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Panasonic and Olympus produce models using a Four Thirds size sensor. Panasonic’s cameras look more like traditional SLRs, with a viewfinder bulge on top, but are noticeably slimmer from front to back. Olympus’s PEN series are more compact-like and rely solely on the screen image for viewing, unless you splash out on a separate attachable viewfinder.

Sony’s NEX series cameras use APS-C size sensors – the same as the majority of DSLRs – but in a slim, compact-like body. The large sensor, as we know, has many advantages, but it does mean that lenses can’t be dramatically smaller than regular DSLR lenses. Viewing is screen-only.

All these cameras promise SLR-like quality and lens choice in a smaller, lighter package. This sounds like a good combination for the outdoor enthusiast, but it’s still early days for this whole class of camera. They definitely merit consideration, but they also demand a thorough, hands-on trial before you splash the cash. This is especially true of models with no viewfinder; even if you’re used to screen viewing on a compact, it’s a different ballgame with the larger, heavier lenses that these cameras use. Using one hand to support underneath the lens is essential, for a start. Also, their continuous Live View means that they will make heavier demands on batteries than a conventional SLR.