

Short answer: I do not think so.