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Equivalent focal length will be ~146mm, so a long portrait lens!
Quote: This is a prototype of the Sonnetar 25mm f/1.1 lens for the Pentax Q mirrorless camera by MS Optical. Miyazaki san, the man behind MS Optical, has created some unique lenses in the past (for example the Perar Super Triplet 28mm f/4 and the 3.5/35mm f/3.5 lenses for Leica M-mount).
More info at my [
SOURCE], and his sources, and their sources, etc.