>>3599074>You can also hold the aperture preview button while unmounting the lens, that will keep the aperture.That only happens with some lenses and cameras. My D3400 and kit lenses do not do that. A reverse ring adapter isn't itself electronic, just manual.
>Also dust. On reversed lenses dust becomes visible and problematic extremely quickly. It's a constant annoyance.That is what happens with all macro photography. It has nothing specifically to do with being reversed or not. Just clean the sensor well then use spot heal or similar editing tool in post. It will be more noticeable than normal with tighter aperture settings, pinholes, macro/super macro, and micro. Reversing the lens normally takes the lens into macro 1:1 or super macro; depending on the lens.
