I shot a wedding with the K-5, the 15, 31, and 70mm Limited lenses, plus the 50-135 zoom. While the image quality was great, it missed focus a lot in backlit situations. Due to the size of the view finder, I was not able to accurately use manual focus. Also the TTL flash system left a lot to be desired in low light, although the IR sensor on the flash did help the AF a lot.
Because I shoot wide open a lot, and back lit a whole lot, these were pretty big issues. I switched to the D600, the Zeiss 50mm 1.4, and the Sigma 35mm 1.4. Couple that with the fact that the F100 is available for my film work, the current K5II model would still not be ideal, despite the AF imporvements.
Honestly I would shoot 99.9% of my digital professional work with the 31, 43, and 77mm lenses, if I could use them on a full frame body. Since the Limited primes are pretty much in line with the quality you get from Zeiss, the AF would be a welcome convenience, and I'd be able to see the focus more clearly in the shot. Actually if they had a good 'crop mode' I'd probably swap the 77 for the cheaper 70mm 2.4, and I'd love to keep using the 15mm f4 wide angle. The current Sigma and Tamron zooms for full frame would easily fill in for other users the gaps while Pentax designs a line up.
The K-5 design set up they have now is fantastic system, I just happen to be part of the small pro user group that needs what full frame actually gives you, better finder, better image dimensionality using wide open lenses for portraits (I don't really care about absolute resolution, and don't think it's critical to my work). I love Pentax, especially my 67II, but man, the only way I could switch back is if they make this flippin full frame camera! I feel like when using an optical finder camera a large sensor is a must. And i'm not a full frame snob, as I love APS-C cameras like the X100, the electronic finder option makes the smaller sensor a non issue. If I wasn't shooting the kind of work that I do, the K-5II would be more than enough, but seriously they need to make a full frame camera so I can switch back. If they do what they do now and buy the Sony 25mp sensor, I'll even still enjoy the great dynamic range that I'm getting now with whatever magic pixie dust Pentax applies to push it that much further.
Seriously I'd love to have one flash for a Pentax MZ-S, K-? full frame, 645N, and Pentax 67ii. Pentax, please, make this happen for me.
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