Telescopes and accessories are often equipped with a prism rail - also called a dovetail bar. This rail can be attached firmly by means of a dovetail clamp to, for example, an astronomical mount.
Two standards have been established for the rails: the relatively narrow rails introduced by the Japanese manufacturer Vixen and the wider Losmandy rails. The latter are 3 inches wide and are mainly used for heavy telescopes.
Accordingly, there are dovetail clamps for Vixen or Losmandy rails. Dual dovetail clamps can accommodate both sizes.
PrimaLuceLab
PLUS Vixen / Losmandy prism clamp
$ 78.13
ready for shipping in 24
h
Omegon
Dual prism clamp (Losmandy- and Vixen-Style)
$ 99.16
ready for shipping in 24
h
ASToptics
80MM DX LOSMANDY LEVEL DOVETAIL CLAMP
$ 113.19
Sale price:
$ 78.83
ready for shipping in 24
h
ASToptics
150MM DX LOSMANDY LEVEL DOVETAIL CLAMP
$ 205.34
Sale price:
$ 109.67
ready for shipping in 24
h
William Optics
Vixen-Style 90mm Prism Clamp
$ 113.19
ready for shipping in 24
h
Rowan
Dual Vixen/Losmandy Prism clamp for AZ100
$ 319.53
Sale price:
$ 180.50
ready for shipping in 24
h
PrimaLuceLab
PLUS Vixen /Losmandy prism clamp, large
$ 166.28
ready for shipping in 24
h
Artesky
Vixen-Style Prism clamp 150mm
$ 56.09
ready for shipping in 24
h
ASToptics
DX VIXEN/LOSMANDY CLAMP, 150MM
$ 227.38
Sale price:
$ 164.51
ready for shipping in 24
h
Bresser
Dovetail clamp Messier Vixen-Style
$ 44.97
ready for shipping in 24
h
Losmandy
Prism rail with two V/D prism clamps
$ 456.76
ready for shipping in 1-2
weeks
PegasusAstro
Saddle Powerbox NYX-101
$ 520.87
ready for shipping in 24
h
ZWO
Prism clamp for ASIAIR Plus
RRP:
$ 91.15
Our price:
$ 51.08
ready for shipping in 24
h
Geoptik
Universal Losmandy/Vixen saddle plate, 450mm
$ 377.63
Product can be shipped as of 01.08.2026
Geoptik
Losmandy to Vixen reducer
$ 92.15
ready for shipping in 24
h
Geoptik
Vixen / Losmandy prism clamp
$ 92.15
ready for shipping in 24
h
Geoptik
Losmandy to Vixen reducer
$ 92.15
ready for shipping in 24
h
Geoptik
Vixen-Style Prism clamp 80mm
$ 43.97
ready for shipping in 24
h
Vixen
Polarie Multi Mounting Block
$ 182.30
ready for shipping in 1-2
weeks
PrimaLuceLab
Prism clamp PLUS Vixen/Losmandy Maxi
$ 226.38
ready for shipping in 1-2
weeks
iOptron
Secondary Dovetail Saddle
RRP:
$ 136.23
Our price:
$ 124.21
ready for shipping in 3-5
weeks
ADM
Dual Saddle Plate XL for Skywatcher EQ-6R PRO mount
$ 433.72
ready for shipping in 24
h
Artesky
Vixen-Style Prism clamp 80mm
$ 49.98
ready for shipping in 3-7
days
Geoptik
Prism clamp, Losmandy-Style
$ 44.97
ready for shipping in 24
h
Baader
Prism clamp, with handle, for Losmandy-style prism rail
$ 95.16
ready for shipping in 1-2
weeks
TS Optics
Prism clamp Premium XL Vixen-Style
RRP:
$ 75.12
Our price:
$ 62.10
ready for shipping in 3-7
days
TS Optics
Vixen-Style Premium Prism Clamp
$ 62.10
ready for shipping in 24
h
ADM
VSAD-GP Vixen Great Polaris
$ 296.49
ready for shipping in 24
h
Losmandy
Vixen / prism clamp
$ 103.17
ready for shipping in 1-2
weeks
Vixen
Prism clamp
$ 68.11
ready for shipping in 3-7
days
PegasusAstro
Universal Clamp
$ 170.28
ready for shipping in 24
h
Artesky
Guidemount - ultra-compact Vixen GP level dual mount
$ 148.25
ready for shipping in 3-5
weeks
iOptron
iGuider Prism clamp
RRP:
$ 79.13
Our price:
$ 52.09
ready for shipping in 24
h
Baader
Planewave-Clamp 8"
$ 621.03
ready for shipping in 24
h
Geoptik
Vixen-Style Prism clamp 80mm
$ 43.97
ready for shipping in 24
h
ADM
VSAD CEM26/GEM28
$ 284.47
Sale price:
$ 142.80
ready for shipping in 24
h