Farpoint Dovetail System · Guide Scope Rings
Mount your guide scope on the dovetail — rigid, aligned, adjustable.
The Farpoint 90mm D Style Dovetail Rings are a pair of 90mm inner-diameter rings that bolt to a D-size (Losmandy-style) dovetail plate and carry a guide scope, finder, or other optical accessory on top of your telescope. Three adjustment screws per ring center the tube, grip it securely, and let you aim the guide scope precisely — a rigid platform for autoguiding and wide-field imaging.
Specifications
Includes
Two rings with 3-point adjustment screws (standard 1″ length)
Ring inner diameter
90mm
Holds
Guide scopes, finders, and accessories with tube O.D. below 80mm
Mounts to
D-size (Losmandy-style) dovetail plates — dovetail not included
Construction
CNC-machined in the USA
Which Ring Size?
Pick a ring at least 10mm larger than your guide scope's tube O.D. — the adjustment screws take up the difference.
Product
Ring I.D.
Holds
90mm D RingsThis model
90mm
Tubes below 80mm O.D.
Tube much smaller than the ring? Swap to long 1.5″ screws for extra reach — or short .5″ screws for tubes close to the ring's working limit.
Frequently Asked Questions
Will these fit my guide scope?
The rings hold any tube with an outer diameter below 80mm — the ring needs at least 10mm over your tube O.D. so the three adjustment screws per ring can center and grip it securely. If your tube is much smaller than the ring, long 1.5″ screws add reach. Using a V-size (Vixen) setup? See our Vixen scope rings.
Is the dovetail bar included?
No — the rings bolt to a D-size (Losmandy-style) dovetail plate you already have. Need the plate? See our universal D-size dovetail bars.
What is the 3-point adjustment for?
Building out a D-size dovetail rig?
Browse the guide scope ring line, or start with the dovetail system guide.
Shop all guide scope rings Read the dovetail guide
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