[Plastic] I promised myself that would not be a beta testor for Leica, remembering the development of the R4/R5. But like Rocket Raccoon, I really really wanted it so there went my resolve and I push the purchase button. So the next question is what what did I really want. The answer is a replacement for very old, but very well loved Telyt 560mm 6.8f. I have used this lens on a Visoflex II, III, an R5, R7 and finally a type 601. I was 35 when I bought it and am now 78. So auto focus, auto exposure and image stablization have all start sound pretty good, but the real issue is how fast you can grab image. The attached photo is the first I have taken with my new toy. I saw my cat, pointed and shoot faster than you can say point and shot the camera was set with the, stablizer on, program mode, 3x3 center focus matrix, center weighted exposure, ISO 800, hand held. The results 1/250 and f10. The focus peaking indicator show the camera focused on the cat's left ear. So my first impression is WOW, I am going to like using this thing. So my other first impressions... It is not very big, infact slight smaller and lighter than the 90-280. Which is the better lens, personally I don't care, so no comparisons here. They are really 2 different lens for 2 different jobs. Down sides, just one, who decided to put that unusual tripod bracket on the 90-280 and then copy it, they are not just the same part being recycled and mount it on the 100-400. The center of gravity for both lens coincides with the bracket. I now have 2 square Arca Swiss plates with a slot milled down the middle to match the edges of the dove tail on the lens. The result are lenses that balance in a gimbal mount -nice, infact very nice.

[Plastic] The lens is well known for exceptional sharpness and that really came home when I paired it with a M10 Monochrome. The tonal qualities rendered are extraordinary too.

[Zoom Gear] Before purchase, I rented the lens and paired it with my SL2S, then headed out to a birding site near me. Just as I left the parking lot, I saw a white egret in full flight about 75 yards away. Firing off a few images, I looked down at the screen and saw the incredible detail and dynamic range of my dreams. As I zoomed in, I saw that an excellent level of sharpness and detail were all there. 
It was a cloudy day, but with the SL2S's IBIS and 800 ISO, I was able to get lovely images at F 6.3. I went home two hours later and ordered the lens.

[Plastic] I'm using this extender with the Leica 100-400 zoom with great results. Really excellent sharpness and tonal quality, considerably better than I expected. I mean, this combo is sharp!

[Zoom Gear] I use the 21mm Elmar with my Leica SL2-S. I love the quality of the pictures, which are bright and crisp. Very good at all f stops. Manual focussing is a breeze and helps to fully compose a picture.

[Plastic] Purchased a Super Vario ELmar SL 16-35mm f/3.5-4.5 ASPH on secondary market without lens back or hood. Leica replacement part for lens completed set. As always, easy to navigate web site and secure item of choice

[Plastic] As you can imagine the image quality is superb and something you would expect from a company such as Leica.
I use it with my SL2 mainly to shoot the interiors of yachts and it’s plenty wide for it. Fast lens but if possible then I would want it to be even faster of course. Great for video also and provides a sharp image when accompanied with SL2. If you are looking for a wide angle lens for SL/SL2 then get this one and don’t cut yourself short with some after market lenses made for Leica, they’ll never be as sharp and good as the native lenses.

[Plastic] I had the pleasure of trying out this lens last weekend in Miami, courtesy of the Leica Store Miami. �Clear to the edges at all apertures, color rendition, etc., etc. �I couldn't find anything I didn't like with it.