Based on threads from various internet user forums, I propose to start this off with a summary of questions that interested people are trading, that seem to yet to have no clear answers. If anyone else actually reads this, please feel free to suggest additional or modified points to this list. Why? Any commentary from the L-Mount partner companies would be very welcome and encouraged, even with all kinds of commitment-free disclaimers. This forum will gain a lot more attention if there is even a small indication that the manufacturers are actually engaged here! But even if no direct or immediate answers are forthcoming, it should be useful for them to know what people are asking. Since this is a very early post in this new forum, I have no idea how much traction this will get. But it seems like this could be the right place to have visibility to the L-mount partner manufactuters. What L-mount is all about Is it intended to ensure full interoperability,or simply a a common mount with potentially varying operational systems of autofocus, stabilization, image pipeline etc.? Is there an intent to foster, or at least not impede a high degree of adaptability to non-partner, non L-mount lenses? Is the system intended to foster compatibility of accessories, batteries, flashes, connectors etc., or is it centered primarily on the lens mount alone? Lens and body compatibility issues within the L-mount system: Assuming that there must be an internally-published L-mount specification for the partners, what aspects of the system are covered, are mandatory, and what are optional or flexible? Mount tolerances - e.g. flange-distance, alignment, materials, strength specs (the first especially affects accuracy of lens infinity position and focus scale accuracy if provided) Body support of various image formats and sizes, e.g. APS crop from FF, multi-aspect options and ability to create non-Leica-format (non-24x36) but "FF-sized" images. Optical standards - sensor incidence & acceptance angles, spectral response of lens vs. sensor-stack, image-circle margin, minimum imaging quality standards if any Unified support or allowance for image corrections (distortion, CA etc.) or any mandate prohibiting them? There is a lot of concern about auto-focus systems especially contrast-detection (CDAF) as it evolves: Is there any mandate or standard for the AF system, AF method or enhancements, any unified support, for AF L-mount lenses? Is there any possibility for a partner to introduce Phase-detection (PDAF) as a basis or enhancement of AF within L-mount? Specifically, Panasonic is already referencing ongoing developments of DFD. Is it an L-mount Alliance issue, or completely a Panasonic decision as to whether those enhancements might be supported by other bodies or other lenses? Similarly for stabilization, regarding in-body (IBIS), lens optical (OIS) and combined (Dual IS): Is there any position of the L-mount Alliance regarding interoperability of stabilization, particularly the user's ability to choose between IBIS and OIS if both are available, and support of Dual IS (by whatever trade-name) between different-manufacturer lenses and bodies? Lens compatibilities outside L-mount This is a very broad topic that cannot possibly be addressed in all aspects, but Is it physically possible for standard L-mount to support Micro Four Thirds lenses via adapters, and if so is there any plan to make this available? If not, is it contemplated that some variant or feature of an L-mount camera could be provided to enable MFT compatibility? Is it the intent of the L-mount Alliance to enable adaptation of other-manufacturer APS or FF lenses? Will AF and/or AE-compatible adapters be provided by partners for any non-partner lens mount? Will other (current non-partners) be able to obtain a license to manufacture high-compatibility adapters for outside lens mounts? Future L-mount products - without demanding obviously secret plans, the following questions are on users' minds and would at serve as input to the L-mount manufacturers. Any hints would be like gold. Is there any near-term concept of a corner-EVF version of a Full-Frame L-mount camera, as in an FF Panasonic "GX" style or an FF Leica "CL" style? Can users expect to see new Sigma lenses computed specifically for L-mount short-flange optimization, in addition to "mount-converted" existing lenses? Can users expect to see a good range of more compact and lighter, even if slower, native L-mount lenses in the near future?