Fundamentally, we recommend San Disk cards as we prefer to use these for compatibility tests at Leica. To ensure optimum exploitation of the camera’s performance potentials, we recommend the use of Class 10 cards with speeds of ≥30 MB/s – e.g. from the SanDisk Ultra or SanDisk Extreme lines. SDXC cards with higher speeds are compatible, but offer no additional benefit in terms of speed compared with SDHC cards.
In-house testing according to CIPA standards shows that a full charge is sufficient for around 800 images in classical rangefinder mode and around 400 in Live View mode. How users handle the camera can lead to significantly more or significantly fewer exposures from a full charge. Using the video function, the electronic viewfinder, or the GPS function also increases power consumption.
The ISO sensitivity values in digital cameras are increased by applying signal gain. This process amplifies not only the signal, but also the residual noise component of every image. This means that at ISO settings greater than 3200, it is not necessarily certain that the images captured will be free of interference like extreme noise, banding, or individual pixel errors. We therefore recommend the use of the ISO push settings only in exceptional cases. Take care to expose generously, particularly when shooting subjects with dark, homogeneous areas.
All image sensors for Leica M cameras are designed and constructed to provide the best possible image quality with Leica M lenses. One prerequisite for this is the use of an extremely thin infrared filter on the image sensor to ensure a full corner-to-corner rendition of details. The consequence of this thin filter is that infrared light is not completely absorbed. This may result in slight color variations in certain lighting situations. This can be particularly critical when photographing dark-colored textiles in incandescent light. The infrared sensitivity of the M8 is so high that we strongly recommend the use of a UV/IR filter. The infrared sensitivity of the M9 and M (Typ 240) cameras is approximately 5% of that of the M8; these cameras can therefore be used without an IR cut filter. Nevertheless, when shooting critical subjects, it cannot be completely ruled out that corrections in post processing may be necessary.
As no lens movements can be detected, automatic activation of the focusing aids is not available when using the adapter. When using the adapter, the camera cannot detect whether the lens mounted on the adapter has been changed. Manual selection is therefore necessary every time the lens is changed. As the rangefinder is not activated by the lens/adapter combination, rangefinder focusing is not possible with R-Lenses.
The new M camera is sealed as effectively as possible by internal seals to reduce the chance of water penetrating the camera body to an absolute minimum. This means, for instance, that penetration of water into the camera is not to be expected when using it in a light rain. Nevertheless, please note that the system does not feature a bayonet seal, and that Leica M-Lenses are not protected against water spray or splashes.