Crop sensor performance vs 1.4X teleconverter
John Landolfi wrote: No. You lose aperture with a converter because you are putting extra glass between the light and the sensor. The crop sensor just gives you a smaller, central portion of the image a full crop would produce, so will have no effect on aperture, all else being equal. The converter may also raise some sharpness isues, which is why choosing the best you can afford is recommended. Not much sense in putting the image produced by a first rate lens through an inferior add-on.
Also they are not the same one does so through optics, the other does so through cropping the field. You do not get more reach with the crop sensor, say you are using a 400mm lens, the lens is still 400mm with the exact same magnification on both formats, the difference is that the 1.5x give you an apparent field of a 600mm, not the magnification. Crop sensors only crop the field that is why they are called crop cameras. Some marketing people made up the magnification BS, and it has been perpetuated since then. The 1.4x TC will degrade the image as said but it actually lengthens the focal length, therefore increasing the magnification.
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