MIR-20M 20mm f/3,5 Wide Angle Soviet Russian SLR lens M42 #000305. Focal length – 20mm. Minimum Aperture – 16. Maximum Aperture – 3.5. Aperture blades – 6. The diaphragm works properly in manual and automatic mode. The focus is a little tight, but it rotates smoothly. Glasses are clean and clear. Some tiny dust particles inside the lenses. Please check all photos carefully as they are part of the description. Front and rear caps, 3 light filters, original leather case are included. You will get exactly what you see in the photo. Any questions or need more information/photo/video? Feel free to ask questions!