Inon Z-330

Manufacturer: Inon
Type: Strobe
Year introduced: 2017 (first shipping December 24, 2017)
Year discontinued: 2022 (December 21, 2022 — official EOL announcement by Inon Corporation)
Guide number: GN 33 (land), vs GN 24 for the Z-240
Coverage: 110° underwater (without diffuser)
Color temperature: 5,500K (native)
Focus light: 220 lumen, shutter-linked auto-off, Fresnel lens alignment
Flash tube: Patented T-configuration twin flash tube
Flash modes: S-TTL Auto, Manual (13 steps, 1/2 EV increments)
Minimum GN: 4
Triggering: Optical (fiber optic slave sensor) and electrical (Nikonos-type 5-pin sync connector)
Power source: 4 x AA batteries (Eneloop Pro recommended)
Battery life: ~230-250 full-power flashes with Eneloop Pro; ~350+ at half power (^[1])
Recycle time: ~1.6 seconds at full power with fresh Eneloop Pro batteries (^[2])
Japanese retail price (Type 2): ¥75,800 excluding tax / ¥83,380 including tax (^[3])
US retail price: ~$650 at launch (Reef Photo, Backscatter); ~$699 before discontinuation (^[4], ^[5])
Australian retail price: A$1,169.94 at launch (Scubapix) (^[6])

Overview

The Inon Z-330 is the successor to the Inon Z-240, the industry-standard underwater strobe that Inon produced across multiple revisions from 2006 through 2017. The Z-330 delivers approximately one full stop more power than the Z-240 — GN 33 versus GN 24 — while maintaining the same compact body design and AA-battery power system (^[7]). It uses the same control layout and battery compartment as the Z-240, easing the transition for existing users (^[8]).

The Z-330 achieves its wider coverage and higher output through a patented front dome lens system. Unlike conventional translucent diffusers that widen coverage at the cost of power, the dome lens uses the refraction ratios of air, acrylic, and water to spread the light to 110 degrees underwater without any power loss (^[9]). Internally, the strobe retains Inon’s T-shaped twin flash tube design.

At its US launch price of approximately $650, it positioned directly against the Retra Flash at $829, sparking extensive community debate about which strobe offered better value (^[10]). By the time of its discontinuation, the price had risen to $699, and ChrisRoss on the forums noted the comparable Sea & Sea strobe had reached $799, reflecting industry-wide inflation (^[11]).

Development and Launch

The Z-240 was discontinued in June 2017, with Inon citing the upcoming replacement model (^[12]). The Z-240 had been so dominant that its discontinuation was itself a notable editorial event — the end of an era for a strobe that had powered a generation of underwater photographers.

A sneak preview of the Z-330 appeared in November 2017, when pre-orders surfaced on a French dealer website before Inon’s official announcement. Wetpixel published the first details, noting the GN 33 output and 110-degree coverage as “amazing specifications” (^[13]). Adam Hanlon observed that on paper, the Z-330 had “more power than any similar 4 x AA powered strobe” (^[14]).

Full specifications were published on December 15, 2017, with first shipments following on December 24 (^[15]). Initial availability was tight — some US dealers saw 3-4 month wait times, with forum members reporting orders placed in January 2018 not arriving until April (^[16]).

Key Design Features

Dome Lens System

The most significant engineering change from the Z-240 is the front dome lens. The Z-240 had a flat lens cover; the Z-330’s domed lens protrudes approximately one inch further forward. The dome lens is Inon’s patented solution for achieving wide coverage without the power loss inherent in conventional diffusers. Adam Hanlon’s underwater comparison testing confirmed the Z-330 was “significantly more powerful” than the Z-240 — approximately one full stop — with a beam “quite a bit wider” than the Z-240’s 100-degree coverage and “a lot softer” fall-off at the beam edges (^[17]).

Heat Management

The Z-330 addresses overheating concerns that plagued earlier Z-240 models with an integrated circular metal heat sink around the light-emitting area. This heat sink is made of aluminum (replacing the polycarbonate resin of the Z-240) and connects directly to internal circuit components, releasing heat into the surrounding water (^[18]). Forum member Phil Rudin detailed how the aluminum ring also connects to the threaded ring used for the light shade attachment, maximizing surface area for heat dissipation (^[19]).

Adam Hanlon tested heat tolerance extensively: over 600 full-power dumps in quick succession with the strobes immersed in 28°C (82°F) water showed no overheating issues, and subjective output remained at full power afterward (^[20]). This was a marked improvement over the Z-240, where users reported blackened tubes and melted capacitors from intensive use, particularly in warm tropical and cave diving environments (^[21]).

Strobe Light Shade (“Duckbill”)

The Z-330 ships with a rotating light shade — colloquially called the “duckbill” — designed to block light from hitting the camera’s dome port. The shade rotates 360 degrees with tactile click positions, suppressing ghosting, flaring, and backscatter when the strobe is positioned close to a lens port (^[22]). Later, Inon added optional reflective stickers for the light shade that bounce light to create more even illumination (^[23]). A neoprene Front Cover 110 was released in December 2018 to protect the dome lens during transport and storage, also fitting the D-200 strobe and Inon wide-angle wet lenses with Lens Hood II (^[24]).

Improved Controls

Control dials are enlarged compared to the Z-240 for better usability in cold water with thick gloves. Importantly, the power control knob now has physical stops at minimum and maximum power, unlike the Z-240’s continuously rotating knob that required visual verification of the setting. The back panel uses high-intensity phosphorescent material for visibility during night dives (^[25]). One change from the Z-240 was the removal of the External Auto feature, retaining only S-TTL, Low, and Manual modes (^[26]).

Focus Light

The 220-lumen focus light uses a Fresnel lens to align its optical axis with the strobe output for more accurate aiming. It is shutter-linked, quenching when the camera fires and automatically relighting afterward (^[27]).

Triggering and TTL Compatibility

The Z-330 supports both optical (fiber optic) and electrical (Nikonos 5-pin) triggering. Its enhanced slave sensor is designed to reliably detect even faint trigger signals from partially damaged fiber optic cables (^[28]). The strobe was confirmed compatible with Nauticam, UW Technics, and other TTL converters, sharing the same TTL profile as the Z-240 (^[29]). Adam Hanlon’s Red Sea field testing found TTL accuracy to be “very, very accurate” (^[30]). Previous fiber optic cables and mounts from the Z-240 are fully compatible (^[31]).

Known Issues: The “Bastard Button”

The Z-330’s most notorious ergonomic flaw is the pre-flash cancel circuit button — universally known in the community as the “bastard button” after Alex Mustard’s colorful description. When asked what the successor should improve, Mustard’s one-line response was simply: “And take off the b*stard button” (^[32]).

The problem actually involves two small controls:

1. Pre-flash cancel button — A spring-loaded button that must be depressed and twisted to lock. When accidentally unlocked (by brushing against arms, floats, or housing), the strobe drops to minimal output without warning. Users often only notice when reviewing images afterward (^[33], ^[34]).

2. Focus light switch — An inadvertent press activates the focus light, which then burns for several minutes before auto-shutting off, with no way to manually turn it off (^[35]).

Additionally, the power switch could be accidentally bumped from Manual to Full Dump mode while adjusting the power dial, causing unexpected full-power flashes (^[36]).

Forum user “Architeuthis” (Wolfgang) described diving in 5°C water with drygloves: “After having these strobes now since two years, I am trained to avoid pressing these ‘b*stard buttons’ unintentionally… but certainly 20x the learning curve compared to use a 45° viewfinder” (^[37]).

Community Workarounds

• Magnet screw replacement: ChrisRoss explained that users could remove the locking button and replace it with an Inon magnet screw (as used in the S-2000), permanently locking the cancel circuit. For manual flash with LED triggers, this had no functional downside (^[38]).

• 3D-printed “Button Blocker”: Dave Hicks designed and shared (via Thingiverse) a 3D-printed guard that fits over the Nikonos electrical socket, with a spring arm protecting the power switch and a cylinder covering the pre-flash button. He tested it across dozens of dives in both cold (40-50°F) and warm (90°F) conditions with no issues. Available for $20 + $5 shipping for those without printers (^[39]).

Another common complaint was the large Nikonos 5-pin electrical connector occupying prime space in the center of the strobe body. Forum user makar0n expressed the community sentiment: “Remove that damn giant electrical connection from the middle, nobody sane is using that” (^[40]).

Accessories

Dome Filter System

The Z-330 introduced a bayonet-mount dome filter system (not compatible with other Inon strobes). Filters include:

• Strobe Dome Filter SOFT — Bundled with the strobe; protects the dome lens and softens output with approximately -0.3 stops of light loss. Features a Fresnel design on the back side (^[41], ^[42]).
• Strobe Dome Filter ND — Reduces output by -4 EV for situations where minimum power is still too bright, such as balancing ambient light at dusk (^[43], ^[44]).
• Strobe Dome Filter 4900K — Warms color temperature from 5,500K to 4,900K. Shipped March 29, 2018 (^[45]).
• Strobe Dome Filter 4600K — Warms color temperature from 5,500K to 4,600K. Shipped March 29, 2018 (^[46]).

The warming filters were seen as a significant addition. Adam Hanlon called them “the missing ingredient” and expected them to make “a significant difference to the quality of light” (^[47]). Users shooting RAW with white balance set to match the filter temperature could achieve richer blue backgrounds while maintaining natural subject color (^[48]).

Snoot Set

Inon released the Snoot Set for Z-330/D-200 on January 29, 2019. The kit includes a brushed aluminum sleeve that screws onto the strobe’s heat sink threads, a two-stage telescopic rubber hood, step-up ring, and two restrictor tubes (10mm and 26mm inner diameter). The combination supports six different beam coverages from approximately 20 to 80 degrees, enabling spotlight effects, backscatter reduction, and subject isolation (^[49]).

Cold Shoe Mounting System

In December 2017, Inon shipped three cold shoe base variants (1/4-20UNC, M6, and BALL) for mounting strobes and lights onto housing accessory shoes. All three share a common cold shoe attachment and are interchangeable (^[50]).

Quick Holder System

In July 2019, Inon introduced the Quick Holder System for rapid installation and removal of compatible strobes and lights via a quick-release bracket, along with a Rotatable YS Extension Bar providing 360-degree swivel mounting (^[51]).

Retra LSD Compatibility

Retra produced a mounting kit for their Light Shaping Device (LSD) to work with the Z-330, available from May 11, 2018 at EUR 299. Retra noted that the Z-330’s angled pilot light works better as an aiming light with the LSD than the Z-240’s. They warned that the existing Z-240 mounting band would physically fit the Z-330 but was dangerously tight and could fail without warning — users needed the dedicated Z-330 mounting band (^[52]).

10bar Macro Snoot Set

Third-party manufacturer 10bar produced a macro snoot set compatible with the Z-330 (as well as Z-240, Sea & Sea YS-D1, YS-D2, and YS-D2J) (^[53]).

Type 2 Revision (2021)

On June 10, 2021, Inon released the Z-330 Type 2, featuring a redesigned dome lens with a “fly-eye” inner surface pattern that suppresses uneven light distribution for more ideal circular lighting. All other specifications remained identical to the original Z-330. The fly-eye pattern also widened the beam angle of the 220-lumen focus light through the dome lens (^[54]).

The D-200 strobe received a simultaneous Type 2 update with the same fly-eye dome lens improvement (^[55]).

Discontinuation and Successor

On December 21, 2022, Inon Corporation officially announced the discontinuation of the Z-330 Type 2. The announcement, translated from the Inon.co.jp website by Phil Rudin, stated: “Production of the underwater strobe ‘Z-330 Type 2’ will be discontinued. After that, please note that only the stock of each dealer will be sold… We are diligently developing a successor strobe to meet your expectations” (^[56]).

The S-2000 was also simultaneously discontinued (September 2, 2022 announcement) with a similar promise of a successor under development (^[57]).

Initial dealer reports attributed the discontinuation to chip sourcing problems (^[58]), but ChrisRoss doubted this was the sole reason: “I doubt the reason they discontinued was parts supply, they did this last time when they changed from Z240 to Z330 and the relatively minor upgrade from Z330 to type 2 occurred without any disruption to supply” (^[59]).

In January 2023, forum member Mags attended an Inon UK Open Day in Manchester with Takuya Torii, reporting that “problems with sourcing parts for Z330” were confirmed, and the S-2000 successor (later named the S-220) was expected within months. The Z-330 successor timeline was less certain — Architeuthis’s dealer estimated “at the earliest, in autumn” 2023 (^[60], ^[61]).

Phil Rudin speculated the successor could be a “Z-450 (give or take on the GN)” based on Inon’s naming pattern: Z-220 (GN 22), Z-240 (GN 24), Z-330 (GN 33) (^[62]).

Community wishlist items for the successor included: circular flash tube for better light quality, 18650 batteries instead of AA, removal of the “bastard button,” and removal of the Nikonos 5-pin connector (^[63]).

Users seeking Z-330 strobes after discontinuation had difficulty finding them, with some buying single units before stock ran out and struggling to find a matching second strobe (^[64]). As of January 2024, forum member “nomadadv” reported direct communication with Inon’s Takuya Tori confirming that work on a Z-330 successor was underway, but no timeline was given (^[65]).

Reviews & Discussion

Wetpixel Strobe Comparison (February 2018)

Adam Hanlon conducted a comprehensive multi-part strobe comparison testing the Z-330 alongside the Retra Flash and iTorch Symbiosis SS2. Testing spanned UK pool sessions, Caribbean use by Alex Mustard, and Red Sea field work at Torfa Ali dive site, hosted by Emperor Divers in Port Ghalib (^[66], ^[67]). Hanlon shot with a Nikon D500 and Nikon 8-15mm f/3.5-4.5 fisheye, swapping between the Z-330 and Retra Flash — sometimes shooting “a la Mustard” with one of each on opposite sides for direct comparison (^[68]).

Key findings:

• The Z-330 was approximately one stop more powerful than the Z-240 with a wider, softer beam edge (^[69]).
• Battery life was comparable to the Z-240 despite the higher power output (^[70]).
• The strobes could fire “pretty much continuously at half power at 4fps” for action shooting (^[71]).
• Heat management was dramatically improved over the Z-240, with no overheating observed even after 600+ full-power rapid-fire dumps in 28°C water (^[72]).
• TTL accuracy was “very, very accurate” (^[73]).

Phil Rudin Early Adopter Review

Phil Rudin was among the first to publish a review at UWPMAG.com (Issue 100), after shooting with the Z-330 on black water dives in Florida in December 2017 using an Olympus E-M1 II in a Nauticam housing. He reported positive performance (^[74], ^[75]).

Color Temperature Discussion

A notable criticism of the Z-330 is its relatively cool color temperature compared to strobes with circular flash tubes. Forum member Interceptor121 observed that “the Z330 look cooler than the old Z240,” and long-term user Andrej Oblak noted bluish skin tones even when using the 4600K warming filters at higher power settings (^[76]). Community consensus, including input from Alex Mustard, was that light quality differences between strobes are significant and that circular-tube designs (such as the Retra and OneUW strobes) generally produce warmer, more even light — though technique and strobe positioning matter more than equipment choice (^[77]).

Power Limitations for Full-Frame Wide-Angle

Forum member atus, who borrowed Z-330 strobes from a friend, reported “the poor quality of the light and the lack of power for a FF camera was an issue,” particularly for close-focus wide-angle (CFWA) shooting against the sun. He argued that no Inon strobe was powerful enough for CFWA at ISO 400, 1/200s, f/13 with a full-frame camera (^[78]). However, ChrisRoss countered that the Z-240 (and by extension the more powerful Z-330) was “quite adequate for wide angle on m43” at f/8 with the Panasonic fisheye (^[79]). The strobe market, ChrisRoss noted, had split between cheaper strobes with straight flash tubes and premium circular-tube designs (^[80]).

Community Discussion

• New Inon Z330 (108 replies) — The primary community thread tracking the Z-330 from pre-order through early user reports, including Adam Hanlon’s testing updates, power comparisons with the Z-240, recycle time data, heat testing results, battery life reports, and TTL compatibility confirmation (^[81]).
• Inon Z330 (Typ2) is set to EOL by Inon (23 replies) — Community reaction to the December 2022 discontinuation, with Phil Rudin translating the official Inon announcement, speculation about successor features (circular tube, 18650 batteries, better ergonomics), and reports from an Inon UK Open Day with Takuya Torii (^[82]).
• Inon Z-330 vs circular tube strobes (23 replies) — Discussion from long-time Z-330 user Andrej Oblak contemplating upgrades to circular-tube designs like the Retra Pro or OneUW, comparing beam quality, backscatter behavior, and color temperature. Includes contributions from Dave Hicks demonstrating excellent results achievable with Z-330 technique (^[83]).
• Slaying the Bastard Button - Inon 330 (16 replies) — Dave Hicks’ 3D-printed guard design to prevent accidental button presses, with design files shared on Thingiverse. Sparked broader discussion of 3D printing for underwater photography accessories (^[84]).
• INON Z330 (Typ2) (7 replies) — Thread discussing Z-330 availability after apparent discontinuation, with reports of the strobe disappearing from Inon’s website and confirmation of a successor in development (^[85]).
• Combining INON Z240 and Z330 strobes (8 replies) — Users discussing compatibility of mixing Z-240 and Z-330 strobes after Z-330 discontinuation made finding matched pairs difficult. Community consensus: same color temperature (5,500K) makes them compatible, though the power difference complicates balanced lighting (^[86]).
• Inon 330 light stays on (6 replies) — Troubleshooting thread for a known issue with the on/off switch mechanism. Inon offers factory rebuilds for approximately $350, replacing electronics and flash tubes — effectively a new strobe in the original housing (^[87]).
• We need a good inexpensive strobe (38 replies) — Broad market discussion placing the Z-330 in context with competitors from Retra ($1,025+), Sea & Sea ($799), Backscatter MF-2 ($400), and budget options. Debate on power needs for different sensor sizes (^[88]).
• Inon rumors: New Inon S-220 to replacement S-2000 (35 replies) — Community tracking photos of the S-220 successor, with Architeuthis reporting dealers expected the Z-330 replacement “at the earliest, in autumn” 2023. Phil Rudin predicted a “Z-450” naming convention (^[89]).
• RETRA Strobe Thread (707 replies) — The comprehensive Retra discussion thread includes frequent Z-330 comparisons from users who tested both (^[90]).

Context: The Z-240’s Legacy

The Z-240 was the dominant strobe for underwater photographers across most of the 2000s and 2010s. Announced in March 2006 with a GN of 24 and 320 full-flash dumps per charge (^[91]), its reliable fiber-optic triggering, balanced color temperature, and diffuser system made the default choice for beginners and professionals alike. Forum user makar0n captured the sentiment: “still rocking Z240s, those things are absolutely indestructible. Inon definitely lead the pack in terms of quality vs price” (^[92]). When Inon announced its discontinuation in June 2017, it prompted discussion about whether the Z-330 would maintain the ecosystem compatibility and reliability that had made the Z-240 ubiquitous (^[93]). The Z-330 accepted the same fiber-optic cables and battery compartment, easing the transition.

Inon’s Global Ambassador: Takuya Torii

The Z-330 era coincided with the prolific global travels of Inon’s Takuya Torii, who “perpetually circles the globe, supporting Inon dealers and attending workshops, shootouts, and shows” as Adam Hanlon described him. In January 2019, Torii visited the UK for an Inon UK event at the London School of Diving hosted by Steve Warren and Lisa Collins, followed by cold-water diving at Capernwray near Lancaster in 5°C water, before continuing to Italy and then BOOT in Dusseldorf. During this trip, Torii showed Adam Hanlon prototype Inon vacuum systems and TTL opto-electrical converters for Canon (^[94]). In January 2023, Torii returned for an Inon UK Open Day in Manchester with 40 attendees, where news about the Z-330 discontinuation and S-220 successor was shared (^[95]).

Related Products

• Inon D-200 — Inon’s mid-range strobe sharing the same dome lens technology, light shade system, and dome filter accessories. GN 20, optical-only triggering. Released September 2018 (^[96]). Described by Torii as “essentially a budget version of the Z330” (^[97]).
• Inon Z-240 — The predecessor strobe that the Z-330 replaced.
• Inon S-220 — Successor to the S-2000, shipping 2023, with GN 22 and interchangeable screw-on diffusers (^[98]).
• Retra Flash — The Z-330’s primary competitor at launch, using a circular flash tube design.

Timeline

• 2006-03: Inon announces the Z-240 flagship strobe with GN 24 (^[99])
• 2017-06-05: Inon ceases production of the Z-240 (^[100])
• 2017-11-25: Sneak preview of Z-330 published; pre-orders appear on French dealer site (^[101])
• 2017-12-15: Full specifications formally released by Inon (^[102])
• 2017-12-24: First Z-330 units ship (^[103])
• 2017-12-27: Cold shoe mounting bases (1/4-20UNC, M6, BALL) begin shipping (^[104])
• 2017-12-30: Phil Rudin shoots first published black water images with Z-330 (^[105])
• 2018-01: Adam Hanlon begins comparative testing with Z-240; Alex Mustard tests in Caribbean (^[106])
• 2018-02-08: Adam Hanlon begins Red Sea field testing at Emperor Divers, Port Ghalib, shooting Z-330 and Retra Flash side by side (^[107])
• 2018-02-19: Wetpixel publishes multi-part strobe comparison: Z-330, Retra Flash, Symbiosis SS2 (^[108])
• 2018-03-29: Warming dome filters (4600K, 4900K) ship (^[109])
• 2018-04-24: Retra announces LSD mounting kit for Z-330 (^[110])
• 2018-09-05: Inon announces the D-200, a mid-range strobe sharing Z-330 dome lens technology (^[111])
• 2018-12-19: Front Cover 110 neoprene dome protector ships (^[112])
• 2019-01-20: Inon UK workshop at London School of Diving with Takuya Torii; cold-water testing at Capernwray (^[113])
• 2019-01-29: Snoot Set for Z-330/D-200 ships (^[114])
• 2019-07-14: Quick Holder System ships for rapid strobe mounting/removal (^[115])
• 2020-02: Inon ships reflective stickers for Z-330/D-200 light shades (^[116])
• 2021-06-10: Z-330 Type 2 ships with fly-eye dome lens for improved light distribution (^[117])
• 2022-09-02: Inon announces S-2000 discontinuation with successor under development (^[118])
• 2022-12-21: Inon Corporation officially announces Z-330 Type 2 discontinuation; successor confirmed under development (^[119])
• 2023-01-21: Inon UK Open Day in Manchester with Takuya Torii confirms parts sourcing difficulties; S-220 successor expected within months (^[120])
• 2023-02: Dave Hicks publishes 3D-printed “Button Blocker” design to address bastard button issues (^[121])
• 2024-01: Inon’s Takuya Tori confirms Z-330 successor in development, no timeline given (^[122])

References

Wetpixel Live