The designer of the Centra sight, Robert Chombart, posts here occasionally (as R.G.C.) and I know of a few folks who use them quite successfully.
Thanks, Nate.
Heavies,
Every brand has advantages, and the posts here shows individual preferences…
Only in technical, here are the points I considered when Centra asked me to design the sight:
-1) Backlash: This is a long term problem on friction pivots, and provision for adjustment (with all what that implies) is to be provided.
The Centra has 2 pre-loaded ball bearings on each leadescrew. This is an absolute long term zero backlash. The principle is similar to the CNC machines mpcements screws.
The Centra is the first to have used Stainless steel hardened thread-ground leadescrews. The bronze nuts length is 3 times the screw diameter, allowing 19 pitches engagement and te threads are of the accuracy tolarances of those of a micrometer…
2) Knobs; Must be independent of the hub for many reasons already expressed by posters here.
3) Scales; It was asked to be easy zeroing and visible on most directions. Placing them at 45° to the rear was the obvious solution, visible also when in position. The ‘Easy-zero’ system was a basic requirement as well.
4°) Modular construction: Make most of the parts identical for L/H and R/H, and also only one piece different for the various base fittings (5 different). This modular construction allow all possibilities: height (tube guns and AR heights), offset for aiming with the opposite eye, etc…The sight can virtually be built to the demand.
R.G.C