The Leica SL2-S is a Mirrorless Camera with a digital viewfinder. It also could be set to shoot color or B&W images. The Leica M10 Monochrom is a Rangefinder Camera with a optical viewfinder. This camera could only shoot B&H images.

Yes it does but its not a deal breaker IMHO. I always shoot my M10 mono with 1/3 to 1 stop negative exposure compensation depending on how dynamic the scene is and how the camera meters it. If you underexpose your shadows using this method in post you can bring back a lot of shadows very easily. And with low noise to boot. Just remember unlike the M11 which has matrix sensor based metering the m10 mono is more center weighted. That is important to know when taking a reading. Of course there is always live view to really see how the highlights will behave. Enjoy.

If you mean which lenses does the bright-line frame lights up with then the following will apply. The relevant bright-line frame will light up in the combinations 35 mm + 135 mm, 50 mm + 75 mm or 28 mm + 90 mm when lenses with a focal length of 28 (Elmarit as of serial number 2 411 001), 35, 50, 75, 90 and 135 mm are used. Some other useful info is as follows. The bright-line rangefinder of this camera is not just a very high-quality, large, brilliant and bright viewfinder – it also doubles as a highly precise, lens-coupled rangefinder. All Leica M lenses with focal lengths between 16 and 135 mm are coupled automatically when they are attached to a camera. The viewfinder has a magnification factor of 0.73x. The bright-line frame is coupled with the focusing function in such a way that the parallax – the offset between the lens axis and the viewfinder axis – is compensated automatically. At ranges under 2m, the sensor captures slightly less than indicated by the inner edges of the bright-line frame, and slightly more at longer ranges. These slight, almost negligible deviations are systemic. The bright-line frame of a camera with viewfinder must be adapted to the view angle of the relevant focal length of the lens. The nominal view angle changes slightly when focusing due to the changing draw-out, i.e. the distance of the lens system to the sensor level. When the set distance is below infinity (and the draw-out accordingly greater), the actual view angle also decreases – the lens captures less of the image object. The view angle differences at greater focal lengths tend to be larger due to the greater draw-out.

It is in fact, the same sensor as the M10-R but without the bayer filter. The Leica Q2 and Leica monochrome cameras are so radically different that I have no idea what limitations they might share in post processing.

I contacted Leica concerning your inquiry. According to the manufacturer, the Leica M10 Monochrom Rangefinder Camera does not internally have the second row of pins to fully utilize the faster throughput of UHS-II SDXC memory cards. While UHS-II cards may be used in the camera, Leica instead strongly recommends to use a UHS-I memory card for best performance as you will actually get faster transfer speeds using a UHS-I card in the Leica M10 Monochrom Rangefinder Camera than when using a UHS-II memory card.

In Bulb mode its 16 minutes.

The following is an excerpt from the instruction book of the new M10 Monochrom. It does not "self clean" but can detect if the sensor needs cleaning by following these steps. The second part discusses the options for cleaning the sensor. SENSOR DUST DETECTION Any dust or dirt particles stuck to the glass cover of the sensor may result in noticeable dark stains or specks on the pictures. Use the Dust Detection function to check if and how much dust is on the sensor. This procedure is more accurate than a visual check and therefore a reliable method to find out if cleaning is needed. ▸ Select Sensor Cleaning in the main menu. ▸ Select Dust Detection • The following message appears: Please close the aperture to the largest value (16 or 22), and take a picture of a homogeneous surface (defocussed). ▸ Shutter release • A “picture” will appear on the display, in which black pixels represent dust particles. Note • A relevant message will be displayed if dust detection is not available. The display will return to the previous screen after a few seconds. Repeat the process as needed. SENSOR CLEANING You can send your camera to the Leica Customer Care department for sensor cleaning (see p. 138). This service is not part of the warranty offering and will therefore incur charges. Use the Open Shutter menu function if you feel confident that you can do the cleaning yourself. The function will keep the shutter open and allow access to the sensor. Use clean, possibly ionized gases like air or nitrogen to blow loose dust from the cover glass of the sensor. We recommend using (rubber) bellows without a brush. Some specialist, low-pressure cleaning sprays, e.g. "Tetenal Antidust Professional" can also be used (follow the instructions provided for the product). Please contact Leica Customer Care if you are unable to remove the particles with the methods described above. Note • Leica Camera AG will not accept any responsibility for damages caused by the user when cleaning the sensor.

The Leica Summicron 50 f/2 with close-up function is not compatible and should not be mounted on the M10 Monochrom (or any M10, M11 models). This older lens is one of less than a handful of M lenses produced since 1954 that are not compatible with current M digital cameras.