I think there's a lot of misunderstanding here and a lot of optically correct comments are being down voted. 50mm is a focal length. If what you like about 50m

I think there's a lot of misunderstanding here and a lot of optically correct comments are being down voted. 50mm is a focal length. If what you like about 50mm is indeed the perspective (as opposed to other subtle things that may creep like aperture/bokeh or aberration or vignetting of the specific lens) then zooming something to 50mm effective field of view is exactly what will accomplish the goal.