Carl Zeiss Jena Flektogon 25mm f/4
Carl Zeiss Jena Flektogon 25mm f/4 is a manual focus wide angle lens for full frame cameras.
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
52 mm long, requires consideration if you want to carry in the camera bag. Weights 362 grams so plan ahead, carry only if really necessary. 77 mm lens filter diameter, commonly filter size, you have plenty of possibilities this lens deserves a good quality filter.