Farpoint 125mm Vixen Dovetail Rings with Dovetail

Product Overview

The Farpoint FVDR125 is a complete tube ring set — two rings of 125 mm inside diameter, each with three-point adjustment, supplied already mounted on an 8″ Vixen-style (V-size) dovetail bar. It is the largest ring size in Farpoint's Vixen ring line, and it arrives as one assembly: the tube clamps in the rings and the bar drops into a Vixen saddle. Farpoint machines and assembles the set in the United States, and the published weight is 1.875 lb.

Who It's For

This is a good match if you…

• have an optical tube of 115 mm outside diameter or less and want the rings and the bar in one purchase.
• are mounting a 4″ to 4.5″ refractor or a similarly sized tube on a Vixen-style saddle.
• want three-point centring rather than the two-screw arrangement used on lighter rings.
• would rather not measure, source and drill a separate bar to match a ring spacing.
• rotate the tube between sessions to reposition a focuser or finder.

Key Features & Design

• 125 mm ring inside diameter: accepts optical tubes up to 115 mm outside diameter — the ring I.D. less 10 mm — and any smaller tube within the adjustment range.
• Three-point adjustment: each ring carries three adjusters, so the tube is centred on three contact points rather than pinched between two.
• 8″ Vixen dovetail bar included: the V-size bar ships with both rings already fitted and spaced.
• Single-piece assembly: ring spacing and bar alignment are set at the factory, so the two ring bores arrive coaxial.
• Largest Vixen ring size Farpoint lists: the 125 mm bore covers the widest tubes in this ring family.
• Made in the USA: machined and assembled by Farpoint in the United States, published weight 1.875 lb.

Mechanical Design

Three-point adjustment spaces the contact screws evenly around each ring, which holds the tube on its own axis instead of pushing it toward one wall of the ring. That shows up when the tube is rotated to bring a focuser or finder to a new angle, because the optical axis stays where it was. Both rings are mounted to the 8″ bar at the factory, so their bores are already in line and no shimming is involved. The bar is a standard V-size profile — the same cross-section a Vixen saddle clamps on — and its 8″ length sets the fore-and-aft travel available for balancing. With a 125 mm bore the adjusters have a wide span to work across, so a tube well under 115 mm can still be centred.

Recommended Uses

• Mounting a 4″ to 4.5″ refractor on a Vixen-saddle equatorial or alt-azimuth mount.
• Carrying a large guide scope beside a main instrument on a side-by-side plate.
• Rotating a tube to bring the focuser to a comfortable viewing angle while keeping pointing.
• Replacing clamshell rings where independent ring spacing along the tube is wanted.
• Holding a wide short-tube astrograph where a 108 mm ring would be too small.

Compatibility and Accessory Notes

The dovetail is V-size, the Vixen standard, and it seats in the saddles found on Sky-Watcher EQ and AZ mounts, Celestron CG-5 and Advanced VX, iOptron equatorials, and the dual-format saddles on Losmandy and Sky-Watcher EQ6-R class mounts, along with any other clamp cut for a Vixen profile. A saddle machined only for the wider D-size (Losmandy) profile takes a different bar or an adapter. On the tube side the working range runs from 115 mm outside diameter downward: a tube near 115 mm sits with the adjusters barely extended, a smaller tube with them further in. If you are unsure where your tube falls, send us its make, model and measured outside diameter and we will check the fit for you.

Good to Know Before You Order

• Ring I.D. is 125 mm, usable tube O.D. is 115 mm. The 10 mm difference is taken up by the adjustment hardware, so 115 mm is the largest tube the set holds.
• The bar is 8″ long. That length sets the available balance travel in the saddle; a longer bar gives more fore-and-aft range, which matters more on a heavier 115 mm-class tube.
• The dovetail is Vixen, not Losmandy. A saddle cut solely for the D-size profile calls for an adapter or a different bar.
• Farpoint publishes no tube liner or padding for this set. The adjusters bear on the tube directly.
• Published weight is 1.875 lb. Rings and bar ship together as a single item.

Frequently Asked Questions

Is it difficult to install?

No. The rings arrive already on the bar, so fitting comes down to opening the rings, seating the tube, snugging the three adjusters on each ring until the tube is centred, and sliding the bar into the saddle.

What size tube does it hold?

Any tube of 115 mm outside diameter or less. The rings measure 125 mm inside and the adjustment hardware occupies the remaining 10 mm.

How does it differ from the 108 mm set?

Bore size only. The 125 mm rings reach 115 mm of tube diameter where the 108 mm rings reach 98 mm; both use the same three-point adjustment and the same 8″ Vixen bar.

Can the tube be rotated after it is clamped?

Yes. Backing the adjusters off lets the tube turn in the rings, and the three-point arrangement brings it back to the same centre when they are snugged again.

Does it fit a Losmandy saddle?

It fits any saddle that accepts a Vixen (V-size) profile, including dual-format saddles. A clamp cut solely for the D-size profile is a different standard.

Bottom Line

In short: a US-made assembly of two 125 mm three-point rings on an 8″ Vixen bar, published at 1.875 lb and covering optical tubes up to 115 mm outside diameter under a single part number.