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Old Wednesday 15th November 2017, 18:27   #24
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Join Date: Jul 2005
Location: Twin Falls, Idaho
Posts: 2,031
Originally Posted by maico View Post
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)

A Prostar without the stripe on the objective beauty ring or cost?

“There are children playing in the streets who could solve some of my top problems in physics because they have modes of sensory perception that I lost long ago.”— J. Robert Oppenheimer
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