Originally posted by Uluru There is a
Pentax patent from 2012, for a 70-200/2.8 lens.
Indeed, it covers the 135 format image circle (43+ mm diagonal).
It is
not anything like Tamron.
Tamron: 70-200/f2.8 — 23 elements in 17 groups
Pentax (see diagram below): 70-200/f2.8 — 17 elements in 14 groups
Again, there are several illustrations within this patent. One is indeed for a 24x36 70-200mm f/2.8, another one is for a 1/1,7" 15-45mm f/2.8.
The Q's 06 Telephoto Zoom happens:
- to cover the 1/1,7" image circle
- to be a 15-45mm f/2.8
- to have the same optical formula as the lens described in the patent (same number of elements and groups and same diagram)
- to have been announced on September 10, 2012 when the above patent was requested on March 10, 2011 and granted on October 4, 2012.
Guess which lens this patent is for?