I used to have a mint Pentax 7x50 BIF since sold on Ebay.
Pros: Well made and sharp
Cons: slightly narrower FOV than other similar designs, blue single coated elements, distinct green cast (was this deliberate to cut through marine haze or night use ?)
The more expensive and still in production (around £450 GBP in Japan) Nikon 7x50 IF SP, shown in section bellow, is a way better performer with field flattener doublet making the edges as sharp as the centre and modern coatings. Still no ED (extra low desperation glass) so there is some CA off axis)
Last edited by maico : Wednesday 15th November 2017 at 17:26.