Wayne DeWitt , Dec 22, 1999; 12:10 a.m.
You must have a point - I don't know what it is though. We tend to leave the "actual" aperture to the astronomers and the astrophotographers (I don't care if my 200mm f/4.0 lens has a 50mm aperture) - they care more than most other photogs. I guess we could all start saying "effective aperture" if it would make you happy. I would rather you spent your time explaining "t-stops" to people (it would help them to understand why a 5" 1000mm mirror isn't the same as a 5" 1000mm refractor), it would be more educational with regards to actual earth-bound photography. We use many misnomers in everyday language, it's just one more.