The Comura 105mm f2.5 is a telephoto lens made by Sankyo Koki. Known for its affordable large-aperture mid-telephoto lenses available in various mounts like Leica L-mount and M42, this particular version is in the Alpa mount, which is extremely rare!

Notably, there is no mention of this specific lens in Alpa's documentation, either from Japan or France or Switzerland, making this a highly unique find. This is the first time I've seen one of these myself!

The lens features a 4-group, 5-element Ernostar-type design, with an amber and faint purple coating. It has a minimum focusing distance of 1 meter, a 48mm filter thread, and weighs about 398g. This lens is a true collector's item, offering a rare piece of photographic history with impressive optical characteristics.

The Comura 105mm f2.5 in Alpa mount is in excellent condition with minimal signs of use. The paint and chrome plating still maintain a new-like appearance, and the overall aesthetic is clean and well-preserved.

It has undergone a full overhaul in February 2025, with smooth operation of the aperture and focusing ring, offering a pleasant shooting experience. There are just a few very light micro scratches on the front element, but no haze or significant marks, leaving the glass in clear and excellent condition.

When mounted on an Alpa body, the lens may have a loose fit with the mount, meaning that even if the locking mechanism is engaged, the lens might detach when pressure is applied. This is likely due to the inherent design of the mount from the time of manufacture, and unfortunately, there is no practical way to fix this. This is an important consideration for anyone intending to use it with an Alpa camera body.

This lens is a rare gem, perfect for anyone who enjoys owning unique pieces and is looking for something no one else has in their collection!