Cosina 28mm f/2.8 MC Cosinon-W – MF Wide Prime – Pentax K Mount – Vintage

Description:
Cosina 28mm f/2.8 MC Cosinon-W manual-focus wide-angle lens for Pentax K mount, in excellent condition. This compact prime delivers solid center sharpness, vibrant color rendition, and a close-focus distance of just 25cm, making it ideal for landscapes, street photography, and everyday shooting.

The lens features multi-coating (MC) for improved contrast and flare control, and a lightweight all-metal construction. It’s compatible with all Pentax K-mount film bodies and digital DSLRs in manual and aperture-priority modes.

Very Good Condition

Key Features:

• Focal Length: 28mm
• Maximum Aperture: f/2.8
• Mount: Pentax K (manual focus)
• Optical Design: 5 elements in 5 groups
• Minimum Focus Distance: 0.25m
• Maximum Magnification: ~0.14×
• Filter Thread: 49mm
• Aperture Blades: 5
• Build: All-metal barrel
• Weight: ~140–155g
• Dimensions: ~62 × 34mm

Included:

• Cosina 28mm f/2.8 MC Cosinon-W lens (Pentax K mount)
• Front and rear caps
  

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Collector Notes:
This lens is known for its compact size, decent sharpness when stopped down (best at f/5.6–f/11), and surprisingly good flare resistance. Wide open, corners may show softness and vignetting, typical of vintage wide-angle designs. The 5-blade aperture produces geometric bokeh highlights, and the close-focus capability adds versatility. Often rebranded as Vivitar or Miranda, this lens is a hidden gem for collectors and film shooters alike.