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Pentax Optio A30 - Test shots - ISO performance

By Cliff Smith


  • Recommended by TR
Pentax Optio A30


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A range of test shots are shown over the next few pages. Here, the full size image at the minimum ISO setting has been reduced for bandwidth purposes to let you see the full image, and a series of crops taken from original full resolution images at a range of ISO settings have been placed below it in order for you to gain an appreciation of the overall quality.



At the minimum ISO 64, picture quality is outstanding, with rich colours, tons of pin-sharp detail and no noise at all.


Likewise at 100 ISO picture quality is superb.


At 200 ISO there is a hint of chromatic noise in the darker areas, but detail and contrast are unaffected.


There is more colour speckling in this 400 ISO shot, but the lettering in the motto banner below the crest is still plainly readable.


Noise is starting to become a problem at 800 ISO, but the sharp edge detail and colour accuracy would still make a usable print.


At 1600 ISO, the highest manually selectable setting, image noise is now quite bad across the whole image, and fine detail has been completely lost.


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