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

NiSi Cine Lens Athena Prime 85mm T1.9 Fuji G-Mount – T1.9 aperture with 46mm image circle for full-frame and large-format use

The NiSi Athena Prime 85mm T1.9 in Fuji G-Mount is part of the Athena Prime series, designed for cinematographers and videographers who need consistent optical performance across a wide focal range. This 85mm prime shares the series’ optical philosophy: high light transmission, controlled aberrations, and practical features for professional workflow.

Key optical characteristics

• Maximum aperture: T1.9 — provides a bright working aperture and enables shallow depth of field for pleasing background separation.
• Image circle: 46mm — large enough to cover full-frame and many large-format sensors, making the lens suitable for a wide range of cameras.
• Ultra-low chromatic aberration and micro-contrast control — designed to deliver finer image details and reduce color fringing.
• Minimal focus breathing — the change in field of view while pulling focus from close distance to infinity is very small, which helps maintain shot consistency during focus pulls.

Series context and aperture consistency

The Athena Prime collection spans focal lengths from 14mm to 135mm, covering super-wide to portrait focal lengths. Within the series, several primes share the same maximum aperture:

• 25mm, 35mm, 40mm, 50mm and 85mm — all have a maximum aperture of T1.9.
• 18mm and 135mm — maximum aperture of T2.2.
• 14mm — maximum aperture of T2.4.

Because the 85mm matches other mid- and short-telephoto primes at T1.9, you can expect consistent exposure and look when swapping lenses in this segment of the set.

Mounts, drop-in filtration and important usage notes

The Athena Prime series is available in multiple mounts, and the Fuji G-Mount version includes a Drop-In filter option. This rear filtration system gives filmmakers more creative control and flexibility for image correction and effect filters.

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

Important: It is necessary to use the Drop-In clear filter on RF-, L-, G- and E-mount lenses, and to use the rear filter on PL-mount lenses, to achieve infinity focus and obtain clear images. Additionally, Sony FX9 cameras cannot use the E-Mount version with Drop-In filters.

NiSi also provides a weather-sealed option for the Drop-In filter to protect the rear filtration system in variable shooting conditions.

Handling, compatibility and rigging

• All Athena Prime lenses are similar in weight — they do not require rebalancing on a gimbal when switching between Athena lenses. This applies across the series and benefits multi-lens setups on stabilizers.
• Filter thread: the 85mm shares the series’ 77mm front filter thread (all lenses except the 14mm use the 77mm thread), simplifying matte box and filter workflows.
• Aperture and focus rings are matched across the lens range — this ensures consistent torque and feel when changing lenses during a shoot.
• Both focus and aperture rings use standard 0.8 MOD gears, making the lens compatible with a wide range of follow focus and iris systems.
• Focus rotation: 300° of rotation with fluorescent focus scales in both imperial and metric units — these features support precise focus pulls and easy visibility on set.

Accessories and modular options

• NiSi 77mm close-up lens (sold separately) can reduce the minimum focus distance and create macro effects when additional close-up capability is required.
• The Drop-In filter system allows filmmakers to use rear-mounted filters for color correction, ND, and other creative filtration without front-mounted filter changes.

Frequently Asked Questions

Question: Will the Athena 85mm T1.9 G-Mount cover full-frame and larger sensors?
Answer: Yes. The lens has a 46mm image circle, which is designed to cover full-frame and many large-format sensors, making it suitable for a broad range of camera systems.

Question: Do I need to change camera balance when swapping to the 85mm from other Athena primes?
Answer: No. Athena primes are similar in weight and do not require rebalancing on a gimbal when switching between lenses in the series, helping you maintain stability and workflow efficiency on set.

Question: How does the Drop-In filter on the G-Mount affect use and focus?
Answer: The G-Mount version offers a Drop-In filter option for rear filtration. It is important to use the Drop-In clear filter on RF-, L-, G- and E-mounts (and the rear filter on PL-mount) to achieve infinity focus and clear images. NiSi also offers weather sealing for the Drop-In filter for added protection.

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 version that includes Drop-In filters. Plan mount choices accordingly when matching lenses to that camera.

Question: What accessories help extend the 85mm’s close-focus performance?
Answer: NiSi offers a 77mm close-up lens (sold separately) that reduces the minimum focus distance and enables macro-like effects when you need tighter close-ups.

This 85mm Athena Prime in Fuji G-Mount brings the series’ matched handling, T1.9 aperture, and large image circle to filmmakers seeking consistent exposure, matched ergonomics, and rear filtration flexibility for professional production use.