KMZ Jupiter-11 135mm f/4 Experimental | Red "P" | 12-Blade Bokeh [Tested]

Overview

Elevate your photography or collection with a truly rare piece of Soviet optical history. This is a highly sought-after, early experimental version of the legendary Jupiter-11 135mm f/4, manufactured during the absolute peak quality era of the KMZ (Krasnogorsk Mechanical Factory).

Unlike standard rangefinder or later M42 versions, this unique transitional model features a rangefinder-style compact aluminum body barrel but utilizes an SLR flange focal distance (Zenit M39). Equipped with the premium early Red "P" (П) anti-reflective coating and a massive 12-blade aperture, this lens delivers a signature ultra-smooth, "creamy" vintage bokeh that modern digital lenses simply cannot replicate.

Why This Specific Version is Special:

• Transitional Experimental Design: Rangefinder aesthetics combined with an SLR focal registry (Zenit M39).
• Ultra-Compact & Lightweight: At just ~260g (9.2 oz), it is approximately 15% lighter and 2 cm (0.8") shorter than the standard SLR versions, making it an ideal choice for compact setups and everyday carry.
• 12-Blade Circular Aperture: Keeps the aperture perfectly round at any f-stop, resulting in breathtaking background separation and perfectly round light circles.
• Early Premium Quality: Features the iconic Red "P" coating, known for its distinct color rendering and classic vintage contrast.

Compatibility (DSLR & Mirrorless Cameras)

Because this specific experimental version features the SLR-standard flange focal distance (Zenit M39), it is incredibly versatile. Unlike standard rangefinder M39 lenses, this lens can achieve infinity focus on both DSLRs and Mirrorless cameras using the appropriate adapter:

• DSLR Cameras: Can be adapted with infinity focus to systems like Canon EF, Pentax K, M42 (via a simple M39-M42 step-up ring), and others. For Nikon F, it can be used natively for macro/close-up photography or with a glass-corrected adapter for infinity focus.
• Mirrorless Cameras: Works flawlessly with infinity focus on all modern systems via an M39 adapter, including Sony E-mount, Fujifilm X, Canon RF, Nikon Z, Leica L, and Micro Four Thirds (Olympus, Panasonic, Lumix). Perfect for both Full-Frame and Crop (APS-C/MFT) sensors.

Technical Specifications:

• Focal Length: 135mm
• Aperture Range: f/4.0 – f/22
• Optical Design: Legendary Sonnar Formula (4 elements in 3 groups)
• Lens Mount: M39 (Zenit SLR thread, 45.2mm flange distance)
• Minimum Focus Distance: 3 meters (approx. 9.8 feet)
• Aperture Blades: 12 (perfectly circular)
• Filter Diameter: 40.5mm
• Sensor Coverage: Full Frame / 35mm Film
• Body Material: Aircraft-grade Aluminum
• Weight: ~260 g (9.2 oz)
• Manufacturer: KMZ (Krasnogorsk), USSR
• Focus Type: Manual Focus Only

Condition Report

• Optics: Excellent / Near Mint. The glass elements are clean and clear. No fungus, no heavy scratches, no separation, and no haze. Note: As with any vintage lens, minor internal micro-dust particles may be visible under harsh light, which is completely normal and has zero impact on image quality.
• Mechanics: The manual focus ring turns smoothly and evenly. The 12-blade preset aperture mechanism functions perfectly and the blades are clean and free of oil.
• Cosmetics: Beautiful vintage condition with only minor signs of light use on the aluminum barrel, consistent with its age.

Note: All photos shown in this listing are actual high-resolution images of the specific lens you will receive.

What’s Included in the Box:

1. Jupiter-11 135mm f/4 Lens (M39 Zenit Mount)
2. High-Quality Hard Case (Non-original, but a very sturdy, premium custom-fit case for safe storage)
3. Original Soviet 40.5mm Yellow Filter (Excellent for adding dramatic contrast to Black & White photography)
4. Original Rear Lens Cap
5. Original Rigid Plastic Lens Hood (Fits tightly and securely)