NiSi Cine Lens Athena Prime 85mm T1.9 L-Mount

NiSi Cine Lens Athena Prime 85mm T1.9 L-Mount – T1.9 aperture for soft bokeh and L-Mount compatibility

This NiSi Athena Prime 85mm in L-Mount delivers the T1.9 maximum aperture that the Athena series is known for, making it suitable for portrait work and shots that require background separation. The 85mm shares the key design and mechanical features of the Athena Prime line, offering filmmakers a consistent handling and image quality experience.

Designed for filmmakers and videographers

The Athena Prime series targets cinematographers and videographers who need consistent optics and robust mechanical design. The 85mm T1.9 provides a shallow depth of field and soft bokeh, while remaining matched to the rest of the Athena lineup for quick lens changes during a shoot.

Optical characteristics and exposure consistency

NiSi measures light transmission using T-stops to ensure consistency across focal lengths. The 85mm has a maximum aperture of T1.9, which helps achieve attractive background separation. Across the series, the T-stop ratings are specified so you get predictable exposure when swapping lenses during production.

Image circle and sensor compatibility

The Athena Prime lenses generate an image circle of 46mm. Therefore, they suit full-frame and even larger-format sensors, providing coverage for a wide range of camera systems used in professional filmmaking.

Mounts and rear filtration system

The Athena Prime series is available in multiple mounts: ARRI PL, Canon RF, Sony E, Panasonic/Leica L and Fuji G. For flexible filtration, NiSi has implemented a proprietary rear filtration system with Drop-In filter capability. Note the mount-specific options:

• RF-, L- and G-Mount lenses feature a Drop-In filter option.
• E-Mount lenses will be offered in two versions: with and without a Drop-In filter.
• PL-Mount lenses utilize a rear filter.

To achieve infinity focus and clear images, it is important to use the Drop-In clear filter on RF, L, G and E mounts, and to use the rear filter on PL-mount lenses.

• Note: The Sony FX9 camera cannot use the E-Mount with Drop-In filters.

NiSi also supplies a weather-sealed solution for the Drop-In filter, improving reliability in challenging shooting conditions.

Mechanical consistency and handling

The Athena Primes are engineered to provide consistent handling across the set. All lenses in the series are similar in weight, so you do not need to rebalance a gimbal when switching between Athena lenses. The 85mm follows this pattern.

Except for the 14mm, Athena lenses share a 77mm front filter thread, making filter use straightforward when you switch lenses. Aperture and focus rings are matched across the range for uniform feel.

Focus control and gearing

The Athena Primes offer a 300° focus rotation and fluorescent focus scales marked in both imperial and metric units to facilitate precise focus pulls. The lenses use standard 0.8 mod focus and iris gears, ensuring compatibility with common follow focus and matte box systems.

Minimized focus breathing and image refinement

NiSi designed the Athena Primes to minimize focus breathing. This means the change in field of view when adjusting focus from minimum focus distance to infinity is extremely small. In combination with ultra-low chromatic aberration and micro-contrast control, the lenses deliver finer image detail and predictable optical performance.

Accessories

• NiSi 77mm close-up lens (sold separately) can reduce the minimum focus distance and produce macro-style effects when needed.

FAQ

Question: Is the 85mm Athena Prime available for L-Mount and does it support Drop-In filters?

Answer: Yes. The 85mm is available in L-Mount, and the Athena series offers a Drop-In filter option for L-Mount lenses. Using the Drop-In clear filter is important to achieve infinity focus and clear images.

Question: Will swapping Athena lenses require gimbal rebalancing?

Answer: No. Athena Prime lenses are similar in weight across the series, so you generally will not need to rebalance a gimbal when switching between lenses, which speeds up shooting workflows.

Question: Are the focus and iris gears compatible with industry-standard follow focus systems?

Answer: Yes. The lenses use standard 0.8 mod focus and iris gears, and both aperture and focus rings are matched across the range for consistent operation with follow focus and matte box systems.

Question: Can I use the E-Mount Drop-In filter version on a Sony FX9?

Answer: No. The Sony FX9 camera cannot use the E-Mount with Drop-In filters. If you plan to shoot on an FX9, choose the appropriate configuration or consult NiSi compatibility notes for alternative solutions.