Fortron Automatic 135mm 1:2.8 lens

The Fortron Automatic 135mm f/2.8 lens is a manual focus telephoto lens. Here's an overview of its features:

1. Focal Length: The lens has a fixed focal length of 135mm, making it a telephoto lens. This focal length is ideal for portrait photography, as well as capturing distant subjects such as wildlife and sports.

2. Aperture: The maximum aperture of f/2.8 allows for good low-light performance and shallow depth of field, enabling photographers to isolate their subjects from the background and achieve pleasing bokeh effects.

3. Auto/Manual Aperture: The "Automatic" designation suggests that the lens may have an automatic aperture diaphragm, which means that the aperture can be controlled electronically by the camera body. However, it may also feature manual aperture control.

4. Optical Construction: The lens likely consists of multiple lens elements arranged in groups to correct for aberrations and deliver sharp images with good contrast and color rendition.

5. Mount Compatibility: Depending on the lens mount, it may be available in different versions to fit various camera systems, such as Canon FD, Nikon F, or Pentax K mounts, among others.

6. Build Quality: Fortron lenses typically feature solid build quality with metal and high-quality plastic construction. However, specific details about the construction and build materials of this particular lens may vary.

7. Manual Focus: Like many vintage lenses, the Fortron Automatic 135mm f/2.8 lens features a manual focus control. This allows photographers to precisely control focus according to their creative vision.

8. Adaptability: With the appropriate adapter, the lens may be compatible with modern digital cameras, although functionality such as autofocus and electronic aperture control may be limited or unavailable.