It may not come as a surprise but the Nikon D810 has been a bit of a success for the camera manufacturer, both critically and amongst consumers. And when Pocket-lint recently documented professional photographer Tom Oldham's switch from Canon 5D MkIIs to D810s, he even said that although enthusiasts might baulk at the investment in such a top-spec DLSR, the technology is bound to bleed down into other points in the range.

He was right as well as Nikon has just announced the D750, a new full-frame DSLR - or FX sensor as Nikon likes to call it - that owes much to the tech created for the D810 but enters the market slotted between the D610 and D810 itself.

Fully featured but lightweight enough to throw in a bag, the Nikon D750 is designed for the keen amateur or professional who needs to travel light. It is 750g - an apt weight given its product name, but also lighter than the 880g of the D810 body - and is made of a monocoque structure consisting of carbon fibre thermoplastic for the front body and front cover, and magnesium alloy for the rear and top.

The sensor is among the biggest point of difference in the D750 though. Laden with 24.3-megapixels it's a lower resolution offering than the 36.3-megapixel D810. Just like its bigger brother it's possible to shoot in, 1.2x and 1.5x (DX) crop formats - with the latter effectively allowing you to fill the entire frame with visible autofocus points.

That's because the D750 features Nikon's latest 51-point autofocus sensor module, with 15 cross-type sensors (11 of which are f/8 compatible sensors) and the new group area AF mode. It's the same as found in the D810, and we already know just how top notch that was.

READ: Nikon D810 review

The sensor is paired with Nikon's latest EXPEED 4 image processing engine and can produce shots from ISO range 100 through to 12,800 (stretched to 50 to 51,200 if you want) and the camera is capable of shooting 6.5 frames per second in continuous shooting mode. That's the difference a lower resolution offers: that 6.5fps burst mode is faster than the D810's 5fps maximum, but also because the resolution isn't as huge it will likely be more useful for shooting moving subjects.

Battery life is super-strong too, indeed Nikon claims up to 4,400 shots before needing to recharge the included li-ion EN-EL15 unit. That's such a significant jump we could barely believe it - but queried Nikon at its presentation for confirmation.

Video is one of the D750's big focuses. Like the D810, it can record 1080p video at 60fps, but unlike any other full-frame camera from Nikon before, it also comes with a tilt-angle 3.2-inch 1,229k-dot LCD screen that can be manoeuvred 90-degrees to face up, or 75-degrees down to make capture that much easier. It also has a 170-degree viewing angle for those tricky moments - and from what we've seen it looks great.

As the screen takes up more space on the rear thanks to the tilt-angle mechanism, some of the camera's layout has changed. The "i" button, for example, no longer resides to the right, moving to the left row of buttons. It's a useful access point to jump in to important menu tasks quickly. 

Other buttons aren't quite as plentiful as the D810, though, with the quick-access ISO, white balance, metering and quality buttons absent from the single top dial. They're haven't vanished entirely though, with the usual rear left strip of four buttons joining the "i" for ease of use.

Other features include integrated Wi-Fi, meaning the D750 can connect directly to a smartphone and transfer pictures over for social network posting and so forth. Plus, there are two SD card slots rather than Compact Flash support - something that we're very much on board with. You can assign them to work in different ways just as with the rest of Nikon's two-slot pro DSLR range, such as sending raw files to one or JPEGs to the other. You can even use the second for overspill, to effectively double the storage space.

Of course, how well all this works in the field would require us to be out in the world. So far we've seen the D750 behind closed doors to gather an early appreciation of what it's all about. From our brief play with the camera in a London, prior to getting a fuller play at the unveil in Photokina next week, we're impressed by its weight, speed of use and how it fits into the full-frame market.

While mainly "thermoplastic" instead of purely magnesium alloy, the D750 still has a beefy, solid feel to it and operational tasks are quick to perform.

The Nikon D750 will be available from 23 September starting at £1,800 for the body only. It will also be bundled with Nikkor 24-85mm and 24-120mm lenses for £2,250 and £2,350 respectively.