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<blockquote data-quote="Bob Blaylock" data-source="post: 496073" data-attributes="member: 16749">Putting aside issues about the quality of a sensor, and the presence or absence of an optical low-pass filter, 24 megapixels of resolution is 24 megapixels of resolution.&nbsp; I assume you understand about the “crop factor” of a DX sensor, and how that relates to the focal length of a lens?&nbsp; You seem to be comparing the performance of one 150-600mm zoom on a DX sensor to a different 150-600mm zoom on an FX sensor.&nbsp; Assuming the sensors to be of equivalent quality, and the optics to be of equivalent quality, the “crop factor” means that you're going to get a higher magnification on the DX sensor, which, if you're comparing similar subjects at similar ranges, is going to translate into more fine detail on the DX sensor.&nbsp; For the comparison to be entirely valid, you'd need a lens on the FX of approximately 1.5× the focal length of the lens you're using on the DX.&nbsp; For example, a 100-400mm lens on the DX would match the 150-600 on the FX, or a 225-900mm on the FX to match the 150-600 on the DX.&nbsp; It may also help to realize that the difference between a 24mp DX and a 24MP FX is that the DX has the same number of pixels crammed into a smaller space; so with the same or equivalent optics, the DX gets finer detail, of a smaller angle of view.</blockquote>

[QUOTE="Bob Blaylock, post: 496073, member: 16749"] Putting aside issues about the quality of a sensor, and the presence or absence of an optical low-pass filter, 24 megapixels of resolution is 24 megapixels of resolution. I assume you understand about the “crop factor” of a DX sensor, and how that relates to the focal length of a lens? You seem to be comparing the performance of one 150-600mm zoom on a DX sensor to a different 150-600mm zoom on an FX sensor. Assuming the sensors to be of equivalent quality, and the optics to be of equivalent quality, the “crop factor” means that you're going to get a higher magnification on the DX sensor, which, if you're comparing similar subjects at similar ranges, is going to translate into more fine detail on the DX sensor. For the comparison to be entirely valid, you'd need a lens on the FX of approximately 1.5× the focal length of the lens you're using on the DX. For example, a 100-400mm lens on the DX would match the 150-600 on the FX, or a 225-900mm on the FX to match the 150-600 on the DX. It may also help to realize that the difference between a 24mp DX and a 24MP FX is that the DX has the same number of pixels crammed into a smaller space; so with the same or equivalent optics, the DX gets finer detail, of a smaller angle of view. [/QUOTE]

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