MS-Optics ISM 1.0/50 GA

Review of using the ISM 50mm F1.0 from MS-Optics (Miyazaki Optics) with the Leica M digita

Table of Contents

ISM 50mm F1.0 Photo example (using Leica M-P)

I found it a little hard to avoid releasing the lens because of the severe flare at f/1.0, and when you stop down the aperture, the lens becomes useless as a large aperture lens.
Also, with a maximum aperture of f/1.0, it is difficult to focus with a rangefinder, and I recommend using a camera with an EVF.
I feel that the Sonnetar 50mm/F1.1 (Sonar type) is more straightforward and easy to use at maximum aperture. is straightforward and easy to use.

This is a large-aperture standard lens from MS-Optics (Miyazaki Optics), which uses a Gaussian lens format. In addition to the metallic green in the photo, there are also metallic brown(Gold), metallic red, metallic blue, black paint, black, and silver.

focal length(mm)51.5
Maximum aperture1.05
Minimum aperture16
Leaf blade16
Lens configuration5groups 7elementsGauss-type
Minimum distance(m)0.8
Lens length(mm)41Distance from mount flange to lens barrel tip (without hood)
Lens max diameter(mm)54.7The thickest part of the lens barrel
Filter diameter(mm)55Reverse mounting
ISM 50-GA Lens Configuration(Figure scanned and traced from the instruction manual that came with the lens)

Reference links

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MS-Optics ISM M50mm F1.0
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MS-Optics ISM M50mm F1.0


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