The properties of light in terms of wavelength size don't change with the size of the sensor. Due to the way the ratio of linear edges to area increases as a pixel gets smaller, a sensor with larger pixels and otherwise the same technology will be more efficient. If you need to shoot at f/11 which camera will have an advantage? The FF camera with a DLA of f/10.1 or the APS-C camera with a DLA of f/6.6? Using a smaller sensor does not reduce the size of the wavelength of light at a specific frequency.Īlong with the transmission loss and potential aberrations due to the additional glass a teleconverter places in the optical path one needs to also consider the differences in efficiency of the two sensors being compared. Let's look at another variable: diffraction. If, on the other hand, you need all 22MP then the TC on the FF or the APS-C camera with the same bare lens becomes much more attractive. If the final use of the image only requires a resolution of, say, 2400x1600 pixels (3.8MP) then it doesn't matter at all if you crop a 22MP FF image down to an 8.6MP image to get the same angle of view as a 22MP APS-C camera would deliver with the same lens. There are way too many variables from one camera/teleconverter/lens combination to the next to usually be able to say for sure one way or another which is best.Ĭonsider just one such variable: the needed resolution of the final image. I've seen in-depth analysis that has gone one way with a particular camera/converter/lens combo and other comparisons with different cameras/converters/lenses that swung the other way. But not all extenders are optically inferior to high grade lenses. Adding a low grade TC to a high grade lens and camera should be expected to degrade image quality worse than cropping with a bare lens. Optical quality is never better than the weakest link in the equation. The same is true when comparing a full frame camera + 1.4x to an APS-C camera when both use the same lens. It depends entirely upon the teleconverter in question, the lens in question, and the full frame and APS-C cameras in question.
A good teleconverter or extender works better than cropping if the lens can outresolve the resolution of the sensor by an amount greater than the degradation of the TC and the resulting loss in lens speed is not a determining factor in the viability of the shot.
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