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<blockquote data-quote="Steve B" data-source="post: 259126" data-attributes="member: 15754"><p>I think a lot of people misunderstand how the 1.3 crop works. It isn't any different than cropping your picture down in pp as far as resolution and detail are concerned. You end up with a 2x crop image (instead of a 1.5x) that uses a little more than 15MP of the sensor. It simply captures the data from a smaller area of the sensor. The one main benefit of the 1.3x mode is that the focus point pattern covers almost the complete FOV in that mode. The other benefits are a higher frame rate when using the high speed burst mode. The other reason I use if for sports sometime is that (I assume) that only the captured area is used for metering. This means you can get rid of some of the surrounding background that may negatively impact metering. As the user manual puts it &quot;producing a telephoto effect without the need to change lenses&quot;. Just remember it isn't a 24MP image anymore. One more thing that should be pointed out. This does not change the focal length of the lens so it does not change the DOF. This is a telephoto effect only. A 200mm lens at f/2.8 will have a DOF at 100ft of roughly 8 1/2' (on a D7100) no matter how much you crop it.</p></blockquote><p></p>

[QUOTE="Steve B, post: 259126, member: 15754"] I think a lot of people misunderstand how the 1.3 crop works. It isn't any different than cropping your picture down in pp as far as resolution and detail are concerned. You end up with a 2x crop image (instead of a 1.5x) that uses a little more than 15MP of the sensor. It simply captures the data from a smaller area of the sensor. The one main benefit of the 1.3x mode is that the focus point pattern covers almost the complete FOV in that mode. The other benefits are a higher frame rate when using the high speed burst mode. The other reason I use if for sports sometime is that (I assume) that only the captured area is used for metering. This means you can get rid of some of the surrounding background that may negatively impact metering. As the user manual puts it "producing a telephoto effect without the need to change lenses". Just remember it isn't a 24MP image anymore. One more thing that should be pointed out. This does not change the focal length of the lens so it does not change the DOF. This is a telephoto effect only. A 200mm lens at f/2.8 will have a DOF at 100ft of roughly 8 1/2' (on a D7100) no matter how much you crop it. [/QUOTE]

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