Pentax aims for the big time with its radical new full frame DSLR

Pentax K-1

Pentax has made no secret of its full frame DSLR plans, announcing the development of its new high-end camera last year. But it's done a good job of keeping the specs secret, so although a few stories began to leak out in the days leading up to the launch, the full details have stayed a mystery.

Which makes the official announcement all the more dramatic – not just in the headline specs, but in the details of what promises to be an extremely interesting and innovative camera.

First, the price, because this puts everything else in context. The Pentax K-1 will go on sale mid-April 2016 at £1599.99 body only in the UK (about US$2,280/AU$3,200). This puts it straight up against budget full frame DSLRs from Canon and Nikon, yet the K-1's specs put it in a higher league than these cameras.

It comes equipped with a 36.4MP sensor with 50% more resolution than the Nikon D610 and D750 and all Canon DSLRs bar the mighty EOS 5DS. This is hooked up to a new PRIME IV processing engine to deliver 14-bit image data a maximum ISO of 204,800.

Pentax K-1

The K-1 comes with a 36-megapixel full-frame sensor and a scaled-up version of Pentax's clever sensor-shift shake reduction system.

The autofocus system is based around a new SAFOX 12 33-point AF system, with 25 cross-type sensors and sensitivity down to -3EV. This works alongside an 86,000-pixel RGB metering sensor.

Like the Nikon D810, the K-1 drops the anti-aliasing filter in front of the sensor in favour of maximum detail rendition – though it can also counter the possible moiré side effects with an optional aliasing simulation mode that uses tiny vibrations of the sensor to achieve the same effect as an anti-aliasing filter.

No shaking, rattling or rolling

This is made possible by Pentax's clever sensor shift system. The company has successfully scaled up the in-body shake reduction system of its APS-C DSLRs to work with the K-1's much larger full frame sensor. It's a powerful 5-axis stabilisation system that can counteract pitch, yaw, horizontal, vertical and roll movements and offers up to a 5 stop shutter speed advantage.

Pentax K-1

Pentax K-1

The sensor-based SR system offers 5-axis image stabilization and a whole raft of additional features including anti-aliasing simulation, an Astrotracer mode for astronomers and a high-quality Pixel Shift Resolution mode.

Pentax doesn't just use this system to counteract camera shake. It's also used for the K-1's Pixel Shift Resolution mode, a feature first seen on the APS-C format Pentax K-3 II. In this mode, the camera takes four shots in quick succession, shifting the sensor by one pixel each time, so that the camera captures full colour information for each pixel – other cameras have to interpolate this color data from surrounding pixels.

This produces images with much better color information with sharper detail and fewer artefacts. It's designed for tripod use, but it's been developed in the K-1 to allow for moving subjects. The new system can detect areas in the frame where there's movement and use just one of the four frames in those areas to avoid any motion blur.

The sensor shift mechanism is also used for the K-1's Astrotracer feature. The camera has a GPS sensor built in, and it uses this data, in conjunction with the sensor shift mechanism, to adjust to the movement of the stars without the need for a motorised astronomical telescope mount. Pentax told us this allows exposures of up to 25 minutes with stars stationary in the frame rather than recording as streaks of light.

It's also possible to make fine adjustments to composition with the camera on a tripod in live view mode, again using the sensor shift mechanism. This might not be useful in everyday photography but could prove a real benefit for painstaking macro or copying work.

Pentax K-1

Pentax K-1

Pentax K-1

The Pentax K-1 has an articulating screen with a difference! It can tilt up and down, left and right and even twist in a rotational movement.

The K-1 also has an articulating screen – with a difference. This one pulls out from the body and can be angled both left and right as well as up and down. It's also tough – there was a collective gasp from the audience as Pentax held the K-1 by its screen alone and gave it a gentle shake. And that was with a hefty 28-70mm f/2.8 lens and battery grip fitted.

Rod Lawton is Head of Testing for Future Publishing’s photography magazines, including Digital Camera, N-Photo, PhotoPlus, Professional Photography, Photography Week and Practical Photoshop.