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05-01-2009, 06:19 PM   #1
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Pentax-FA vs Pentax-F 1.7/50mm

Hello, Anyone who knows the difference between Pentax-FA 1.7/50mm and Pentax-F 1.7/50mm lenses? Both are AF lenses, both have the same shape, and both have 5 contact point at the end. F lens has the big 50mm in red on the barrel, while FA doesn't. Any other difference? in design, in value? in picture quality? Thanks.

05-01-2009, 06:26 PM   #2
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optically they are identical, and that's all that matters. Pentax f/1.7 lenses have a good reputation for being decent performers. I use an A- series 50mm f/1.7 when using my 50mm f/1.2 really isn't necessary.
05-01-2009, 06:27 PM   #3
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The Pentax-F version is a generation older than the Pentax-FA version. That's probably the most significant difference.

Regards,
Mike
QuoteOriginally posted by d-gear Quote
Hello, Anyone who knows the difference between Pentax-FA 1.7/50mm and Pentax-F 1.7/50mm lenses? Both are AF lenses, both have the same shape, and both have 5 contact point at the end. F lens has the big 50mm in red on the barrel, while FA doesn't. Any other difference? in design, in value? in picture quality? Thanks.
05-02-2009, 02:11 AM   #4
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The FA has a chip in it that stores more data than the F. The only documented data that is used is for the MTF program on the higher end cameras. (Zooms report their focal length more accurately too.) The FA focus ring is wider and focus might be a bit more refined; some F lenses are very noisy. The FA is not as common.

05-02-2009, 02:36 AM   #5
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QuoteOriginally posted by Just1MoreDave Quote
The FA has a chip in it that stores more data than the F. The only documented data that is used is for the MTF program on the higher end cameras. (Zooms report their focal length more accurately too.) The FA focus ring is wider and focus might be a bit more refined; some F lenses are very noisy. The FA is not as common.
I think that't all correct, and combined with previous post saying "they are opticaly the same" that's all there is other then aesthetics...

I have 50/1.7 and it's a great lens, if you can get your hands on either F/FA don't hesitate...

BR
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