Camera Rocket Review Our evaluation of D40 vs D3100

Image Quality

RAW image quality independent of lens

Nikon D40
8.8
D3100
9.9
DxOMark Low light, DxOMark Color depth and DxOMark Dynamic range

Focusing

How fast and easily does the camera nail focus

Nikon D40
6.4
D3100
6.5
Focus lag, cross type focus points and focus points

Responsiveness

How much delay is there between you and your photo?

Nikon D40
8.4
D3100
8.3
Focus lag, continuous shooting and Startup delay

Reviews

What do the experts think?

Nikon D40
9.1
D3100
9.2
Reviews from nikonrumors.com, techradar.com, dpreview.com and reviews.cnet.com

Camera Rocket Score

Image Quality, Focusing, Responsiveness and Reviews

Nikon D40
8.7
D3100
9.0

Winner
Nikon D3100 

Camera Rocket recommends the Nikon D3100  based on its image quality, focusing and reviews.

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Benchmarks Real world tests of Nikon D40 vs D3100

Low light image quality Highest ISO setting that still achieves great image quality

Nikon D40
561 ISO
D3100
919 ISO

Resolution Results from photos of standard resolution charts

Nikon D40
1,850 LPH
D3100
2,400 LPH

Focus lag Delay between fully pressing shutter to image capture

Nikon D40
260 ms
D3100
279 ms

Shutter lag Delay to take a photo when prefocused

Nikon D40
98 ms
D3100
117 ms

Startup delay Delay from power on to first photo

Nikon D40
400 ms
D3100
400 ms

Continuous shooting Delay between fully pressing shutter to image capture

Nikon D40
2.5 fps
D3100
3 fps

Features Key features of the Nikon D40  vs D3100 

Megapixels Maximum resolution images are captured at

Nikon D40
6 MP
D3100
14.2 MP

Max ISO Maximum light sensitivity of the sensor

Nikon D40
3,200 ISO
D3100
12,800 ISO

Focus points How many different points the camera can focus on

Screen size Larger screens make it easier to preview and review photos

Nikon D40
2.5"
D3100
3"

Viewfinder size Large viewfinders are brighter and more comfortable to use

Nikon D40
0.53x
D3100
0.51x

Pixel size How much area of the sensor is dedicated to each pixel

Nikon D40
61.1 microns
D3100
25.1 microns

Reviews Word on the street

Nikon D40  vs D3100 

7.5
7.4
The D40 also gets high marks for photo quality, with very low-noise images, minimal lens distortion, excellent metering and exposure, and pleasing colors.
Nikon D40

8.0
9.0
Even so, the LCD looks fairly accurate in terms of brightness, contrast and colour balance, and that's what is most important.
D3100

Overall

8.3 Out of 10
8.5 Out of 10

Specifications Full list of technical specs

sensor

Nikon D40  vs
D3100 
Type CCD CMOS
Megapixels 6 MP 14.2 MP
Resolution 3008 x 2000 4608 x 3072
Size APS-C APS-C
Area 23.7 x 15.5 mm 23.1 x 15.4 mm
Crop factor 1.5x 1.6x
Pixel size 61.1 microns 25.1 microns
Light sensitivity 200 ISO to 1,600 ISO 100 ISO to 3,200 ISO
Light sensitivity (Boost) 1,600 ISO to 3,200 ISO 3,200 ISO to 12,800 ISO
Codecs
RAW
JPEG
Self cleaning sensor No Yes
Tested vertical resolution 1,850 LPH 2,400 LPH
Tested horizontal resolution 1,700 LPH 2,400 LPH

focus system

Type Phase detection Phase detection
Focus points 3 11
Cross type focus points 1 1
Supports continuous No No

shutter

Min 30 s 30 s
Max 1/4000 s 1/4000 s

form factor

Size 124 x 94 x 64 mm 124.5 x 96.5 x 73.7 mm
Thickness 64 mm 73.7 mm
Weight 522 g 505 g
Is weather sealed No No

features

Is a smart camera No No
Includes a GPS No No
Supports HDR No No
Automatic panorama No No
Create realistic 3D images No No
Image stabilization

video

Nikon D40  vs
D3100 
Video None 1920 x 1080 @ 24 fps
Shoots video in 24p N/A Yes
Shoots high speed video N/A No
External mic jack N/A None
Autofocus while shooting video N/A Contrast detection
Autofocus type N/A Contrast detection

display

Type LCD LCD
Size 2.5" 3"
Resolution 230 k dots 230 k dots
Has a touch screen No No
Has a flip out screen No No
Supports live view No Yes

viewfinder

Viewfinder mirror Opaque Opaque
Viewfinder Yes Yes
Type Pentamirror Pentamirror
Coverage 95% 95%
Magnification 0.8x 0.8x
Viewfinder size 0.53x 0.51x

performance

Max continuous shooting 2.5 fps 3 fps
Battery life 470 550
Continuous shooting
3 fps, JPEG
2.5 fps, JPEG
Focus lag 260 ms 279 ms
Shutter lag 98 ms 117 ms
Startup delay 400 ms 400 ms
Nikon D40
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Nikon D3100
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