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

NiSi Cine Lens Athena Prime 85mm T1.9 E-Mount – T1.9 aperture for soft bokeh and full-frame coverage

This page describes the NiSi Athena Prime 85mm T1.9 in Sony E-mount. It is part of the NiSi Athena Cine Lens series, a lineup of prime lenses designed for cinematographers and videographers. The 85mm model shares the series’ optical characteristics and mechanical design, while offering a T1.9 maximum aperture for strong background separation.

Key features

• Maximum aperture T1.9: The 85mm lens has a T1.9 maximum aperture, which makes it possible to achieve soft bokeh and clear background separation.
• Part of a wide focal range: The Athena series spans 14mm to 135mm, covering ultra-wide to portrait focal lengths; the 85mm sits in the portrait range within this set.
• Large image circle: The series provides an image circle of 46mm, making the lenses suitable for full-frame and large-format sensors.
• Mount options and E-mount versions: The Athena series is available in ARRI PL, Canon RF, Sony E, Panasonic/Leica L and Fuji G mounts. The Sony E-mount is offered in two versions: with and without a Drop-In filter option.
• Drop-In and rear filters: RF-, L- and G-mount lenses include a Drop-In filter option; PL-mount uses a rear filter. The E-mount offers both a Drop-In capable version and a version without Drop-In.
• Sony FX9 compatibility note: The Sony FX9 camera cannot use the E-mount version that includes Drop-In filters.
• Clear filter requirement for infinity focus: To achieve infinity focus and clear images, use the Drop-In clear filter on RF-, L-, G- and E-mount lenses and the rear filter on PL-mount lenses.
• Weather sealing: NiSi provides weather sealing for the Drop-In filter.
• Matched mechanics across the series: All Athena primes are similar in weight, so swapping lenses does not require gimbal rebalancing. Aperture and focus rings are matched across the range.
• Shared filter thread: Except for the 14mm lens, Athena primes share a 77mm front filter thread.
• Precision focus control: Lenses feature a 300° focus rotation and fluorescent focus scales displayed in both imperial and metric units for accurate focus pulls.
• Industry-standard gearing: The focus and iris gears use a standard 0.8 mod, ensuring compatibility with a wide range of follow focus and matte box systems.
• Optical performance notes: The series emphasizes ultra-low chromatic aberration, micro-contrast control, and consistent T-stop ratings across focal lengths. The design also minimizes focus breathing to keep changes in field of view very small when racking focus.
• Close-up option (sold separately): A NiSi 77mm close-up lens can reduce the minimum focus distance for macro effects.

Typical use cases

• Portraits and subject isolation using the 85mm T1.9 aperture for shallow depth of field.
• Full-frame and large-format productions that require consistent coverage across a prime lens set.
• Gimbal and multi-lens workflows where matched weight and ring placement speed lens changes without rebalancing.
• Professional follow-focus and matte box setups thanks to standard 0.8 mod gearing and matched ring positions.
• Macro or close-focus shots when paired with the optional 77mm close-up lens.

Technical specifications

Important notes

Always install the appropriate clear Drop-In filter on RF-, L-, G- and E-mount Drop-In versions, or the rear filter on PL-mount, to achieve infinity focus and clear images. Be aware that the Sony FX9 cannot use the E-mount version that includes Drop-In filters. NiSi supplies weather sealing for the Drop-In filter to maintain protection in varying shooting conditions.

FAQ

question: Can I use the E‑mount Athena 85mm with Drop‑In filters on a Sony FX9?
Answer: No. The Sony FX9 camera cannot use the E-mount version that includes Drop-In filters. Use the E-mount version without Drop-In or choose a compatible mount.

question: Will the 85mm Athena cover full-frame or large-format sensors?
Answer: Yes. The Athena series provides a 46mm image circle, which makes the lenses suitable for full-frame and large-format sensors.

question: Do I need the Drop‑In or rear filter to focus to infinity?
Answer: Yes. To achieve infinity focus and obtain clear images, use the Drop-In clear filter on RF-, L-, G- and E-mount Drop-In versions, or the rear filter on PL-mount lenses.

question: Will swapping Athena lenses require gimbal rebalancing?
Answer: No. All Athena primes are similar in weight and share matched aperture and focus ring positions, so switching lenses generally does not require rebalancing your gimbal.