Question about focal lenghts and distances to objects etc.

Caporegime
Joined
17 Jan 2010
Posts
66,731
Location
weston-super-mare
Yo photo geeks.

Here's one for you,

Say I am photographing a PC case with my DX camera with a 50mm 1.8G lens.

Using this I am almost across the room (say approximately 5ft away) with my back against the wall trying to get the whole case into frame without cutting the top or bottom of it off etc.


How much closer or how far away from the case could i be to still have the same size image in the camera frame using say,

35mm
18-24mm

I would rather be 2-3ft way that way I can still sit in my chair and use the tripod.
 
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