A rare early Tokyo Optical fast normal lens in coupled Leica screw mount, combining a seven-element layout with a substantial chrome barrel.

Tokyo Kogaku Simlar 50mm f/1.5

LTM mount

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The Tokyo Kogaku Simlar 50mm f/1.5 is a LTM-mount lens for Leica rangefinder cameras. Leica price index →

Reference maintained by Thomas Boots

How it compares

Measured against the 106 other 50mm LTM-mount lenses in the catalogue.

f/1.5 Maximum aperture Faster than 79% of them

Specification

Focal Length: 50mm

Aperture: 𝑓/1.5

Release Year (from): 1950

Minimum Focus Distance: 1.07m

Elements in Groups: 7/4

Mount: LTM

Colors: Chrome

About this lens

Tokyo Kogaku Simlar 50mm f/1.5

Optical Qualities

The Simlar uses seven elements in four groups. Its f/1.5 maximum aperture places it among the early post-war Japanese high-speed standard lenses.

History

Tokyo Optical, later known as Tokyo Kogaku, produced this lens for the Leotax system around 1950. The Simlar name predates the better-known Topcor branding used on later lenses.

Handling

The lens has a substantial chrome focusing barrel and a minimum focusing distance of approximately 1.07 metres. The filter field is left blank because accessible references disagree on the exact thread size.

Compatibility

This is a native Leica screw-mount lens with mechanical rangefinder coupling. It fits compatible LTM bodies and can be used on Leica M cameras with a suitable 50mm LTM-to-M adapter.

Sources