[Front] Stuff I like: Great sharpness, contrast, color for landscape, ditto for close-up, great small size/weight and great click-on lens hood (ALL OF LEICA'S LENS HOODS SHOULD BE DESIGNED EXACTLY LIKE THE 90MM MACRO ELMAR'S). Not so good: I get that this is a rangefinder lens, but it has a poor native macro focusing ratio of 1:6:7, which only improves to 1:2 with the Leica Macro-Adapter-M. (I bought the somewhat-more-versatile Novoflex Adapter Kit for Leica M-Mount, Visoflex Lens to Leica M-Mount Camera, but I'm still not near 1:1.) Conclusion: I primarily bought the lens for landscape, and it's a swell, compact lens for landscape and casual close focus, but is not for hardcore macro shooters imaging stamps and coins and other tiny stuff.

[0.1 lb] Sharp. Tiny. Macro is a bonus. Pleasure to walk around being able to take 90mm filed-of-view photos with such a small package on an M11. Collapsible mechanism feels as solid as you'd expect from Leica.

[Front] This is a very good , albeit expensive, lens. Am glad it came with a shade. I'm using it for close up photos of machine parts

[39 mm] Absurdly expensive for a lens cap, but fits perfectly on the old Leica 50mm Summicron DR I have. It looks good, too. What else would you expect?

[Slip-On] Although too slow for hand held shots in real dim light, with my M9 either in my studio or outside even on cloudy days it's performance is excellent corner to corner. My 90 Apo might have a slight edge at f4.0 over the Macro wide open but only off a tripod. I can't see any difference at F8.0 in performance. For my last trip to Alaska and Germany and France, I took the Macro leaving the 90 Apo behind because of the size and weight and was not the least bit disappointed. Shooting in DNG, converting to Tiff with minimal tweaks, this lens goes to needle sharp 17 x 22 inch Epson print images with ease right to the corners.

[Front] best quality as leica made

[Slip-On] Sharp lens. Small and light weight. It's an excellent travel companion. For the most part, the lens shade is not necessary. At f/4, there is just enough blur to the background to create separation in my subject shots, but the background still contain enough information to show time and place.

[Front] It’s a $100 metal lens cap. What else do you put on a $12,000 lens?
I suppose you don’t go with Leica if you don’t want to pay the price. It looks good, offers great protection, and covers the lens with the hood extended.

But darn...$100

[0.1 lb] If you do not need large apertures, this Leica Macro-Elmarit 90/4 ASPH is a great lens for the Leica M. I use it like a non-macro lens.

[0.1 lb] This works great on my 50 2.8, 35 f2, and 90 f4 macro Elmar