The Power of Gray - The Photoshop: Professional Retouching and Compositing Tips, Tricks, and Techniques - page 78

Tip
Generally when I shoot a full-length photograph of a model in the studio I am
down on one knee and using my go-to lens, a 70-200mm ( Figure 2.3 ) . Because I
know that this is the position I use when photographing a full-length shot, when
I'm out and about and see what I think would make a great background I adopt
the same position, using the same lens with roughly the same focal length.
Figure 2.3
Doing this means that the perspective of the background ( Figure 2.4 ) and model will match
closely, and blend seamlessly when combined in the composite.