NEEWER NW645 TTL Camera Speed lite Instruction Manual
- June 5, 2024
- NEEWER
Table of Contents
NEEWER NW645 TTL Camera Speed lite Instruction Manual
Please read this user manual carefully before using the product. This manual can help you understand the product functions and precautions as well as installation steps.
Applications
Safety Note
Please do not trigger the flash directly into the eyes which may result in visual impairment.
Please do not disassemble or modify the circuit.
Package Contents
Please carefully check whether the contents of the package are complete and in good condition. If there are any missing or broken items, please contact Neewer Customer Service.
Functions
long press the Power Button ” ” for three second to turn the speedlite on/off.
Display
If “M” is display on screen it indicates the focal length requires manual
adjustment.
If not displayed, adjustment is automatic.
Reflection Direction Adjustment
The speedlite head can be tilted up by 90°and lowered by -7; it can be rotated horizontally by 90°to 180. By pointing the speedlite head toward a wall or ceiling, the flash will bounce off the surface before illuminating the subject. This can soften shadows behind the subject for a more natural-looking shot.
Mode Function
TTL Flash Mode A test mode in which the flash output is determined by the actual amount of light passing through the camera lens.
Short press “M” button until “TIC mode is displayed. Short press “Direction Key” to adjust exposure compensation.
M Manual Flash Mode The flash output index can be set as needed and the flash output is adjustable from 1/128 power to 1/1th full power in 113th stop increments.
Short press “M” button until “M” mode is displayed, then short press “Direction Key” to adjust exposure compensation.
Multi Stroboscopic Flash Mode
The strobe flash allows you to fire a rapid series of flashes. You can set the flash frequency, the number of the flashes and the flash output.
Short press “M” button until “Multi” mode is displayed, then short press “SET” button until the display blinks. Short press “C’ or “)” to adjust the settings.
Please do not use stroboscopic flash more than 10 times in succession. After triggering ten times, please allow the speedlite to rest for at least 15 minutes.
Relations between flash power, flash frequency and the number of flashes when using stroboscopic flash.
| Hz | 1 | 2 | 3 | 4 | 5 | 6-7 | 8-9 | 10 | 11 | 12-14 | 15-19 | 20-50 | 60-199 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Flash Output | |||||||||||||
| 1/4 | 7 | 6 | 5 | 4 | 4 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 2 |
| 1/8 | 14 | 14 | 12 | 10 | 8 | 6 | 5 | 4 | 4 | 4 | 4 | 4 | 4 |
| 1/16 | 30 | 30 | 30 | 20 | 20 | 20 | 10 | 8 | 8 | 8 | 8 | 8 | 8 |
| 1/32 | 60 | 60 | 60 | 50 | 50 | 40 | 30 | 20 | 20 | 20 | 18 | 16 | 12 |
| 1/64 | 90 | 90 | 90 | 80 | 80 | 70 | 60 | 50 | 40 | 40 | 35 | 30 | 20 |
| 1/128 | 100 | 100 | 100 | 100 | 100 | 90 | 80 | 70 | 70 | 60 | 50 | 40 | 40 |
Optical Wireless Transmission(slave mode) Short press “M” button until ” ” Optical Command Flash Triggering is displayed.
Channel
Short press “SET” button until “CH1” blinks on the display, and then short
press “t or “r to adjust channel.
Group
Short press “SET” button until ” fl ” blinks on the display, and then short
press “(11 or “)” to adjust group.
NW645-C/N/S slave flash is compatible with Canon/Nikon/SONY original optical master flashes (The flash can be triggered when the channel is matched up within the groups.)
S1 Optical Control Mode
In S1 mode, the flash unit can function as an optical S1 secondary flash which
helps create multiple lighting effects. This applies to a manual flash
environment.
In M manual flash mode, short press “M” button until “Si” mode is displayed, then short press “Direction Key” to adjust exposure compensation.
S2 Optical Control Mode
In S2 mode, the flash unit can function as an optical S2 secondary flash which
will ignore the pre-fresh given by a TTL flash. This allows it to support the
main flash operating in TTL mode.
In M manual flash mode, short press “M” button until “S2” mode is displayed, then short press “Direction Key” to adjust exposure compensation.
High-speed Sync
The High-speed Sync is an effective function when you want to use aperture
priority for fill-flash portraits. Long press “M” button or set to high-speed
sync in camera menu. The display will show corresponding icon ” “.
Note: NW645-C: High-speed sync mode(secondary-curtain sync) is enabled on both camera and flash. NW645-S: High-speed sync mode(secondary-curtain sync) is enabled only on flash. NW645-N: High-speed sync mode(secondary-curtain sync) is enabled only when it is on camera.
First-curtain Mode
TTL mode can be divided into first-curtain mode and second-curtain mode.
First-curtain mode is set by default.
second-curtain Mode
Long press “M” button in TTL mode or set to high-speed sync mode in camera
menu. The display will show corresponding icon ” “.
NW645-C can be set to secondary -curtain sync on both camera and flash. The
icon will display “ “.
NW645-N can be set to secondary curtain sync only on camera. The icon will
display “ ”
NW645-S can be set to secondary curtain sync only on camera. The icon will not
display “ “.
Buzz function
Long press “SET” button for two seconds, to activate the buzz function. Press
again for two seconds to deactivate.
Test Button
When ” ” button turns red, it indicates the speedlite is ready to fire. Press
this button to fire the test flash. (If the button shows pale yellow, the
flash is not ready to fire. )
Installation and Use
Shooting with a diffuser
Using a diffuser can increase the flash’s diffusion range, make the light
softer and reduce the shadow.
Mounting the diffuser on the speedlite head.
Use the flash to achieve the desired effect by adjusting the speedlite to the
right position.
Shooting with a Built-in Wide-angle Diffuser Panel When the distance between the camera and the subject is less than approximately two centimeters , a wide-angel diffuser panel can be used to take a more natural close-up.
Tilt the speedlite head up by 45°and pull out the wide-angle diffuser panel
and the reflection panel.
Push the reflection panel back in and keep the wide-angle diffuser panel out.
When usingthewide-angle diffuser panel, the focus length of the speedlite should be set to the minimum.
AA Battery Installation
Slide the battery compartment cover in the same direction as arrow and open it
by thumb.
Remove four M batteries from their packaging.
Insert the batteries correctly inside the compartment respecting the correct
polarity positions.
Slide the battery cover back in place. The battery cover will be locked when
there is an audible click.
Mounting the speedlite on the camera
Rotate the locking ring in the direction of the arrow to the highest point.
Slide the speedlite into the camera’s hot shoe fully.
Twist the locking ring clockwise to tighten it.
To remove the speedlite, loosen the locking rings to the top, then remove the
speedlite from the hot shoe of camera.
Safety Notes
- Please do not use the flash within close proximity of flammable gases, chemicals(such as gasoline, solution, etc. ) and other similar potentially explosive materials.
- Please avoid trigger the flash directly at moving traffic to avoid causing an accident.
- Please do not fire the flash directly into the eyes within short distances. This could lead to visual impairment or, in severe cases, blindness.
- Please do not charge a dry cell battery.
- Please do not use speedlite in rain or damp environment.
- Please do not use any defective batteries in this speedlite which may result in a malfunction.
- Remove the battery when device is not to be used for an extended period.
- If the speedlite does not operate as it should, please follow these steps. Switch off the power of speedlite and camera, mount the speedlite on the hot shoe of camera and switch on the power of speedlite and camera again. If abnormal operation continues, replace the batteries.
- If the device operates abnormally, or a partial function failure occurs during use, please replace with new AA batteries or check whether the locking mount is loose
- When not using the speedlite, please ensure to power off both speedlite and camera before removing the speedlite. Do not remove with excessive force.
- The flash will power off automatically after approx. 30 minutes of inactivity. Please restart the flash to continue using.
Product Parameters
| Model | NW645-C | NW645-N | NW645-S |
|---|---|---|---|
| Controllable Slave Groups | 3 Groups:ABC | 3 Groups:ABC | 2Groups: |
A (RMT),B(TMT2)
Guide Number| GN 58 (M IOS 100, 180mm)
Flash Cover Range| 24-180mm Manual Zoom, Auto Zoom, tilting speedlite head
(bounce flash)
Light Body AdjustmentAngle| Swinging/tilting flash head(bounce flash):, -90°to
180° horizontally, -7 °to 90° vertically
Flash Duration| 1/300 second-1/20000 second
Sync Triggering Mode| Hot shoe, S1/S2, Optical command
Color Temperature| 5600±200K
Flash Exposure Compensation| Manual, FEB: ±3 stops in 1/3 stop increments
(Manual FEC can becombined.)
External Interface| Hot shoe, PC Sync Port, External Charging Port
Recycle Time| 0.1-‘3.5S
Sync Method| First-curtain Sync, Second-curtain Sync,
High-speed Sync(up to 1/8000 second)
Flash Mode| TTL, M, Multi
Wireless Flash Triggering Distance| Indoor 20-30 meters, Outdoor 10-15 meters
AA Type Battery| Ni-MH batteries(recommended ) or LR6 type alkaline batteries
4
Full Power Flash Times| approx. 230 times( 2500mA Ni-MH batteries)
Dimensions| 20376*61mm
Net Weight
(battery not included)| 4008
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