Farpoint Dovetail System · Radian Bar Design
The Radian bar design, stretched to 21.5″ — the longest universal bar in the lineup, for long tubes and maximum balance range.
This 21.5″ 57.3 Series universal dovetail bar is Farpoint's extension of the Radian lightweight universal D-style dovetail bar we originally manufactured for OPT — the same light-weighted design with a variety of mounting hole options, scaled up for long optical tubes and heavy imaging trains. D-size (Losmandy-style). Machined of sturdy aluminum with a black anodized finish. CNC-machined in the USA.
From Radian Bar to 57.3 Series
Farpoint manufactured the original 14″ bars for OPT (Oceanside Photo & Telescope), who sold them under the Radian Telescopes brand. When OPT closed its doors, we continued the line under the 57.3 Series name — same tooling, same USA machining, sold direct from the manufacturer — and expanded the design into this 21.5″ length plus a compact 6″ version.
Specifications
Bar length
21.5″
Series
57.3 Series — extended from the original Radian bar design
Bar standard
D-size (Losmandy-style)
Design
Light-weighted universal bar — variety of mounting hole options
Finish
Black anodized aluminum
Construction
CNC-machined in the USA
Which Universal Bar?
Bar
Length
Holes
57.3 Series 21.5″This model
21.5″
Variety of mounting holes
Check your hole pattern before ordering. Need mounting-hole locations and measurements? Email us for the product drawing, or to confirm fit with your tube and rings.
Frequently Asked Questions
Is this the Radian dovetail bar?
It's our extension of it. Farpoint manufactured the original 14″ bars for OPT (Oceanside Photo & Telescope), who sold them under the Radian Telescopes brand. With OPT now closed, we sell the line direct under the 57.3 Series name — and this 21.5″ stretches that same design for bigger rigs. The original length lives on as the 57.3 Series 14″ bar.
Why choose the 21.5″ length?
Long tubes and heavy imaging trains need wide ring spacing and room to slide the assembly for balance. At 21.5″, this is the longest universal bar in the lineup — if you don't need the reach, the 14″ original Radian length saves money and weight.
What mounts will this work with?
Any mount with a D-size (Losmandy-style) saddle. Mount still has a small Vixen saddle? Our D-size saddles and conversions upgrade it.
Building out a D-size dovetail rig?
Browse all universal bars, or start with the dovetail system guide.
Shop universal D-size bars Read the dovetail guide
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