NiSi Cine Lens Athena Prime 35mm T1.9 Fuji G-Mount

NiSi Athena Prime 35mm T1.9 (Fuji G-Mount) — Fast T1.9 with Drop-In Filter and 46mm Image Circle

This NiSi Athena Prime 35mm T1.9 in Fuji G-Mount delivers the optical characteristics filmmakers expect from the Athena series. It shares the series’ design goals: consistent T-stops across many focal lengths, a large 46mm image circle for full-frame and large-format sensors, and a Drop-In filtration option on G-Mount bodies for flexible creative control.

Who this lens is for

Use this 35mm Athena Prime if you are a cinematographer or videographer who needs a fast T1.9 prime that integrates with a matched lens set. It suits narrative shoots, interviews and projects where soft bokeh and reliable exposure across a lens set matter.

Key optical features

• Fast maximum aperture of T1.9 for the 35mm model, enabling shallow depth of field and pleasing background separation.
• Large 46mm image circle, making the lens compatible with full-frame and large-format sensors.
• Ultra-low chromatic aberration and micro-contrast control for finer image detail and accurate color render.
• Minimized focus breathing, so changes in field of view when pulling focus remain extremely small.

Mounts, filtration and important notes

The Athena Prime series is available in several mount options. For the 35mm specifically, Fuji G-Mount is offered with the Drop-In filter system. Other series mounts include ARRI PL, Canon RF, Sony E, and Panasonic/Leica L, with differences in filter implementation across mounts:

• RF, L and G mounts: Drop-In filter option available.
• E-Mount: offered in two versions — with and without Drop-In filter.
• PL-Mount: uses a rear filter configuration.

Important: Use the Drop-In clear filter on RF, L, G and E-mount versions and the rear filter on PL-mount versions to achieve infinity focus and obtain clear images. Also note that Sony FX9 cameras cannot use the E-Mount with Drop-In filters.

NiSi supplies weather sealing for the Drop-In filter to protect the filtration area during shoots.

Handling, ergonomics and matching across the set

• All Athena Prime lenses are similar in weight, so you generally do not need to rebalance a gimbal when switching between Athena lenses.
• With the exception of the 14mm lens, Athena primes share a 77mm front filter thread.
• Aperture and focus rings are matched across the range for consistent tactile response.
• Focus rotation is 300° across the line, allowing precise focus pulls.
• Fluorescent focus scales appear in both imperial and metric units to help during run-and-gun and scripted focus pulls.
• Standard 0.8 mod focus and iris gears ensure compatibility with common follow focus and matte box systems.

Accessories and close-up options

NiSi offers a 77mm close-up lens (sold separately) that reduces minimum focus distance and creates strong macro effects when needed. This accessory expands creative possibilities without changing the core lens setup.

Technical specifications

FAQ

Question: Will the 35mm G-Mount Athena work on full-frame and large-format sensors?

Answer: Yes. The Athena lenses have a 46mm image circle, which makes them suitable for use on full-frame and even large-format sensors.

Question: Do I need to use a specific filter to get infinity focus?

Answer: Yes. For RF, L, G and E-mount versions, the Drop-In clear filter must be used to achieve infinity focus and clear images. For PL-mount lenses, use the rear filter. Also remember the Sony FX9 cannot use the E-Mount Drop-In filter version.

Question: Are these lenses easy to swap on a gimbal or follow focus rig?

Answer: The Athena lenses are designed to be similar in weight and to share matched aperture and focus ring positions. That reduces the need to rebalance a gimbal when you switch lenses, and the standard 0.8 mod gears make them compatible with common follow focus systems.

Question: Can I get close-up or macro looks with the 35mm Athena?

Answer: Yes. NiSi offers a 77mm close-up lens (sold separately) that reduces the minimum focus distance and creates strong macro effects when attached.