Trying to figure what the scale is on a photo(measurement)?

Simple division:

6.5 = 52/8

52/8 on the deer = 3/8 on the picture,

so the scale is 52 : 3 (or 3 : 52)

13/16 * 52 / 3 = 676 / 48 = 14.08 inches

Another way to check:

tine / ear should be the same in both

tine / ear = (13/16) / (3/8)

tine = 13 * 8 / 16 * 3 = 104 / 48 = 2.16667 times the ear.

That times 6.5 = 14.08

Two things to keep in mind:

1)

Even if the average ear is 6.5 inches,

this one could be 6.25 or 6.6 or what have you.

Every deer will have a slightly different size ear.

So your estimate should be in a range, not a specific number.

2)

Since you are multiplying by 52/3 (around 17),

whatever error you make in measuring on the photo

is magnified by a factor of 17.

So if you are off by 1/16" on the photo measurement,

you'll be off by about 1" on the actual size.

The accuracy of the estimate you need will determine

how carefully you make the measurements on the photo.