It may push the definition of ‘compact’ to its limit, but Leica’s top-end CSC has some outstanding features that set it apart from the rest, as Andy Westlake discovers
Leica SL (Typ 601) review – Features
Usually the first thing we examine with any camera is the sensor, and Leica has opted for a 24-million-pixel full-frame CMOS unit. This does without an optical low-pass filter to maximise acuity, but clearly the SL is still some way behind the latest high-resolution models such as the 50.6MP Canon EOS 5DS R, 42.4MP Sony Alpha 7R II or 36MP Nikon D810. However, Leica is keen to stress that pixel count isn’t the be-all and end-all of image quality, and that the excellence of its lenses should at least partially close the gap. It’s also probably worth pointing out that 24MP is easily sufficient to give highly detailed 24x16in/A2 prints, although higher pixel counts do offer more scope for cropping.
Paired with Leica’s Maestro II image processor, the sensor delivers a standard sensitivity range of ISO 50-50,000. Raw files are recorded as 14-bit DNGs for maximal tonal gradation and easy processing. Continuous shooting is available at a hugely impressive 11 frames per second, with focus and exposure fixed at the start of the burst, dropping to 7fps with live view, autofocus and autoexposure adjustment between frames. Buffering is very respectable, with up to 30 raw frames or 70 JPEGs recordable before the camera starts to slow down.
The sensor sits behind the L-mount, which is physically the same as that used in the Leica T. It’s an all-electronic, four-pronged bayonet, which Leica says was designed with full frame in mind from the start. It’s noticeably larger in diameter than the Sony E-mount used by the Alpha 7 series, giving more space around the full-frame sensor, especially at its corners.
Timed shutter speeds range from 60secs-1/8000sec, with up to 30 minutes available in bulb mode, and a very respectable flash sync of 1/250sec. The shutter is pretty quiet, and the combination of 1/8000sec shutter and ISO 50 allows for shooting at large apertures in bright light. Dual SD card slots are used for storage, and the camera can either record files in duplicate to both cards simultaneously, or switch to using the second when the first is full. Unusually, one slot accepts UHS-II cards, which have a second set of pins for dramatically faster write speeds. This is worth knowing as it can take nearly 90secs to write a full burst of raw files to a conventional SDHC card.
Leica has included an intelligent Auto ISO function that allows you either to set a fixed minimum shutter speed, or specify that this should adjust to match the focal length of the lens in use. Auto ISO can also be used in manual-exposure mode, allowing you to choose the shutter speed and aperture to suit the subject and let the camera adjust the ISO to compensate for changing light; this can be combined with exposure compensation to adjust the image brightness. One neat touch is Floating ISO, where the camera will adjust the ISO purely to compensate for any change in maximum aperture on zooming the lens when shooting wide open.
Aside from the basics, though, the SL has few additional options. There are programmable intervalometer and autobracketing modes, with the latter including the ability to make a high dynamic range JPEG file in-camera. But there’s no space for such fripperies as art filters, panoramic shooting or a multiple-exposure mode. With this in mind, it may come as a surprise to find both Wi-Fi and GPS built in, but Leica considers both to be genuinely useful tools for serious photographers – and I agree.
Where the SL gets particularly interesting, though, is with regards to video recording; it can record 4K video at 30fps using a Super-35 crop of the sensor. As this is a similar area to APS-C, it will work with lenses designed for the Leica T, allowing true wideangle shooting. The camera allows 4K footage to be recorded internally to SD cards in 4:2:0 8-bit mode, or to an external recorder over HDMI in 4:2:2 10-bit mode. Alternatively, full HD video can be recorded at up to 120fps. A dedicated live view mode shows a 16:9 cropped view, with optional focus peaking and zebra-pattern overexposure-warning displays. Slightly disappointingly, though, microphone or headphone sockets can only be added via an adapter that plugs into the camera’s proprietary multi-connector socket.