40mm f/2

Yes, also visible in prints.Actually completely uncorrected this lens is even wider with more distortion and vignetting and corner softness but that not obvious as the lens correction is already happening in the camera. In general it is true to some extend to all wide angle lenses much less now than decades ago. The only way to have edge performance identical to center performance are spherical sensors with lenses specifically designed for that sphere. (Sony developed something like that and maybe release it???). As the lens and sensor curvature are designed together it is not something easy to use in a camera with exchangeable lenses but it would be perfect for fixed lens cameras like the Q

I had the original Q and the 28mm focal length which is in reality a 26mm lens is the main reason I gave it up. 26mm is close to the standard angle of view to phone cameras. For some that may be great as it is what they are used to but a single focal length camera is for me to take more selective pictures than a phone. Optical the Q-lens is a great performer in the center but not so much in the corner and using a longer focal length could allow to design a smaller, lighter lens with better edge performance. A Leica Q with 40mm (+/-5mm) would be for me a definite buy. I find a tilting screen extremely useful for both shots low to the ground but also when using a tripod (Less hunching and also a little bit smaller tripod).

My first camera I bought was a Leica CL (the film one) and since then I had many more Leica cameras but not any more since I sold my Q. I am presently using a Hasselblad 907x50c and I am very happy with it both IQ and handling wise. I am interested in macro photography and for a long time I was using the R system with the Apo-macro Elmarit 100/2.8. I see no macro solution from Leica for the L-system but recently Panasonic came out with 100/2.8 which would be very interesting for a light weight macro setup. I have issue with most UI from other camera manufactures but Leica SL3 seems to be o.k.and it is also more portable than the previous versions. But the present lack of focus bracketing function (which works well on the 907X) in the SL3 makes that camera useless for my needs. Has anyone any idea whether Leica is interested in an firmware update which would allow that function or are they just ignoring macro?

As a very long time Leica user (my first camera I bought was a Leica CL and this was not the recently abandoned one) I migrated to Hasselblad. As I used many different camera systems I appreciate HB's UI but second comes Leica and I would be interested I a second camera but it needs good macro capabilities. At least now there are 2 macro lenses for the L-system: the Sigma 105 and the just announced Panasonic 100mm/2.8 which is an amazingly small and light macro lens in that focal range. One main issue for me getting a Leica SL is the lack of built in focus bracketing (only Panasonic S has it within the L-system). So I am hoping that will be implemented in the SL3 but I am pessimistic. I still think back to the Apo Elmarit 100mm/2.8 macro, their best lens I had after the original Summilux M 75mm. I don't understand why Leica is now completely ignoring any more specialized photography (that is including tele which was one of their obsessions decades ago).

From all the Leicas I had I only kept the Q but when the Q2 came out I decided to get a Hasselblad 907X with the 45P lens. My first Leica was the CL (original = film!) and I got imprinted on 40mm/90mm. 28mm lens is now just like standard cell phone camera view so my Q gets largely neglected. I would be interested in a Q3 only if it would give me focal length of more than 35mm, idealy 75 mm (the 75/1.4 was my favorite lens for my Ms) with a decent close focus range.

quite amazing macro! Only way to improve sharpness would be focus stacking which is impossible with moving objects.

I am extremely disappointed with Leica. I upgraded to that firmware just before I left to a hiking trip to the Olympic Peninsula and I had to remove the battery twice just to make it work again and I lost in the process a couple of good pictures. Also all my settings got lost, another point of frustration. All the previous firmware updates worked smoothly but that one is a nightmare for me.

I had a conversation at a Leica store and they told me to expect a new Q for Photokina this year. Likely not something like 35mm or 50mm as it would compete too much with the M. I said I would be interested in something with better macro capability and they thought that may happen.

I just sold all my M but I am still find the Q the best camera I own except it is not 40mm

I was today in a camera store (to get a non functioning Olympus lens exchanged) and I discovered that they have both the SL and X1D on display. I only looked at the X1D after seeing the native lenses of the SL. Great camera with some idiosyncratic issues like how long it takes after you pressed the release to see the EVF be back in action. Still I am interested if their macro 120mm is on the affordable range! I wished that the SL would not be the exact opposite of the M range in dimensions.

I got a Leica Q around a year ago and shortly afterwards I noticed sensor degradation on my M9 again. I was sending it in a second time and had to use the Q for most of early spring and summer. I really like the Q, easy to focus (auto or manual) and I really appreciate the precise framing which is more an estimate with the M. When I got the M9 back I made a few pictures to see is it works but since then I never used it again. So I think I should get out of the M-system completely in spite of the M10 which I think is the best designed M. So I am contemplating what will replace the M9. May be RF should be considered in the same way as SLR a technology remnant of film days. Presently mirrorless cameras make more sense for me. The SL is too bulky for me and lacks lenses I am interested in. The Hasselblad X1D looks like a good design but I am not sure that it is prudent to invest is such system presently with uncertainty about the company and not even a clear statement to which lenses will be developed (similar to the SL). I am very interested to get back to macro (I used a R6 and 100mm Elmarit for a long time) and I think that nowadays focus stacking is an essential feature of macro photography. I tried it with a M9 visioflex setup and Sigma Merrill DP3 and is was a painful process. The higher end Olympus (and Panasonic) cameras have builtin focus bracketing and automatic focus stacking (limited to 8 exposures )but either way this process is very fast (< 1 sec). None of any other system has these options. So I guess I will get one of these MFT cameras even I would like the better DR of larger sensors. In principal I like to change cameras (if they are not too bulky to carry) them instead of changing lenses (and cleaning sensors)

Here is the official link: http://uk.leica-camera.com/Photography/Leica-M/M-Lenses/Summaron-M-28-mm-f-5.6 looking at the linked technical specs. This lens has quite good resolution in center and middle but terrible in the edges (past 15mm). No distortion! Good for APS-C but not for FF for anyone who likes not only the center well resolved.

It is not so small with the hood is attached - so not much difference with hood to the Elmarit with hood (which was the smallest recent Leica lens). So I am not quite getting the purpose of this lens.

As far as I understand that 60mm T has internal focusing and therefore extension tubes will severely degrade IQ (like the Macro-Elmarit R 100/2.8)

I am looking for a good macro lens system in APS-C (or MFT) and I would consider the next T(L) if it has a builtin EVF. But I find 60mm for a APS-C macro on the short side. I think the best focal length (FF equivalent) is 120mm to 135mm giving enough distance to not scare/shade the object but not too long (with a higher probability to have something obscuring in the optical pathway). I used my Macro-Elmar 90mm with a Nex7 and that was pretty optimal focal length wise but that lens is only an excellent performer up to 1:3. Fuji has a 80mm macro planned for next year.