The first of these I bought was the Aico (old version) 35mm F3.5 lens. I tested it for UV and found it did transmit fairly deep into UV. Hence I started to collect these in the various rebadged versions you can see below. The only ones missing are the Prinz branded, and the new version Spiratone.
These enlarger lenses are triplets, which are supposedly fairly well corrected although not APO. The smaller ones are the older versions, while the ones with more prominent ‘hoods’ are the newer models. The optical formula and coatings seem to be the same, only differing in the body construction & number of aperture blades.
These lenses can be a building block for the smallest UV-imaging system; especially when paired with the Olympus E-PM1 or E-PM2 (or even the Olympus E-PL5) – use the Olympus FL-300R with this and that would be the most compact UV-imaging system including UV light source.