Canon IXUS 155 Review

July 18, 2014 | Matt Grayson |

Image Quality

All of the sample images in this review were taken using the 20 megapixel Superfine JPEG setting, which gives an average image size of around 6Mb.


Noise results from the low ISO looks promising at ISO 100. There's isn't an iota of noise in shadows or dark areas, but there is plenty of detail and nice, sharp edges. Being hyper-critical, slight amounts of noise start to poke through at ISO 200 and that's disappointing. ISO 400 is where the big changes happen though. There's a massive drop in image quality in terms of detail showing and noise coming through. Green blotches appear in darker areas and detail is already being smudged out by noise reduction software.

ISO 800 sees a drop in colour in order to subdue colour noise, but it still persists in occupying much of the image. Salt & pepper noise is also starting to intimidate mid-tones a lot more. This must be why they've capped the ISO ratings to ISO 1600. Any higher and the images would be unrecognisable and that's not good for a brand with such a high reputation.

The examination above was done at full magnification and if you look at the pictures at normal viewing size, you shouldn't see noise come through until ISO 800 except on long exposures where heated pixels will disrupt the performance of neighbouring pixels.

ISO 100 (100% Crop)

ISO 200 (100% Crop)

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ISO 400 (100% Crop)

ISO 800 (100% Crop)

iso400.jpg iso800.jpg

ISO 1600 (100% Crop)



Adding sharpening to the pictures certainly helps if the pictures are at a low ISO and there's no evident noise. If there is, the sharpening process simply exacerbates it.

Original (100% Crop)

Sharpened (100% Crop)

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sharpen2.jpg sharpen2a.jpg

Focal Range

The Canon IXUS 155's 10x zoom lens provides a focal length of 24-240mm in 35mm terms, as demonstrated below.



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Chromatic Aberrations

We found traces of chromatic aberration all over the pictures. Generally on high contrast edges, but not exclusively and they don't have to be sharp edges either. We did notice that due to the limited dynamic range of the sensor, some light bleed from bright skies looked like chroma, so don't mistake that.

Chromatic Aberrations 1 (100% Crop)

Chromatic Aberrations 2 (100% Crop)

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Chromatic Aberrations 3 (100% Crop)

Chromatic Aberrations 4 (100% Crop)

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The IXUS 155 has a 1cm close focus system. That's so close, it invades your personal space. The sweet spot in the centre can produce incredibly sharp images, but the drop off if image quality towards the edges comes in quickly and very severely.


Macro (100% Crop)

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Without flash, the pictures are balanced with no evidence of vignetting that we could detect. Adding flash adds a harsh vignette at wide-angle though, but this goes as you get to the full zoom.

Flash Off - Wide Angle (24mm)

Flash On - Wide Angle (24mm)

ISO 64 ISO 64

Flash Off - Telephoto (240mm)

Flash On - Telephoto (240mm)

ISO 64 ISO 64

We did get some red-eye when taking portraits. Using the red-eye correction function does reduce it, but a correction system suggests it removes it. However, it does this digitally, so will be programmed to look for certain colours and it's quite possible that this was outside of the gamut.

Flash On

Flash On (100% Crop)
flash_on.jpg flash_on1.jpg

Red-eye Correction

Red-eye Correction (100% Crop)

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You can take pictures in Program mode at night which allows you to control the ISO and in turn allows smoother images. However, the maximum exposure time is 1sec which, in very dark conditions, simply isn't enough. The Night mode of the IXUS 155 is much better than those found on some other compact cameras. It's in fact a Long Exposure mode that allows you to select how long you want the exposure to be. You can choose anything up to 15 seconds and the camera will blessedly also allow you to adjust the ISO and white-balance.

Night Program

Night Program (100% Crop)

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Night Scene

Night Scene (100% Crop)

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