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Pentax Point and Shoot and Non-DSLR
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Pentax Optio M40 Digital Camera Reviewby Karen M. CheungPublished on October 12, 2007
Metering (2.0) The Pentax M40 doesn’t offer much in the metering department. The camera is set to TTL multi-pattern metering. Other cameras sometimes offer more control with center-weighted or spot metering. White Balance (6.75) The Optio M40’s white balance covers the basics. Options for Auto, Daylight, Shade, Tungsten, Fluorescent, and Manual will be able to adjust the camera for a variety of indoor and outdoor lighting. Some cameras have multiple fluorescent settings, but the Pentax M40 does not. That shouldn’t matter too much because the included Fluorescent setting yields accurate color under fluorescent lights. Users can also manually adjust white balance.
Pentax expanded the ISO sensitivity range on the Optio M40, upgraded from the earlier M30. The camera has an auto ISO range of 50 to 1600 ISO, expanded from the M30’s 64 to 1600 ISO range. The M40 gives users the options to manually set sensitivity between 50 and 1600 ISO. There is a 3200 ISO setting in Digital SR mode. Users should be careful, though, because the high sensitivity mode significantly affects dynamic range and increases noise in images.
The Pentax M40’s shutter speed can’t be manually changed. The shutter speed range is 4 seconds to 1/2000 of a second. Marginal control over the shutter speed is available using the Scene modes. For instance, Night Scene slows the shutter speed, while Sport speeds it up. Aperture (0.0) Like shutter speed, users can not manually adjust aperture controls. The lens focuses at a limited FF-stop range between f/3.1 to f/5.9 that automatically changes depending on the set modes, such as Portrait or Flower. Most other cameras offer a wider aperture range.
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