M S Optics ISM 50mm 1.0

[inglis]

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The MS Optics 50mm 1.1 Sonnetar is very fast, noted on the description sheet as being f1.16.

Now the MS Optics ISM 50mm 1.0 is available in M mount at only 178 grams.

It is noted as f1.05 on the description. So it is only somewhat faster than the Sonnetar. 

If one already has a Sonnetar 50mm, not sure if they would be interested in this lens.

With Gauss type lens it does not have the soonar qualities of the former, but apparently also not the tricky coma adjustment ring.

16 rounded aperture blades.

Looks interesting though for digital or film,
https://www.japancamerahunter.com/20...f-1-0-m-mount/

 

[mmradman]

I think the lens weight is stated as 0.45 kg or one pound.  Probably comparable to other fast 50mm lenses.

https://www.japancamerahunter.com/product/ms-optics-ism-50mm-f-1-0-m-mount/

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[lct]

Description says « To make a large aperture lens requires thick, heavy high refractive index glass, but I deliberately used thin and light high power optical glass, and reduced the size of the rear group to meet the size requirements, thus successfully designing an ultra small and light full frame Leica M lens with a length of 40mm, diameter of 50mm, and weight of 178g ». Wrong translation you think?

[Ecar]

CA looks VERY nasty - and not just wide open.

[g2van]

Yeah, looks way too glowy and over-coma-tose for me at f1.

[Ecar]

This one actually seems more interesting:

https://www.japancamerahunter.com/2019/05/camera-geekery-ms-optics-vario-plasma-1-5-50-m-mount/

[Twasi]

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I have the 50mm Vario-Prasma and it's a very interesting lens, but mostly useful when you want spherical aberration at the edges. It's an "Edward Steichen" lens, useful for compositions where the emphasis is on the center, not for multi-centered subject matter.  In addition to diaphragm and focus, it has a setting for spherical aberration. That is, the floating lens group is adjustable.  Also it does not synch with the rangefinder except with the spherical aberration set to the minimum. 

Edited November 1, 2019 by Twasi

[james.liam]

17 hours ago, Twasi said:

I have the 50mm Vario-Prasma and it's a very interesting lens, but mostly useful when you want spherical aberration at the edges. It's an "Edward Steichen" lens, useful for compositions where the emphasis is on the center, not for multi-centered subject matter.  In addition to diaphragm and focus, it has a setting for spherical aberration. That is, the floating lens group is adjustable.  Also it does not synch with the rangefinder except with the spherical aberration set to the minimum. 

Sounds crazy, niche, complicated, impractical and of limited usefulness, i.e., standard Miyazaki creation

Edited November 2, 2019 by james.liam

[pico]

35 minutes ago, james.liam said:

Sounds crazy, niche, complicated, impractical and of limited usefulness, i.e., standard Miyazaki creation

IOW, the other perfect Leica lens.