[Tweeters] Getting distance to subject from your camera more comment

[dgrainger at birdsbydave.com]

In the past I have paced off the horizontal distance from my stance to 
the tree trunk on which my subject had been perched, did a rough 
estimate of the angle from where I shot to photo to the perch or a SWAG 
guess of the height of the perch, then did the math. Since I was 
guessing at two of the three pieces needed to solve that triangle I was 
pretty inaccurate. DISCLAIMER: This is not OCD, needed those distances 
for some images.