The hardware tilt-shift naturally avoid these effects, as the defocused stars are not saturated on the sensor, keeping their color, and brightness. These effects can be seen easily by applying available digital tilt-shift filters to your astrophotos. Also, the defocused stars lose their colors as they are saturated on the sensor, giving only white stars. This is because of the preliminary enhancement applied to the image, which in all the case reduces the actual strength of the surrounding stars (via actual saturation of the sensor by the focused stars as well as non-linear stretching of the histograms). But, software tilt-shift effect give somehow the weird effects, like having the stars disappear farther from the object, which (to me) totally ruins the closeness impression. Software tilt-shift seems like the easiest way to create the miniature effect on astrophotos, with ready to use digital filter that can be used on any astrophoto.
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