XTi's megapixels
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Old 12-05-2006   #1
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Default XTi's megapixels

Does the XTi have "quality" megapixels? Or is the sensor too small to really fit that many megapixels without reducing image quality or dynamic range? I've read that unless the sensors get bigger, we're at a practical limit so far as megapixels go.

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Old 12-06-2006   #2
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Default Re: XTi's megapixels

The Rebel XTi has basically the same size sensor as the higher-end models (20D, 30D).

When people talk about small senors they are usually referring to the tiny sensors in compact cameras.

The Rebel should be able to give very good quality.

Comparison of sensor sizes is available at http://www.dpreview.com/learn/?/Glos...r_sizes_01.htm

John

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Old 12-06-2006   #3
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Default Re: XTi's megapixels

Actually, at the APS-C size, the 12.4 megapixel Nikon D2X (sensor size: 23.7x15.7mm ~1.53x crop) is considered on the threshold of the red zone where the effects of diffraction from stopping down the lens are visible even at wider apertures due to the photosite size and pitch. For utmost quality, the effective limit with the D2X and most lenses is f/11; past f/11, the edges start to go, and stopping down further for more DOF will come at the expense of hard edges.

The Rebel XTi's approaching that range, but it's not there yet.
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Old 12-06-2006   #4
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Default Re: XTi's megapixels

I haven't used the XTi yet. I will by the end of the month. From what I've read, however, the XTi is less forgiving of mediocre lenses than previous iterations of the XT line. That would mean, ironically, that users of this camera geared toward the budget-minded may have to put out serious money for higher-end lenses if they want to get the image quality that the higher megapixel count promises.


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