Support Cameralabs by shopping at my partner stores or buying me a coffee!
Buy me a coffee!

Follow my RSS feed at Camera Labs RSS Feed
  Latest camera reviews

Lumix G80 / G85
Olympus OMD EM1 II
Sony RX10 Mark III
Sony RX100 Mark V
Nikon COOLPIX B700
Sony A6500
Lumix FZ2000 / FZ2500
Nikon COOLPIX B500
Lumix LX10 / LX15
Fujifilm XT2
Nikon D3400
Canon EOS 5D Mark IV
Ricoh GR II
Canon G7X Mark II
Canon SX720 HS
Canon EOS 80D
Olympus TG Tracker
Nikon D500 review
Canon EOS 1300D / T6
Lumix GX80 / GX85
Fujifilm X-Pro2
Fujifilm X70
Lumix TZ80 ZS60
Sony A6300
Canon PowerShot G5X
Lumix TZ100 ZS100
Sony A7s Mark II
Sony RX10 II
Lumix FZ330 / FZ300
Sony RX100 IV
Canon G9X
Fujifilm XT10
Nikon COOLPIX L840
Canon SX530 HS
Olympus OMD EM10 II
Canon SX410 IS
Panasonic Lumix GX8
Olympus TOUGH TG860
Sony A7r Mark II
Canon PowerShot D30
Olympus TOUGH TG4
Canon PowerShot G3X
Canon EOS 5Ds
Nikon COOLPIX S9900
Sony HX90V
Canon EOS T6s 760D
Panasonic Lumix G7
Panasonic Lumix SZ8
Canon EOS M3
Olympus EPL7
Samsung NX3000
Panasonic Lumix GM5
Nikon D5500
Panasonic Lumix GF7
Olympus OMD EM5 II
Nikon COOLPIX S9700
Canon SX710 HS
Panasonic TZ70 / ZS50
Sony Alpha A7 Mark II
Canon EOS 7D Mark II
Fujifilm X100T
Nikon COOLPIX S3600
Sony Alpha A5100
Sigma DP1 Quattro
Sony Cyber-shot W830
Nikon COOLPIX L830
Nikon D750
Canon SX400 IS
Sony Cyber-shot H400
Panasonic Lumix LX100
Canon SX60 HS
Canon ELPH 340 IXUS 265
Canon G7X
Nikon COOLPIX P530
Canon SX520 HS
Canon G1 X Mark II
Panasonic Lumix FZ1000
Panasonic TZ60 / ZS40
Sony RX100 III review
Sony A3000 review
Canon EOS 1200D T5
Sony WX350
Nikon P600
Sony Alpha A5000
Sony Cyber-shot HX400V
Panasonic Lumix GH4
Panasonic TS5 FT5
Sony Alpha A6000
Canon SX700 HS
Canon SX600 HS
Olympus TOUGH TG2
Nikon AW1
Nikon D3300
Fujifilm XT1
Olympus STYLUS 1
Sony Cyber-shot RX10
Olympus OMD EM1
Panasonic Lumix GM1
Nikon D610
Sony Alpha A7
Nikon D5300
Canon PowerShot A2500
Sony Alpha A7r
Canon ELPH 130 IXUS 140
Nikon COOLPIX P520
Nikon COOLPIX L820
Canon PowerShot S120
Panasonic Lumix GX7
Canon SX510 HS
Canon PowerShot G16
Fujifilm X20
Panasonic FZ70 / FZ72
Canon EOS 70D
Sony RX100 II
Canon ELPH 330 IXUS 255
Panasonic Lumix GF6
Fujifilm XM1
Olympus EP5
Panasonic Lumix LF1
Panasonic TZ35 / ZS25
Olympus XZ2
Sony HX300
Panasonic Lumix G6
Sony HX50V
Fujifilm X100S
Canon SX280 HS
Canon EOS SL1 / 100D
Panasonic TZ40 / ZS30
Nikon D7100
Fujifilm X-E1
Canon EOS 6D
Nikon D5200
Panasonic Lumix GH3
Canon PowerShot S110
Panasonic Lumix G5
Sony NEX-6
Panasonic Lumix FZ200
Canon PowerShot SX50 HS
Nikon COOLPIX P7700
Olympus E-PL5
Canon EOS M
Panasonic TS20 / FT20
Canon PowerShot G15
Nikon D600
Nikon COOLPIX L810
Canon PowerShot D20
Sony RX100
Panasonic Lumix LX7
Canon SX500 IS
Fujifilm HS30 EXR
Sony HX200V
Panasonic FZ60 / FZ62
Canon 520HS / 500HS
Canon 110HS / 125HS
Nikon D800
Canon EOS T4i / 650D
Canon PowerShot A3400
Panasonic ZS15 / TZ25
Olympus E-M5
Nikon D3200
Fujifilm X-Pro1
Canon PowerShot A2300
Canon SX240 / SX260
Samsung NX200
Sony Alpha SLT-A77
Canon EOS 5D Mark III
Panasonic ZS20 / TZ30
Canon PowerShot G1 X
Sony NEX-7
Panasonic GX1
Olympus E-PM1
Nikon V1
Sony NEX-5N
Canon EOS T3 / 1100D
Canon EOS 600D / T3i
Nikon D7000
Canon EOS 60D
Canon EOS 550D / T2i
Canon EOS 7D

All camera reviews
  Best Buys: our top models
  Best Canon lens
Best Nikon lens
Best Sony lens
Best budget DSLR
Best mid-range DSLR
Best semi-pro DSLR
Best point and shoot
Best superzoom
Best camera accessories

Camera Labs Forum

Any questions, comments or a great tip to share? Join my Camera forum and let everyone know!
  DSLR Tips

Canon PowerShot G7 Gordon Laing, February 2007

Outdoor / Resolution / Noise / Noise 2 / Corner sharpness / Fringe & macro / Geometry / Vignetting

Canon PowerShot G7 vs Canon EOS 400D / Rebel XTi real-life noise


To compare noise levels under real-life conditions we shot this scene with the Canon PowerShot G7 and Canon EOS 400D / XTi within a few moments using each of their ISO settings. The EOS 400D / XTi was fitted with the 18-55mm kit lens.

The PowerShot G7 image was shot in its native 4:3 aspect ratio, and the zoom of the EOS 400D / XTi adjusted to deliver the same vertical coverage. Note the G7's 3200 ISO mode is a scene preset with no manual control over aperture and shutter settings. It also operates at a greatly reduced resolution of 2 megapixels.

The image above was taken with the Canon PowerShot G7 at 9mm f4 and at 80 ISO; the original measured 4.78MB. The crops are taken from an area just below and to the left of the centre.

It's immediately clear from the results below the kind of differences you can expect between a compact and a DSLR when it comes to noise performance - especially at higher ISOs. The DSLR with its physically larger sensor is simply much more sensitive to light, and thereby requires less signal amplification, which in turn means lower noise. To be fair, this isn't a surprise and indeed many enthusiasts may consider our comparison a little unfair, but the G-Series are pitched as high-end compacts which in the past have been considered by many as pocketable budget alternatives to a DSLR. And since both the PowerShot G7 and EOS 400D / XTi share the same 10 Megapixel resolution, we wanted to illustrate the differences in practice.

With those caveats out the way, the PowerShot G7 delivers low noise images packed with detail at its lowest sensitivities, but you don't need to increase the ISO very far before speckles begin to appear. If you look closely enough they're actually present in some shadow areas at 100 ISO, but only begin to be visible in the crops below at 200 ISO. At 400 ISO, the speckles are much more obvious, while at 800 ISO they've become quite detrimental to image quality. 1600 ISO is really only for emergency use, and we're not sure who'll use the 3200 ISO scene preset once they've checked the results. Technically speaking, the 3200 ISO preset operates at just 2 Megapixels, so we've had to scale-up the crop in Photoshop for comparison here.

In contrast, the EOS 400D / XTi remains comparatively noise-free, with only a modest degradation at the highest sensitivities. This is the big difference between a compact and a DSLR, and if you want low noise at high sensitivities without compromising noise reduction, you simply have to go for a DSLR.

Once again though, a DSLR will always thrash a compact in this test, so in the spirit of fairness, open our real-life noise results pages for the Canon PowerShot A640 and Panasonic Lumix DMC-FZ50 for comparisons from cameras sporting similarly-sized sensors. These results may have been taken on different days and with slightly different framings, but illustrate how each camera handles noise in real life conditions. Interestingly the A640 appears to apply slightly less noise reduction than the G7, which may result in more speckles, but retains slightly greater detail. The Panasonic FZ50 illustrates a very heavy-handed approach to noise reduction, smearing detail at all but the lowest sensitivities.

Ultimately in terms of noise the PowerShot G7 performs similarly to the better 10 Megapixel compacts on the market. There's certainly worse offenders out there, but just don't expect miracles at 400 ISO and above. For more real-life examples across its sensitivity range, check out our Canon PowerShot G7 Gallery.

Canon PowerShot G7
Canon EOS 400D / Rebel XTi
80 ISO, 1/100, f4
80 ISO unavailable
100 ISO, 1/160, f4
100 ISO, 1/40, f8
200 ISO, 1/320, f4
200 ISO, 1/80, f8
400 ISO, 1/640, f4
400 ISO, 1/160, f8
800 ISO, 1/1250, f4
800 ISO, 1/320, f8
1600 ISO, 1/2500, f4
1600 ISO, 1/640, f8
3200 ISO, 1/2000, f6.3 (interpolated from 2 mpixel)
3200 ISO unavailable

Canon PowerShot G7 results continued...

Outdoor / Resolution / Noise / Noise 2 / Corner sharpness / Fringe & macro / Geometry / Vignetting
If you found this review useful, please support us by shopping below!
All words, images, videos and layout, copyright 2005-2017 Gordon Laing. May not be used without permission.

/ Best Cameras / Camera reviews / Supporting Camera Labs