Zeroing Scope's Adjustments

Bart B. · February 23, 2021, 10:52 AM

Why does setting the scope's elevation and windage adjustments midpoint in their mechanical limits make the line of sight point away from the scope's optical axis that's on the outer tube's center?

oldmanFCSA · February 23, 2021, 11:42 AM

The adjustment range within the scope may not be perfectly centered with relationship to the outside tube.

Some scope base/ring combinations allow for windage adjustment by using side screws on basses to center the internal adjustment capability without using the internal adjustment.

Those of us that shoot ELR (Extra Long Range) use scope bases with "cant" built in to permit centering of scope distance range without using most of the adjustment range. Such as a 15, 30, 55, etc. MOA base Cant. (Front of base is thinner to tip scope forward).

This supposedly allows for best strength of internals and the most capability of any future adjustment for range or windage.

YMMV.

Bart B. · February 23, 2021, 11:50 AM

Quote:

Originally Posted by oldmanFCSA

The adjustment range within the scope may not be perfectly centered with relationship to the outside tube.

I've never seen a scope that was. They all quit moving the LOS left and down before reaching the LOF right and up mechanical limits.

February 23, 2021, 10:52 AM	#1
Bart B. Senior Member Join Date: February 15, 2009 Posts: 8,927	Zeroing Scope's Adjustments Why does setting the scope's elevation and windage adjustments midpoint in their mechanical limits make the line of sight point away from the scope's optical axis that's on the outer tube's center? Last edited by Bart B.; February 23, 2021 at 11:14 AM.

February 23, 2021, 11:42 AM	#2
oldmanFCSA Senior Member Join Date: November 8, 2010 Location: WISCONSIN Posts: 283	The adjustment range within the scope may not be perfectly centered with relationship to the outside tube. Some scope base/ring combinations allow for windage adjustment by using side screws on basses to center the internal adjustment capability without using the internal adjustment. Those of us that shoot ELR (Extra Long Range) use scope bases with "cant" built in to permit centering of scope distance range without using most of the adjustment range. Such as a 15, 30, 55, etc. MOA base Cant. (Front of base is thinner to tip scope forward). This supposedly allows for best strength of internals and the most capability of any future adjustment for range or windage. YMMV. __________________ OldmanFCSA = "Oldman" at www.fcsa.org FCSA Member, SCSA Member, NRA Member, & AMA Member "Oldage & Treachery will overcome Youth & Skill"

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search