User talk:Nfr-Maat

From Wikipedia, the free encyclopedia
Jump to: navigation, search

Welcome to Wikipedia[edit]

Welcome!

Hello, Nfr-Maat, and welcome to Wikipedia! Thank you for your contributions. I hope you like the place and decide to stay. Here are some pages that you might find helpful:

I hope you enjoy editing here and being a Wikipedian! Please sign your messages on discussion pages using four tildes (~~~~); this will automatically insert your username and the date. If you need help, check out Wikipedia:Questions, ask me on my talk page, or ask your question on this page and then place {{helpme}} before the question. Again, welcome! Mushroom (Talk) 11:09, 29 November 2009 (UTC)

f-number[edit]

I reverted you. Aperture diameter A in terms of focal length f is A = f/N, or f-number N. Where's the error? Dicklyon (talk) 02:50, 17 December 2010 (UTC)

It is just that if N = f/A, and we are defining N as expressing something in terms of another, then N expresses f in terms of A rather than the opposite, e.g. a 5.6 f-number means that the focal length is 5.6 times the aperture diameter. Nfr-Maat (talk) 04:03, 7 April 2011 (UTC)