3 adjustment weaver

[flounderman]

I saw a weaver with three adjustment turrents. seems like I remember a scope like this, but what is the purpose of the third turrent? range finder? parallax?

[TCLouis]

Variable power scope from time long ago.

I have one that came on my 257.

[deltaenterprizes]

The new scopes with the third knob is for parallax, Leupold started this I think.

[flounderman]

the scope is a k-v, 2 3/4 to 5. weavers first variable.