HD R/T
BINOCULAR
9
8
The R/T reticle is based on a form of angular measurement called
the milliradian (mrad for short). The angular measurements allow
a user to calculate ranges
when comparing the
reticle to objects of known
dimensions. The key to
effective ranging, using
this reticle, is knowing the
measurements of objects
that are commonly seen in
the vicinity.
u
sing
The
V
iper
r/T r
anging
r
eTicle
Reading the R/T Reticle
Fine crosshairs
subtend .05 mrad.
Heavy crosshairs
subtend .5 mrad.
1 mrad subtension marks
.5 mrad subtension marks
.5 mrad
1 mrad
28cm / 11”
50cm / 20”
35cm / 14”
44cm / 17”
79cm / 31”
All silhouette dimensions are accurate
at these ranges listed in meters.
The Viper HD R/T reticle
features a secondary system of
of silhouettes for quick ranging
(see page 12).
Subtensions
