LCT
Member
Depends if one refers to compression as a synonym of perspective or to the feeling of compression resulting from the combined effect of perspective and DoF....on a 25mm lens, on m4/3 camera, will the background compression still be that of a 25mm even though the FOV is magnified x2 (50mm?)
(a) Perspective remains the same if you stay exactly at the same place, i mean if you shoot your FT 25 from the exact same place as you would do with an FF 50. It is not a matter of focal length, aperture or shutter speed at all. See http://tinyurl.com/34g6xh6.
(b) Even if perspective doesn't change, we may have a different feeling of compression due to a different DoF. To avoid this, perspective must remain the same and DoF must remain the same as well.
By example, you'll get the same perspective and the same feeling of compression if you shoot your FT 25 at f/0.95 exactly from the same place as you would do with an FF 50 at f/1.9.