90mm——Favored Focal Length for Portraiture 4 Sets of Achromatic Doublets Dispersion is a common optical phenomenon, especially in fast lenses. 4 sets of Achromatic Doublets are used in M 90mm f1.25 lens to significantly improves the chromatic aberration and the resolution performance, presenting excellent image quality.The spherical aberration of achromatic doublets is better than singlets. First Choice for Portrait and Close-up Beauty Its high speed and the unique aesthetics of its depth of focus make this telephoto lens the first choice for portrait photographers. The angle of view is 27 degrees. It highlights the main body while avoiding the suffocating sense of space compression caused by super telephoto lens. Smooth Bokeh with Fast F/1.25 Maximum Aperture Extremely fast f/1.25 maximum aperture affords notable control over depth of field for selective focus shooting, and also benefits handheld shooting in difficult lighting conditions.The smooth transition between the focus object and the bokeh creates a dreamy picture with an ideal depth of field and fascinating background blur. Lens Hood Reverse Attaching Handy reversible design allows you to attach the lens hood in reverse for easy storage. With the extended lens end, it can protect the lens from moisture, wind-blown debris and impact. Bring with Tripod Mounting Hole Due to the size and weight, the 90mm F1.25 manual focus lens fits on a tripod for a more stable shot, so there is a tripod mounting hole at the bottom of the lens. A Clicked Aperture Ring The aperture ring is stepped with the right amount of resistance and click, marking on full stops from f/1.25 to f/16. Support Macular Linkage Support the macular focusing of Leica/Voigtlander/Minolta and other paraxial m-port cameras.
D**I
Don't Do It.
The RF focus mechanism is utter horrific, to put it mildly; you simply cannot rely on the RF for focusing as it will be off by a LOT depending on the subject distance and/or aperture. It has the tool to "adjust focus" but you will come to realize that this adjustment is due to the deficiency of the lens not being able to reliably focus beyond a certain limited range--i.e., you will have to adjust focus mechanism depending on what subject distance and aperture combination you need it to be sharp...there is no global adjustment that would make the RF focus mechanism behave the way it is expected to be. For a camera that has live focus mechanism this is not relevant...but the problems do not end there.The lens is simply not sharp. it's not sharp at 1.25, it's not sharp at 2.0 it's not sharp even at f8.0. There is always CA at any aperture, and this makes this lens largely unusable in most use cases other than maybe portraits where you don't want to image too clinical...but here's the thing, you can make a lens less sharp on post-processing, but you cannot make it sharper.So don't do it. I know the price makes it tempting, but it's not worth it.
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