Neewer NW645II-C TTL Flash Speedlite Canon Camera — main product image

Neewer NW645II-C TTL Flash Speedlite Canon Camera

Neewer

Neewer NW645II-C TTL Flash Speedlite Canon Camera

Name: Neewer NW645II-C TTL Flash Speedlite Canon Camera
Brand: Neewer
SKU: NW645II-C

★★★★★4.4 (167 reviews)

GN58 output and 1/8000s HSS give Canon shooters a capable one-flash solution for both controlled studio bounces and blown-highlight-free outdoor portraits.

$59.99*$63.00Save 4%

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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

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Overview

The Neewer NW645II-C is a full-featured TTL speedlite built specifically for the Canon E-TTL II system, covering a broad range of EOS R-series mirrorless and DSLR bodies. Its GN58 guide number (ISO 100, meters) positions it at the upper end of the consumer speedlite bracket — sufficient for bounced ambient-fill in rooms with 8–10 foot ceilings and for direct outdoor fill at moderate subject distances. High-speed sync to 1/8000s is the headline capability: it unlocks the ability to use flash at any shutter speed, giving portrait photographers the freedom to shoot at f/1.4 or f/1.8 in full sun without being forced into ND filtration or a narrow aperture. Flash duration ranging from 1/300s to 1/20000s also means the NW645II-C is capable of arresting moderate motion when used at high power fractions — relevant for product and macro work. The 5600K color temperature output matches standard daylight and is consistent across power levels, integrating cleanly with ambient daylight or continuous LED sources balanced to the same point.

The flash head articulates through -7° to 90° vertical and 270° horizontal rotation, covering every practical bounce geometry — ceiling, wall, floor, and reverse overhead — without requiring the camera to be repositioned. A bundled diffuser dome and reflector card expand the effective source size for softer shadow transitions. The optical slave implementation (S1 and S2) is genuinely useful for simple multi-flash setups on a budget, though its range and reliability diminish in bright outdoor ambient light. Power source is 4× AA batteries in the grip compartment; for sustained HSS or stroboscopic work, Eneloop Pro or equivalent high-drain NiMH cells are strongly recommended over alkaline. The LCD control panel is legible and organizes all shooting mode parameters clearly without requiring menu diving mid-shoot.

Key Features

【Upgraded Multifunctional Speedlite】 NW645II-C Speedlite supports TTL, HSS (high speed sync) up to 1/8000s, optical slave mode, stroboscopic flashes, rear curtain sync, and other features. A high guide number (GN58, ISO100m) allows lighting from a longer distance. A clear LCD screen displays all the information you need for precise settings

【Premium Flash Output】 Flash output is adjustable from 1 to 1/128 in 1/3 increments according to the actual ambient light. 0.1–3.5s short recycle time and 1/300-1/20000s flash duration let you capture every moment. Stable 5600K daylight delivers a consistent color temperature to all shots

【Optical Slave Control 】 NW645II-C is compatible with original master flash units and can be activated by them when set on the same channel. It also supports S1 & S2 modes, where it can be triggered when the master units are in the manual mode and TTL mode

【Flexible Bounce Angles】 Flash head can swivel up and down between -7° and 90° and rotate 270° to bounce the light off a wall and help you get natural photographs with fewer shadows. The diffusers and reflector create a broad and diffused output with less harsh shadows

【Compatible Models】 Compatible with Canon EOS R6 R5 R3 R M6 850D 800D/T7i 760D/T6s 750D/T6i 650D 600D 7D Mark II 7D 6D Mark II 6D 5D Mark IV/III/II 1D Mark III 1DX 550D 500D 450D 90D 80D 70D 60D 50D 1100D 77D SL3/250D T7/1500D 2000D T100/3000D 4000D(NOT compatible with RP R50)

Specifications

Guide Number

GN58 (ISO 100, meters)

TTL System

Canon E-TTL II

High-Speed Sync

Up to 1/8000s

Flash Duration

1/300s – 1/20000s

Color Temperature

5600K

Recycle Time

0.1 – 3.5 seconds

Output Range

1/1 – 1/128 (1/3-stop increments)

Bounce Tilt

-7° to 90°

Bounce Rotation

270°

Slave Modes

S1, S2, Optical TTL

Power Source

4 × AA batteries (not included)

Compatibility

Canon EOS R, R3, R5, R6, M6, 850D, 800D/T7i, 760D, 750D, 650D, 600D, 7D MkII, 7D, 6D MkII, 6D, 5D MkIV/III/II, 1D MkIII, 1DX, 550D, 500D, 450D, 90D, 80D, 70D, 60D, 50D, 1100D, 77D, SL3/250D, T7/1500D, 2000D, T100/3000D, 4000D (NOT RP, R50)

Pros & Cons

👍 Pros

GN58 output is competitive for a shoe-mount flash, providing adequate power for bounced ceilings in large rooms and outdoor fill at moderate working distances.
HSS up to 1/8000s enables wide-aperture ambient-light control in full sun — the technical prerequisite for outdoor fill-flash and environmental portrait work.
270-degree rotation and -7° to 90° vertical tilt gives a full range of bounce angles including floor bounce and horizontal wall bounce without repositioning the camera.
0.1-second minimum recycle time at reduced power allows near-continuous firing for event and documentary work when output is dialed back.
Optical slave S1/S2 modes allow use as an off-camera fill without a radio trigger, triggered by another flash on the same set.

👎 Cons

Not compatible with Canon RP and R50 bodies — a meaningful gap given the R50's popularity as an entry mirrorless body in the Canon ecosystem.
At full power, the 3.5-second recycle time is slow by professional standards, requiring patience or battery upgrade for sustained full-power shooting.
AA battery power (4× AA required, not included) means runtime depends entirely on battery quality — alkaline cells degrade quickly under sustained HSS use; rechargeable NiMH is effectively mandatory for serious use.
No built-in radio receiver — wireless triggering beyond optical slave requires a separate receiver unit, adding cost and a hotshoe occupancy conflict on the flash itself.

Frequently Asked Questions

Does the NW645II-C communicate full TTL metering with Canon mirrorless cameras, or only DSLRs?

TTL communication is confirmed for Canon EOS R-series mirrorless bodies including the R, R3, R5, and R6, as well as the full range of listed Canon DSLRs. Note that the Canon RP and R50 are explicitly excluded from the compatibility list — TTL will not function correctly on those bodies. For all supported bodies, the flash reads the camera's pre-flash metering data and sets output automatically.

What does HSS at 1/8000s enable that a standard sync speed does not?

Standard flash sync speed on most Canon bodies sits between 1/160s and 1/250s. Above that, only part of the sensor is exposed at any instant due to the traveling shutter curtain, causing a dark band across the frame. HSS at up to 1/8000s resolves this by pulsing the flash rapidly across the entire exposure duration, allowing you to shoot wide open (f/1.4–f/2.8) in bright ambient light while still adding flash fill — the fundamental technique for outdoor fill-flash portrait work.

What is the practical working distance at GN58?

Guide Number 58 (ISO 100, meters) means at ISO 100 and f/8, the flash reaches approximately 7.25 meters. In practice, with a modifier or bounced off a ceiling, effective range shortens considerably. At ISO 400 and f/2.8 — typical for event work — the GN58 output gives you meaningful working distances of 10–15 meters in a direct flash configuration.

How does the recycle time affect shooting in burst sequences?

At full power, recycle time runs up to 3.5 seconds — full-power bursts will see the flash simply not fire if the shutter is cycled faster than that. At partial power (1/4 to 1/16), recycle time drops substantially toward the 0.1-second lower bound, enabling rapid sequential shots. For event work with moving subjects, running at 1/4 to 1/8 power with ISO compensation is standard practice to maintain burst compatibility.

Can this flash be triggered wirelessly without a dedicated commander unit?

Yes, via optical slave. In S1 mode, the NW645II-C fires when it detects any flash burst from a master unit set to manual. In S2 mode, it fires on the second burst — suppressing the TTL pre-flash from an on-camera commander so the exposure is not affected by the pre-flash. It also receives optical TTL commands when triggered by a compatible Canon master flash unit on the same channel.