Neewer NW645II-N TTL Flash Speedlite for Nikon — main product image

Neewer NW645II-N TTL Flash Speedlite for Nikon

Neewer

Neewer NW645II-N TTL Flash Speedlite for Nikon

Name: Neewer NW645II-N TTL Flash Speedlite for Nikon
Brand: Neewer
SKU: NW645II-N

★★★★★4.3 (76 reviews)

Versatile TTL flash for Nikon with high-speed sync up to 1/8000s, GN58 power, and fast 0.1s recycle time.

$59.99*$70.99Save 15%

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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-N is a full-featured TTL speedlite designed for Nikon DSLR and mirrorless cameras. It pairs automatic through-the-lens metering with a guide number of GN58 at ISO 100, delivering enough power to light subjects at considerable distances while letting the camera handle exposure calculations. High-speed sync up to 1/8000s opens up creative possibilities for wide-aperture portraits in daylight, and rear curtain sync captures dynamic motion trails with a sharp flash-frozen endpoint. Flash output is adjustable in precise 1/3-stop increments from full power down to 1/128, and the stroboscopic mode enables multi-burst sequences for motion study or creative effects.

Build quality includes a clear LCD panel for at-a-glance settings review, along with a bounce head that tilts from -7° to 90° and rotates a full 270° for indirect lighting off ceilings and walls. The included diffuser and bounce reflector card help soften and shape output further. Recycle times range from 0.1 seconds at low power to 3.5 seconds at full output, with an SD-9 external battery port available for faster recycling during high-volume shoots. Optical slave modes S1 and S2 allow the flash to serve as an off-camera unit triggered by another flash, giving photographers a path into multi-light setups without additional radio triggers. Weighing 1.28 pounds with dimensions of 2.4 × 3 × 8 inches, it fits standard hot shoe mounts across a wide range of Nikon bodies from the D60 through the Z9.

Key Features

【Upgraded Multifunctional Speedlite】 NW645II-N 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 transitory moment. An SD-9 external charging port is available to speed up the recycling. Stable 5600K±200K daylight delivers a consistent color temperature to all shots

【Rear Curtain Flash Sync】 NW645II-N supports rear curtain sync in which flashes burst at the end of exposure and freeze movements in the meantime. With this useful feature at hand, you can easily achieve a well illuminated photoshoot with smooth, expressive motion trails

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

【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 with Nikon D4 D5 D6 D60 D70S D90 D100 D200 D300 D610 D700 D750 D780 D800 D810 D850 D3100 D3200 D3300 D3400 D3500 D5000 D5100 D5200 D5300 D7100 D7500 Z9 Zfc Z50 Z5 Z6 Z7 Z6II Z7II cameras

Specifications

Guide Number

GN58 (ISO 100, meters)

Flash Modes

TTL, HSS, Optical Slave (S1/S2), Stroboscopic, Rear Curtain Sync

High-Speed Sync

Up to 1/8000s

Flash Output Range

1/1 to 1/128 (1/3-stop increments)

Recycle Time

0.1–3.5 seconds

Flash Duration

1/300–1/20000s

Color Temperature

5600K ± 200K

Bounce Head Tilt

-7° to 90°

Bounce Head Rotation

270°

External Power Port

SD-9 compatible

Dimensions

2.4 × 3 × 8 inches

Weight

1.28 lbs

Compatibility

Nikon D4, D5, D6, D60, D70S, D90, D100, D200, D300, D610, D700, D750, D780, D800, D810, D850, D3100, D3200, D3300, D3400, D3500, D5000, D5100, D5200, D5300, D7100, D7500, Z9, Zfc, Z50, Z5, Z6, Z7, Z6II, Z7II

Pros & Cons

👍 Pros

High guide number of GN58 provides strong output for lighting subjects at greater distances
Fast minimum recycle time of 0.1 seconds keeps up with rapid shooting
HSS up to 1/8000s enables wide-aperture flash photography in bright conditions
Flexible bounce head with -7° to 90° tilt and 270° rotation for versatile light shaping
Broad Nikon compatibility spanning both DSLR and Z-mount mirrorless bodies

👎 Cons

No built-in radio wireless receiver, relying on optical slave triggering which requires line of sight
External battery pack for faster recycling is sold separately
At 1.28 pounds it adds noticeable weight and bulk to smaller Nikon bodies like the Z50 or Zfc
Color temperature consistency of 5600K±200K may show slight variation across a multi-flash setup

Frequently Asked Questions

Does the NW645II-N support TTL metering automatically on compatible Nikon cameras?

Yes, when mounted on a compatible Nikon hot shoe, the flash communicates with the camera's metering system to automatically calculate and adjust flash output for proper exposure.

Can this flash be used off-camera as a slave unit?

Yes, it supports optical slave modes S1 and S2. In S1 mode it fires with any manual flash trigger, and in S2 mode it ignores TTL pre-flashes and fires on the main burst, making it compatible with TTL master units.

What is the recycle time, and can it be improved?

Recycle time ranges from 0.1 to 3.5 seconds depending on power output. An SD-9 external battery pack port is included to speed up recycling during demanding shoots.

How far can the flash head tilt and rotate for bounce lighting?

The head tilts from -7° to 90° vertically and rotates 270° horizontally, giving you wide flexibility to bounce light off ceilings, walls, or reflectors.

Is this flash compatible with Nikon Z-mount mirrorless cameras?

Yes, it is compatible with several Nikon Z-mount bodies including the Z5, Z6, Z7, Z6II, Z7II, Z50, Zfc, and Z9.