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New K100Y + 3 Lenses

Started May 15, 2020 | Discussions thread
Mistral75
Mistral75 Senior Member • Posts: 1,051
Re: Manual focus

bob5050 wrote:

Photodog2 wrote:

"special glass that 'excels in refraction'" [...]. What does this mean?

I thought that puzzler as well. I'd normally think of refraction characteristics as being important for lens glass, not the pentaprism.

bob5050

It doesn't relate to the pentaprism, it relates to the lens elements in the viewfinder, between the rear of the pentaprism and the photographer's eye.

Pentax KP cut in half

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