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Message: <blockquote data-quote="WayneF" data-source="post: 227104" data-attributes="member: 12496">You probably want both, but it depends on what you are shooting, rooms or portraits.  You said FX and studio and portrait.70mm on FX has a horizontal field of view of 28.8 degrees.  That is 5.1 feet of field at ten feet.   That is pretty wide for a portrait, you'd want to zoom in more.  But it's too narrow for a  group or a room view.It is similar triangles, compared to 70mm,  140mm is half as wide, and 35mm is twice as wide. But it is not really about focal length, it is about field of view.DX 70mm is 19.1 degrees, or 3.3 feet view at ten feet, useful for portraits.</blockquote>