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Pentax 645Z Review

Medium-format cameras offer truly spectacular resolution, but until now, it's always come best camera alongside a difficult compromise. With the Pentax 645Z, that changes. Building on 2010's 645D, the Pentax 645Z offers features that are rare or in some cases unique in a medium-format camera. Pick up its weather-sealed body, and you'll find both live view and video capture on offer, not to mention an extremely wide sensitivity range, 27-point phase-detect autofocus system -- and compared to rivals, very swift performance too! And of course, you'll get the incredible detail-gathering capability of medium-format, plus a really big, bright viewfinder. Is it time you considered moving up from full-frame? Read on and find out!

Pros Phenomenal resolution and detail; Great high ISO performance; Rugged, weather-sealed body; Huge, bright viewfinder; Fast autofocus works well in low light; Swift performance for a medium-format camera; Good battery life; Shoots Full HD video

Cons Quite bulky compared to an APS-C or full-frame DSLR; Autofocus points clustered near center of frame; Most lenses aren't weather-sealed or optimized for digital; Prone to aliasing artifacts (but so are most high-end cameras these days); Attracts a lot of attention from passers-by

Price and availability Available since June 2014, the Pentax 645Z is priced at US$8,500 body-only.

Back in early 2010, Pentax launched the 645D, a medium-format digital SLR that it had been developing for the previous five years. It might have been a long time coming, but it was nonetheless exciting for it. The 645D leapfrogged rivals Canon, Nikon and Sony with two-thirds greater sensor area than a full-frame sensor, yielding a unique look and shallower depth of field. At the same time, it was vastly more affordable than offerings from medium-format makers like Hasselblad and Phase One, yet rugged enough to be used in the field.

Pentax 645Z Review -- Front view with lens The reason Pentax -- since taken over by Ricoh -- could offer its camera at a more attractive price-point than other medium-format products was pretty simple. Much of the design work for the 645D could be shared with the company's mass market, APS-C DSLRs, where Hasselblad and Phase One -- neither of which sells consumer SLRs -- had to bear the entire cost of development solely with their medium format products.

While Pentax lacked (and indeed, still lacks) a full-frame DSLR, the 645D served both as an aspirational model for the enthusiasts to look up to, and as something genuinely different to attract pros for whom that resolution and medium-format look was more important than high-speed capture. And boy, did it ever offer a lot of resolution by 2010 standards. (In fact, it's only recently that we've started to see cameras with smaller sensors catching up.) When we first put the 645D in our lab, we were amazed to find that it picked up details we'd never even noticed in our test scenes -- details that we couldn't even see with our own eyes, until we pulled out a magnifying glass to confirm them.

Pentax 645Z Review -- Weather seals Just like the medium-format film cameras in whose footsteps it followed, the 645D was never going to be a mass-market camera. Medium-format is an even smaller niche than it was in the film days, but the 645D was nonetheless a very important camera for the company, and its followup -- the Pentax 645Z -- is no less important.

Just like its predecessor, the Pentax 645Z shares much with Ricoh's flagship APS-C DSLRs -- and with four years of development having taken place on the APS-C front since the 645D was launched, there was no shortage of new features for it to inherit. But the most important feature of them all is at its very heart, a brand-new, Sony-sourced 51-megapixel CMOS image sensor. It's coupled to a PRIME III image processor, as first seen in the K-3, and the 645Z also inherits that camera's 27-point SAFOX 11 autofocus and 86,000 pixel RGB metering systems.

The 645Z's new image sensor allows a spectacularly wide sensitivity range, especially by medium-format camera standards, covering everything up to ISO 204,800 equivalent. It also provides both live view and Full HD movie capture capabilities, neither of which its predecessor was capable of. And performance has taken a big step forwards, at least compared to other medium-format cameras. This still isn't a sports shooter, but it'll shoot at almost triple the speed of the 645D. You'll also be able to review photos post-capture in less than half the time.