Aetna Coligon 135mm f/3.5 Auto
This camera glass has a 135mm focal length and a maximum aperture of f/3.5. It is a photographic lens with six lens elements that are coated to reduce reflections and increase contrast. The build quality of this lens is good and it can produce sharp images with good resolution. The bokeh, or the quality of the out-of-focus areas, is decent. This lens is a manual focus lens, which means that the photographer needs to adjust the focus manually. This lens does not have autofocus. The manufacturing time of this lens is not known. There are alternative lenses available in the market with similar specifications.
Has 6 aperture blades, this number of blades are commonly used. Having rounded blades provides out of focus circle shape closer to a circle. Average brightness in this league