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Pentax *ist DS - Digital SLR - Test Shots - Full Res Crops
A range of test shots are shown over the next two pages. Here, the full resolution image has been reduced in size for bandwidth purposes, and a crop (taken from the original full resolution image at Adobe ImageReady jpg quality 60) follows each image in order for you to gain an appreciation of the overall quality. The next page consists of resized images (to Adobe ImageReady jpg quality 50) so that you can evaluate the overall exposure. For those with a dial-up connection, please be patient while the page downloads.
With an 80-300mm telephoto zoom lens attached, long-range shots like this are possible. A 35mm system would need a 450mm lens for this shot.
As with any SLR camera the macro capability depends on the lens that's being used. This was taken using a Sigma 28-200mm macro lens.
ISO 200: At this lowest setting there is no noticeable image noise and the shot has plenty of detail.
ISO 400: There is still no image noise and the shot still has good detail, as you can see from the small branches.
ISO 800: Still no image noise, but the noise reduction system is starting to soften the image slightly.
ISO 1600: A little bit of noise is starting to creep into the green channel, and more detail has been lost to noise reduction.
ISO 3200: There is noise visible on this shot, but it still isn't excessive. This setting would only be used in extreme circumstances anyway.
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