The three factors controlling unsharpness are source size source to object distance and object to detector distance. SID you can apply the formula as follows pg. Figure 3 was taken with a shorter SFD 8 in and the produced geometric unsharpness is Ug 78 x 103 in.
SID you can apply the formula as follows pg.
The trick is to remember measuring to-and-from the top-side of the specimen for the t d. 2166 mm x 5 in. The value of the nth term of the arithmetic. Ug f ba.