More info on the MS Optics Fluorit Super Apochromat Aporis 135mm f/2.4 lens for Leica M mount


Some additional information on the new MS Optics Fluorit Super Apochromat Aporis 135mm f/2.4 full frame lens for Leica M mount from Japan Camera Hunter (the lens is currently available for pre-order). There are two versions of the lens: one for Leica M cameras (coupled) and one for other mirrorless cameras (not coupled). Here is how Mr. Miyazaki came up with the idea for this lens:

Seven years ago, I designed an objective lens for a telescope that utilized fluorite glass. This experience taught me just how amazing this kind of glass is for correcting color aberrations. Thanks to the goodwill of Canon Optron, I too can now utilize this kind of glass.

I researched the fast 135mm focal length, which is the type of lens for which the most benefit can be expected, and after much effort designing something based on the low nd of 1.43, I decided to use an Ernostar optical design with its minimal coma. The front element is a large thick piece of fluorite to realize a high performance lens with a maximum aperture of f/2.4.

Leica M mount lens (coupled):

  • Ernostar type Fluorit Apochromat
  • Focusing – 1.6m to infinity
  • Adjusted for minimum SA and coma at 10m
  • ¥148,000 (ca. $1,300) for the coupled version, the 1.8x eyepiece magnifier is sold separately

Non-focus coupled version (for cameras with live view):

  • Manual floating mechanism for SA optimization
  • Manual floating mechanism for coma optimization
  • Manual floating enables the full potential of the lens to be used to achieve its best performance from 1.6m to infinity.
  • ¥135,000 (ca. $1,200) for the uncoupled version with spherical aberration and coma adjustment levers

Specifications:

  • SA -0.15 (extremely good)
  • AST -0.11 SM
  • Distortion: +-0.2 (1.6m to infinity)
  • f/2.4 is a bright aperture but contrast is high across the entire image plane (image at 15m)
  • At f/4 – f/5.6 image quality is extremely good


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