How good is the Pentax 50mm f1.2 A lens?

Started Nov 1, 2013 | Discussions thread
Peter Jonkman Regular Member • Posts: 116
Re: How good is the Pentax 50mm f1.2 A lens?

MightyMike wrote:

I've had and sold the K50mm F1.2 (should be the same formula) It was adequate for the little i used it. I also copied the optical formula for it from the patent to an optics program and sure enough even at F1.2 its quite good! I don't think it was ever specified in the marketing material but it has one aspheric surface.


As someone who's very interested in the history and design of Pentax lenses I think this post deserves a bit more exposure.

I'm VERY interested if you could point me to the lens patents because it's the very first time I hear about it having an aspherical element. That might explain why it's such a good lens (and I know that from experience; I will never part with the one I own).

Best regards,


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