I always try and carry a camera when on a family walk. That
camera is  also always switched on and ready to go - Why carry it 
otherwise.

This  shot is on the beach near Robin Hood`s Bay,  Yorkshire. 
The woman walked past with her dog and I turned round, focused
INFRONT of them, then, as they moved into focus, pressed the
release. This is a good trick if you don`t have autofocus,  and
is often a  good idea even if you do.


The  camera was a Pentax ME Super,  with 70/210 Vivitar zoom. 
The zoom gives the chance to alter the composition rapidly in
order to achieve the best effect.  Modern zoom quality is so good
that they rival fixed focal length lenses for most purposes.

Composition for this type of picture usually looks best using 
the rule  of thirds.  That sets the main subject towards the
left,  or right  of the frame.  In this case,  the woman was
given space  to walk into.