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Program mode I have a question about the program mode. there are 4 choices according to the manual: 1. Normal, 2-High-peed priority, 3-Depth-of-field priority, 4-MTF priority. I know I am going to feel stupid, but what is MTF priority? I wasn't any good at acronyms in the service either.

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MTF = Modular Transfer Function. MTF tests is a chart describing the lens performance (sharpness, contrast etc.) throughout the aperture range. All lenses has a "sweet spot", where the best performance is given. But this can vary, not just from lens type to lens type - but also sample to sample (due to manufacturing tolerances). Each sample of modern Pentax lenses (FA, and to my knowledge also DA) are MTF tested - and the aperture which gives the best performance is coded in the MTF chip and read by cameras supporting MTF program. MTF program line simply tries to set this optimum aperture, or coming as close as the light conditions allow.

Posted on Sep 08, 2005

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MTF stands for "Modulation Transfer Function" ... It's a somewhat arcane name for one type of testing methodology used in modern lens analysis. The *ist D's MTF priority program mode sets the "best" aperture to use for a given ISO setting and meter reading based upon lens information encoded in the latest FA series lenses. Earlier series lenses do not include MTF information in their communication with the camera so I suspect it defaults to Normal program mode when non-FA lenses are used.

Posted on Sep 08, 2005

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Here is a list of things to check:
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How does aperture setting affect a photograph?

The aperture is the opening in the lens through which light passes to the image sensor. Changing the aperture setting allows you to control the depth of field of a photograph. When the aperture is opened to a widersetting, (indicated by a lower f-stop number) more light is passed to the imagesensor, creating more shallow depth of field. Closing the aperture (indicatedby a higher f-stop number) allows less light to pass to the image sensor,creating wider depth of field.

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Feb 10, 2009 • Cameras
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Aperture

Hello,

On digital cameras you set the camera to Aperture priority and then use your spin dial to set the lowest aperture possible and let the camera set the shutter speed.

In basic terms, the lower the aperture number the shorter depth of the vision field that will be in focus. This is called Depth of Field.

If your camera doesn't have an Aperture priority, usually a capital A on the program dial, you are a bit out of luck... that said, almost all cameras today have this feature. Yours may also be accessed by setting the program dial to Closeup or Portrait mode where the camera will use a short Depth of Field to blur out the background.

Hope that helped of fixed your dilemma.
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