The short conclusion is: 1) if crop_1,6 = better to take 40mm f/2.8 STM 2) if you rarely shoot video = 40mm f/2.8 STM 3)if full frame=better than 50mm f/1.8 4) if you FREQUENTLY shoot video (! with manual autofocus) = 50mm f / 1.8 5) if the brightness of the picture in the viewfinder is categorically important, or it is important to blur the background in portraits especially strongly = 50mm f / 1.8 is better = differences 40/2.8 from 50/1.8 * made much nicer and more modern. The bayonet is steel, the case is of high quality, there are no backlashes. * Aperture worse than 2.8 versus 1.8 will affect the lightness of the picture in the viewfinder, the work of autofocus points in some cameras. * I would like to mention that for the same reason 50 / 1.8 blurs the background better, or takes pictures in the dark - but this is half true, 50 / 1.8 on an open aperture is bad and works normally starting from the same 2.8 *Autofocus is better - a good quiet USM (a simple motor in a competitor), but if you switch to manual focus, manual focus still works from the motor, there is no direct drive, in manual ambush mode \u003d still turns the motor, this reduces feedback + the sound of the motor is recorded on the video. \u003d focusing depends on the speed of rotation - and it can take a long time to catch the exact focus point - it infuriates. = and there is no direct connection, I want to twist it with my hands in auto mode (as in expensive lenses), but no - oddly enough. >>for manual focus 50/1.8 is preferable. * Bokeh - 40 / 2.8 = 7 petals versus 5 is better. * Focal - 40k closer to crops in terms of "normality" * The picture is generally the same for both, the difference is in close-up portraits. 50 / 1.8 can blur and fog more * Convenience, clear leadership for 40 / 2.8 with it, the camera is thinner. Moreover, on crops - it allows you to shoot indoors in the sky (50mm indoors will not really let you shoot on crop - nothing will fit) 50 / 1,8 is better because it does not have a retractable trunk + the lens does not get dirty (it is securely recessed inside)
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