Nikon Camera Coolpix L840 Reference Manual

Technical Notes
141
Images appear 
smeared.The lens is dirty. Clean the lens. 134
Colors are 
unnatural. White balance or hue is not adjusted properly. 25, 79
Randomly spaced 
bright pixels 
(“noise”) appear in 
image. The subject is dark and the shutter speed is too 
slow, or ISO sensitivity is too high. Noise can be 
reduced by:
•
Using the flash
• Specifying a lower ISO sensitivity setting 43
83
Images are too 
dark 
(underexposed). •
The flash is lowered or a shooting mode that 
restricts the flash...

Technical Notes
142Playback Issues
ProblemCause/SolutionA
File cannot be 
played back. •
This camera may not be able to play back images 
saved with another make or model of digital 
camera.
• This camera cannot play  back movies recorded 
with another make or mo del of digital camera.
• This camera may not be able to play back data 
edited on a computer. –
Cannot zoom in 
on image. •
Playback zoom cannot  be used with movies.
• When viewing small images, the playback zoom 
ratio that is displayed may...

Technical Notes
143
Images to be 
printed are not 
displayed.•
The memory card contains no images.
• Remove the memory card to print images in the 
internal memory. –
8
Cannot select 
paper size with 
the camera. The camera cannot be used 
to select the paper size 
in the following situations, even when printing from 
a PictBridge-compatible printer. Use the printer to 
select the paper size.
• The printer does not support the paper sizes 
specified by the camera.
• The printer automatically selects the...

Technical Notes
144
Images or movies are assigned file names as follows.
File name: DSCN
 0001 .JPG(1) (2) (3)
File Names
(1) IdentifierNot shown on the scre
en of the camera.
• DSCN: Original still images, movies, still images created by 
editing movies
• SSCN: Small picture copies
• RSCN: Cropped copies
• FSCN: Images created by an image editing function other 
than crop and small picture, movies created by the movie 
editing function
(2) File number Assigned in ascending order, st
arting with “0001”...

Technical Notes
145
* When using EN-MH2 rechargeable Ni-MH batteries with the camera, charge the 
batteries four at a time using Battery Charger MH-73. Also, do not charge batteries 
at the same time if they have different amounts of charge remaining ( A132). EN-
MH1 rechargeable Ni-MH ba tteries cannot be used.
Availability may vary with country or region.
See our website or brochures for the latest information.
Optional Accessories
Battery charger, 
rechargeable batteries*•
Battery Charger MH-73...

Technical Notes
146
Nikon COOLPIX L840 Digital Camera
Specifications
TypeCompact digital camera
Number of effective pixels16.0 million (Image processing may reduce the 
number of effective pixels.)
Image sensor1/2.3-in. type CMOS; approx. 16.76 million total pixels
Lens
NIKKOR lens with 38× optical zoom
Focal length 4.0–152 mm (angle of view equivalent to that of 
22.5–855 mm lens in 35mm [135] format)
f/-number
f/3–6.5
Construction12 elements in 9 groups (3 ED lens elements)
Digital zoom magnification...

Technical Notes
147
Image size
(pixels)•
16M (High) [4608 × 3456 P]
• 16M [4608 × 3456]
• 8M [3264 × 2448]
• 4M [2272 × 1704]
• 2M [1600 × 1200]
• VGA [640 × 480]
• 16:9 [4608 × 2592]
• 1:1 [3456 × 3456]
ISO sensitivity 
(Standard output 
sensitivity) •
ISO 125–1600
• ISO 3200, 6400 (available when using Auto 
mode)
Exposure
Metering mode Matrix, center-weighted (digit
al zoom less than 2×), 
spot (digital zoom 2× or more)
Exposure control Programmed auto exposure and exposure 
compensation 
(–2.0 – +2.0...

Technical Notes
148
Wi-Fi (Wireless LAN)
StandardsIEEE 802.11b/g/n (standard wireless LAN protocol)
Range (line of sight)Approx. 10 m (10 yd)
Operating frequency2412–2462 MHz (1-11 channels)
Data rates (actual 
measured values)IEEE 802.11b: 5 Mbps
IEEE 802.11g: 20 Mbps
IEEE 802.11n: 20 Mbps
Security
OPEN/WPA2
Access protocolsInfrastructure
Supported languages Arabic, Bengali, Bulgarian, Chinese (Simplified and 
Traditional), Czech, Danish, Dutch, English, Finnish, 
French, German, Greek, Hindi,...

Technical Notes
149
•Unless otherwise st ated, all figures assume fresh LR6/L40 (AA-size) alkaline 
batteries and an ambient temperature of  23 ±3°C (73.4 ±5.4°F) as specified 
by the Camera and Imaging Pr oducts Association (CIPA).
1Battery life may vary depending on conditio ns of use, such as the interval between 
shots or the length of time that menus and images are displayed. The included 
batteries are for trial use only. Figures li sted for lithium batteries are measured 
using commercially...

Technical Notes
150
Approved Memory Cards
The following Secure Digital (SD) memory cards have been tested and 
approved for use in this camera.
• Memory cards with an SD Speed Class rating of 6 or faster are 
recommended for recording movies. When using a memory card with a 
lower Speed Class rating, movie  recording may stop unexpectedly.
•Contact the manufacturer for details on  the above cards. We cannot guarantee 
camera performance when using memory cards made by other manufacturers.
• If you use a...