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Finally bought a K5 and joined 2011, already in progress...

Started Apr 15, 2013 | Discussions thread
Joseph Tainter Forum Pro • Posts: 11,494
Re: Congratulations

soheil wrote:

Joseph Tainter wrote:

soheil wrote:

Welcome to K5 series. I may suggest while those FA*s are excellent lenses, any high res FFs may need more modern FF lenses like DFA* which is optimized for digital FFs.

Best regards,

Soheil

The DFA lenses have optical formulae very similar to the FA versions.

Joe

Hi Joe,

I think high grade lenses for High MP digital FFs need some optimizations like different coating or more ED elements or so and if you want to use the full potential of these new cams you must used better lenses.

Yes, Pentax applied new, digital coatings to the DFA lenses. They also made one optical change to the DFA 50 because of a ghosting problem. Otherwise the optical formulae are very similar to the FA lenses.

Somewhere in the dpreview archives there are posts showing the optical formulae. I don't know where they are, but they were posted sometime soon after the DFA lenses came out. That was in 2004.

I still use my FA 100 F2.8 Macro and FA* 200 F4 Macro, with excellent results on my K5.

Joe

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