This is a modified Olympus Pen EE2 camera lens, the Zuiko 28mm f3.5, adapted for a Sony NEX-E mount (metal). The original brass mount plate at the rear of the lens was cut off, the shutter blades were removed, the aperture blades were cleaned, and the lens elements were completely disassembled and cleaned (they are clean). Also, a spring was attached so that the aperture blades operate when the manual aperture ring on the lens barrel is turned, and both ends are soldered to prevent them from coming off (see photo). This allows you to set the aperture to any desired value. In addition, an aluminum ring was attached (glued) to the exposed part of the lens barrel to improve the appearance of the lens (photo 8). This lens is a fixed-focus lens. The Pen EE2 was originally a fixed-focus camera, so this lens is also a fixed-focus lens. It is designed to focus at a distance of approximately 1.5 m. This is the optimal shooting distance for snapshots, and the advantage is that the shutter can be released quickly because there is no AF operation time. When shooting, there is no need to worry about the focus being off if the aperture is around f/16 because the depth of field is deep. By the way, the depth of field becomes deeper at f/22, but the focus becomes softer due to diffraction in digital photography. This is because this lens is from the film era and was not designed for digital use. f/8 to f/16 is recommended. The area around the rear lens element has been painted with light-shielding matte paint. The lens diameter is 43.5mm, and a lens filter is included. A metal hood is also included, but it is 43mm, so it is not a perfect fit, but it will stop when screwed in and will not fall off. The lens cap is Konica-made, but it can also be used for Sony, so it is included. Photos taken with a SONY NEX7, color STD, f/8, and no correction are at the end. To see the characteristics of the lens rendering, I deliberately shot into the backlight. The last flower photo is in oblique light. Flare is likely to occur, so a hood is essential, but I think the flare photos without a hood are also exquisite. The camera side is set to aperture priority auto and shutter release permission. This lens is for APS-C size due to the image circle. No returns or refunds. 1000 lenses are sleeping in my home's dehumidifier. I am disposing of them before they become inheritance items. Please see my profile for the reason for letting them go.