I post too Much on Here!!
- Jul 21, 2010
Rounding 14.8mm to 14mm would, IMO, be unethical. However, it's important to note that specific lenses are not patented, optical formulae are, and also that most patents contain many such formulae so it may be the one you've seen that looks like a 15-35/4 is not the one on which this 14-35/4 lens is based. Nor is it a requirement that a lens be based on a patent.3) How wide is the 14mm? You may think that's a bit of an odd question, but according to the patent, the actual focal length was 14.8mm, so calling it 14mm is being a little generous.