2/3" (B4) Relay
1/2" Relay
1/3" Relay

Carl Zeiss 85mm ZF, Letus Ultimate, 1/2” Full Frame Relay, and Sony PMW-EX3

The Letus Relays are a specially designed lenses that allow you to remove the lens from your 1/3”, 1/2”, or 2/3” removable lens camera and attach the Letus35 adapters right to the camera body. The Relay must be used in conjunction with a Letus adapter (excluding the Mini), it can not be used by itself or with 3rd party adapters.

Some of the key benefits of using an adapter are:

• Academy and Full frame versions¹⁾
• Prime lens (no need to zoom during setup)
• High speed lens, typically faster than stock lenses
• Lockable focus
• Lockable iris/aperture
• Typically shorter than stock lenses

The Academy frame relays are designed to work with academy frame lenses (Angenieux, Arri, Cooke, etc.). These Relays are set to the 1.5 academy frame size. You can use either academy frame or full frame (including SLR) lenses with this relay. If you use full frame lenses just be aware of the 1.5 crop factor of the Relay.

• 2/3” B4 Pro
• 2/3” B4 Compact
• 1/2” Relay (academy version)

The Full frame relays are designed to work only with full frame lenses. These relays are set the the full 35mm frame size (photographic frame). You can only use full frame lenses on these relays, you can not use academy frame lenses.

• 1/2” Relay (full frame version)
• 1/3” Relay

The Letus relays are specifically designed to work with Letus adapters and the corresponding sensor size of removable lens cameras. Even though using a 2/3” Relay on a 1/2” camera will technically work (using an adapter), it is not recommended. The reason for this is that you will have significant cropping, the 2/3” Relay has a 1.5 crop factor (academy frame) add that to the crop factor of the 1/2” sensor and a 50mm FOV becomes almost a 115mm FOV.

Letus Relays product page