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Your partner for astronomy

Star diagonals are important devices that divert the path of the beam of light coming from the telescope so that you do not have to strain to see, but can view comfortably and hence enjoy your observing more. The star diagonal’s prism deflects the light by 90°. Refractors, Schmidt-Cassegrain and Maksutov optics often need this device.

Amici prisms divert the light, usually by 45° or even 90°, providing an upright and non-reversed image for terrestrial observing.

Optical design & connection

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Omegon Carbonline 2'', 90° SC mirror star diagonal, 99% dielectric
Omegon
Carbonline 2'', 90° SC mirror star diagonal, 99% dielectric
$ 199.00
ready for shipping in 24 h
Omegon 1.25", 90° Amici prism
Omegon
1.25", 90° Amici prism
( 5 / 5 )
$ 29.90
ready for shipping in 24 h
Omegon Carbonline 1.25'', 90° mirror star diagonal, 99% dielectric
Omegon
Carbonline 1.25'', 90° mirror star diagonal, 99% dielectric
$ 139.00
ready for shipping in 24 h
Omegon Star diagonal with 99% reflection, 2"
Omegon
Star diagonal with 99% reflection, 2"
( 5 / 5 )
$ 219.00
ready for shipping in 24 h
Omegon Carbonline 2", 90° mirror star diagonal, 99% dielectric
Omegon
Carbonline 2", 90° mirror star diagonal, 99% dielectric
$ 199.00
ready for shipping in 24 h
Omegon 45°, 1.25'' to 1.25'' Amici prism
Omegon
45°, 1.25'' to 1.25'' Amici prism
$ 99.00
ready for shipping in 24 h
Baader Diagonal mirror ClickLock 2"
Baader
Diagonal mirror ClickLock 2"
( 5 / 5 )
$ 323.00
ready for shipping in 1-2 weeks
Omegon Amici prism 90° 2"
Omegon
Amici prism 90° 2"
$ 196.96
Sale price:
$ 181.00
ready for shipping in 24 h
Omegon Mirror star diagonal, 90°, 1.25"
Omegon
Mirror star diagonal, 90°, 1.25"
$ 29.90
ready for shipping in 24 h
Omegon 1,25'' Amici Prism 90°
Omegon
1,25'' Amici Prism 90°
( 5 / 5 )
$ 169.00
ready for shipping in 24 h
Omegon Pro Penta Prisma 90° 1.25''
Omegon
Pro Penta Prisma 90° 1.25''
$ 239.00
ready for shipping in 24 h
Seben Zenitprisma 90° AP3 1,25''
Seben
Zenitprisma 90° AP3 1,25''
$ 12.90
ready for shipping in 24 h
Levenhuk Diagonal mirror Ra 90° 2"
Levenhuk
Diagonal mirror Ra 90° 2"
$ 250.00
ready for shipping in 24 h
Baader Zenith prism T-2/90 degree, 32mm
Baader
Zenith prism T-2/90 degree, 32mm
$ 148.00
ready for shipping in 1-2 weeks
Bresser Star diagonal 99 Percent Reflectivity 2"
Bresser
Star diagonal 99 Percent Reflectivity 2"
$ 86.00
ready for shipping in 24 h
William Optics Diagonal mirror Dura Bright 90° 2"
William Optics
Diagonal mirror Dura Bright 90° 2"
$ 250.00
ready for shipping in 24 h
Explore Scientific 3" 90° mirror star diagonal
Explore Scientific
3" 90° mirror star diagonal
$ 630.00
ready for shipping in 1-2 weeks
Omegon 1.25" 45° erecting prism
Omegon
1.25" 45° erecting prism
$ 44.90
ready for shipping in 24 h
Omegon 45°, 2'' to 1.25'' Amici prism
Omegon
45°, 2'' to 1.25'' Amici prism
$ 219.00
ready for shipping in 24 h
Baader 2" BBHS®-Click-Lock mirror star diagonal
Baader
2" BBHS®-Click-Lock mirror star diagonal
$ 530.00
ready for shipping in 1-2 weeks
Omegon 2'', 45° Amici prism
Omegon
2'', 45° Amici prism
$ 199.00
ready for shipping in 24 h
Auriga Diagonal mirror 90° 1.25"
Auriga
Diagonal mirror 90° 1.25"
( 5 / 5 )
$ 119.00
ready for shipping in 24 h
Skywatcher Amici prism 45° 1,25"
Skywatcher
Amici prism 45° 1,25"
$ 61.00
ready for shipping in 1-2 weeks
Omegon Pro 1.25'', 45° penta-prism
Omegon
Pro 1.25'', 45° penta-prism
$ 189.00
ready for shipping in 24 h
Celestron zenith prism 90°, 1.25"
Celestron
zenith prism 90°, 1.25"
( 5 / 5 )
$ 42.90
ready for shipping in 24 h
APM Diagonal prism with quick release 2"
APM
Diagonal prism with quick release 2"
$ 239.00
ready for shipping in 1-2 weeks
William Optics Dura Bright 1.25" 90° mirror star diagonal
William Optics
Dura Bright 1.25" 90° mirror star diagonal
$ 195.00
ready for shipping in 24 h
APM Star diagonal 99 Percent Reflectivity 2"
APM
Star diagonal 99 Percent Reflectivity 2"
$ 195.00
ready for shipping in 1-2 weeks
Baader Amici prism ClickLock BBHS® 90° 2"
Baader
Amici prism ClickLock BBHS® 90° 2"
$ 730.00
ready for shipping in 1-2 weeks
Skywatcher Amici prism 90° 1,25"
Skywatcher
Amici prism 90° 1,25"
$ 61.00
ready for shipping in 1-2 weeks
Bresser Amici prism 90° 1,25"
Bresser
Amici prism 90° 1,25"
$ 54.00
ready for shipping in 1-2 weeks
Baader Amici prism 90° 2"
Baader
Amici prism 90° 2"
$ 318.00
ready for shipping in 1-2 weeks
TeleVue Diagonal mirror Everbrite SC 90° 2"
TeleVue
Diagonal mirror Everbrite SC 90° 2"
RRP:  $ 730.00
Our price:
$ 609.00
ready for shipping in 6-10 weeks
TS Optics 1.25", mirror star diagonal for Imaging Star apochromats
TS Optics
1.25", mirror star diagonal for Imaging Star apochromats
$ 152.00
Sale price:
$ 108.82
ready for shipping in 24 h
Skywatcher Diagonal Mirror Deluxe 90° 2"
Skywatcher
Diagonal Mirror Deluxe 90° 2"
$ 192.00
ready for shipping in 1-2 weeks
Skywatcher Amici prism 45° 2"
Skywatcher
Amici prism 45° 2"
$ 202.00
ready for shipping in 1-2 weeks