You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser.
Join the #1 community for gun owners of the Northwest
We believe the 2nd Amendment is best defended through grass-roots organization, education, and advocacy centered around individual gun owners. It is our mission to encourage, organize, and support these efforts throughout Oregon, Washington, Idaho, Montana, and Wyoming.
Discuss firearms and all aspects of firearm ownership
Join others in organizing against anti-gun legislation
Buy, sell, and trade in our classified section
Find nearby gun shops, ranges, training, and other resources
Discover free outdoor shooting areas
Stay up to date on firearm-related events
Share photos and video with other members
...and much more!
The focal length of an optical system is a measure of how strongly the system converges or diverges light. For an optical system in air, it is the distance over which initially collimated (parallel) rays are brought to a focus. A system with a shorter focal length has greater optical power than one with a long focal length; that is, it bends the rays more sharply, bringing them to a focus in a shorter distance.
In most photography and all telescopy, where the subject is essentially infinitely far away, longer focal length (lower optical power) leads to higher magnification and a narrower angle of view; conversely, shorter focal length or higher optical power is associated with lower magnification and a wider angle of view. On the other hand, in applications such as microscopy in which magnification is achieved by bringing the object close to the lens, a shorter focal length (higher optical power) leads to higher magnification because the subject can be brought closer to the center of projection.
Looking to sell my Vortex Viper PST scope. This is a first generation scope with a 30mm tube and is Front Focal Plane
Model number is PST-416F1-M. This has the illuminated MRAD Reticle.
I bough this used from another forum, and that person stated that they had it on a Remington 700 VSF in .223...
I have a like new Gen2 Vortex Viper PST 5-25x50 Front Focal Plane MRAD ebr-2c Scope with Vortex Switchview Throw Lever and Bubble Level. MIL/MIL Turrets/Reticle. Comes with Box and usual contents from the factory, Flip-up Caps, Sunshade, etc...
LINK: Vortex Optics - Viper PST Gen II 5-25x50...