Contax 45mm F/2.8 Tessar T* MM C/Y Mount Lens {49}

Contax 45mm f/2.8 Tessar T*: Carl Zeiss glass for C/Y shooters

The Tessar design has been a benchmark for compact, high-resolving optics for over a century, and Contax's 45mm f/2.8 T* version brings Zeiss's multi-coating to the C/Y mount system. The T* coating cuts flare and ghosting in ways that matter when you're shooting toward window light or in mixed artificial environments. At f/2.8, this focal length sits right between a normal 50mm and a wide 40mm, giving you a field of view that reads as natural without the mild compression a 50mm introduces.

The MM (MultiMode) aperture coupling means this lens works with the full program and aperture-priority modes on MM-compatible Contax bodies, not just manual and aperture-priority. Manual focus is smooth and deliberate, the way Zeiss-era glass tends to be. The 49mm filter thread keeps front accessories small and affordable.

For adapters shooting C/Y glass on Sony E, Leica M, or Fuji X bodies, this lens represents a legitimate way into Zeiss optics without the weight or filter diameter of larger primes. The price of admission for T* coatings and Tessar resolving character at this size is hard to argue with.

Who It's For

Rangefinder-style street photographers will find the 45mm field of view sits naturally for candid work, wide enough to include context but tighter than a 35mm. Film shooters running Contax RTS or Aria bodies get the full MM coupling and metering integration the system was designed for. Mirrorless adapters chasing Zeiss rendering on modern sensors can use this with a C/Y adapter on Sony E or Fuji X mounts, keeping the overall kit compact thanks to the 49mm filter thread. Travel photographers who want a light, single-prime kit benefit from the Tessar design's balance of small size and optical resolve.

Key Features

• Tessar T* optical design with multi-coated glass
• 45mm focal length, f/2.8 maximum aperture
• Contax/Yashica (C/Y) mount with MM aperture coupling
• Manual focus with smooth, deliberate action
• 49mm filter thread for compact accessory compatibility

FAQ

What does the MM (MultiMode) designation mean for compatibility?

MM coupling allows this lens to work with program and aperture-priority exposure modes on MM-compatible Contax bodies, not just manual and aperture-priority like older C/Y glass.

How does the 45mm focal length compare to a standard 50mm?

The 45mm reads as natural without the mild compression a 50mm introduces, sitting between a true normal lens and a wider perspective.

What's the practical benefit of T* coating on this lens?

T* multi-coating cuts flare and ghosting in mixed lighting and backlit situations, which matters when you're shooting toward window light or under artificial light sources.

Is this lens viable for adaptation to modern camera systems?

Yes. The compact 49mm filter thread and Zeiss optical character make it a legitimate entry into T* glass for adapters shooting on Sony E, Leica M, or Fuji X bodies.

What kind of manual focus experience should I expect?

The focus action is smooth and deliberate, typical of Zeiss-era glass from this period.

How small is the filter thread compared to other Tessar designs?

The 49mm thread keeps front accessories small and affordable relative to larger Zeiss primes of similar aperture.

What optical formula does this lens use?

The Tessar design, which has been a resolving benchmark for compact optics for over a century.