NiSi Cine Lens Athena Prime 18mm T2.2 G-Mount (Without Drop-in Filter)

NiSi Athena Prime 18mm T2.2 G-Mount — 18mm wide-angle prime with T2.2, G-Mount (without Drop-In filter)

This listing covers the NiSi Athena Prime 18mm lens in G-Mount with a maximum aperture of T2.2. It is sold without the Drop-In filter. The Athena Prime series is a set of cinema lenses designed for filmmakers and videographers, and the 18mm is the wide-angle option in that range.

Key features of the Athena Prime 18mm

• Focal length: 18mm wide-angle prime.
• Maximum aperture: T2.2 for the 18mm model.
• Mount: Fuji G-Mount for this specific listing.
• Drop-In filter: this 18mm G-Mount unit is supplied without the Drop-In filter.
• Image circle: 46mm, suitable for full-frame and large-format sensors.
• Matched mechanics: aperture and focus rings are matched across the Athena series for consistent handling.

Optical range and aperture information (series-wide facts)

The Athena Prime series spans focal lengths from 14mm to 135mm. That range covers super-wide angle to portrait focal lengths, giving you options for many shooting scenarios.

• 14mm: T2.4
• 18mm: T2.2 (this product)
• 25mm, 35mm, 40mm, 50mm, 85mm: T1.9
• 135mm: T2.2

These T-stop ratings reflect the actual light transmission through each lens and help maintain consistent exposure across the series.

Compatibility, mounts and the Drop-In filter system

The Athena Prime series is available in multiple mount options. The series comes in ARRI PL, Canon RF, Sony E, Panasonic/Leica L and Fuji G mounts. Mount-specific filtration options apply:

• RF-, L- and G-Mount lenses have a Drop-In filter option in the series.
• E-Mount lenses are offered in two versions: with and without a Drop-In filter.
• PL-mount lenses utilize a rear filter.

Important notes about filters and infinity focus:

• The RF-, L-, G- and E-mount lenses require the Drop-In clear filter to achieve infinity focus and clear images when that filtration system is applicable.
• PL-mount lenses require the rear filter to achieve infinity focus and clear images.
• Sony FX9 cameras cannot use the E-Mount version with Drop-In filters.

Also note that NiSi supplies weather sealing for the Drop-In filter assembly as part of the system.

Optical performance and image characteristics

The Athena Prime design emphasizes low chromatic aberration and micro-contrast control. The lenses aim to deliver finer image detail and consistent exposure across the series. Additionally, the Athena primes have been designed to minimize focus breathing, so the change in field of view when you rack focus from minimum focus distance to infinity remains very small.

Mechanics, handling and accessories

The Athena primes share a consistent mechanical design to simplify workflow on set:

• All lenses (except the 14mm) use the same 77mm front filter thread, making front-filtering workflow consistent across most focal lengths.
• All lenses are similar in weight, which means you do not need to rebalance a gimbal when switching between Athena lenses.
• Both aperture and focus rings are matched across the range for uniform feel.
• Focus rotation is 300° for precise pulling, and focus scales are fluorescent with both imperial and metric markings for high visibility and accuracy.
• Standard gear modulation: 0.8 mod focus and iris gears for compatibility with common follow focus and matte box systems.

For close-up work, NiSi offers a 77mm close-up lens (sold separately) to reduce minimum focus distance and produce macro-like effects when required.

Specification

Notes for buyers

• This product listing is for the NiSi Athena Prime 18mm T2.2 in G-Mount and is supplied without the Drop-In filter.
• If you plan to use the Athena series’ Drop-In filtration system on RF-, L-, G- or E-mount variants, you must install the Drop-In clear filter to achieve infinity focus and clear images.
• Consider the 77mm NiSi close-up lens (sold separately) if you need reduced minimum focus distance for macro-style shots.

FAQ

Question: Will this 18mm G-Mount lens achieve infinity focus without a Drop-In filter?
Answer: No. For the RF-, L-, G- and E-mount Athena lenses, the Drop-In clear filter (or the appropriate rear filter for PL) is required to achieve infinity focus and obtain clear images. This specific 18mm G-Mount listing is supplied without the Drop-In filter, so you should plan to acquire the correct Drop-In clear filter if you need infinity focus on compatible bodies.

Question: Can I use this 18mm lens on a gimbal without rebalancing when swapping lenses?
Answer: Yes. The Athena primes are similar in weight and designed so you do not need to rebalance a gimbal when switching between Athena lenses.

Question: Does the 18mm share filter threads with other Athena primes?
Answer: Yes. All Athena lenses except the 14mm use the same 77mm front filter thread, so the 18mm is compatible with that common thread size.

Question: Is there a weather-sealed option for Drop-In filters?
Answer: NiSi provides weather sealing for the Drop-In filter assembly. That weather sealing applies to the Drop-In filter system offered with RF-, L- and G-Mount lenses in the series.

Question: How does the lens handle focus pulls and focus breathing?
Answer: The Athena primes feature a 300° focus rotation and fluorescent focus scales in both imperial and metric units for precise focus pulls. The series is also designed to minimize focus breathing so that changes in field of view during focus pulls are kept to a minimum.