3M-7 300mm f/5.6
This camera glass has a fixed aperture of f/5.6, which may not be ideal for low light photography but can produce pleasing bokeh. It is a manual focus photographic lens with multiple lens elements and lens coating to reduce reflections and flare. The manufacturing time of this lens is not specified. The build quality is good, and it can produce high resolution images. There are alternative lenses available with different mounts and autofocus capabilities, but this lens is suitable for those who prefer manual focus and do not require a high aperture.
Has no aperture blades, this is among the rare lens which does not have aperture control function, works always wide open. Not the best in low light conditions but the lack of high aperture can be compensated with higher iso
81 mm long, requires consideration if you want to carry in the camera bag. Weights 470 grams so plan ahead, carry only if really necessary. With a lens filter diameter of 67 mm commonly filter size, presents numerous filter possibilities.