A much more comfortable observing position can be achieved with a refractor or catadioptric telescope by using an erecting lens. The beam of light exiting the telescope is deflected by 90° before it enters the eyepiece. In this way, even objects close to the zenith can be observed comfortably.
Omegon
1.25" 45° erecting prism
$ 44.90
ready for shipping in 24
h
Omegon
45°, 1.25'' to 1.25'' Amici prism
$ 99.00
Product can be shipped as of 01.08.2025
Omegon
2'', 45° Amici prism
$ 199.00
ready for shipping in 24
h
Omegon
45°, 2'' to 1.25'' Amici prism
$ 219.00
ready for shipping in 24
h
Celestron
Amici prism 45°, 1.25''
$ 58.00
ready for shipping in 24
h
Skywatcher
Amici prism 45° 1,25"
$ 66.00
ready for shipping in 1-2
weeks
Baader
Amici prism 1.25" 45°
$ 99.00
ready for shipping in 24
h
Bresser
Amici Prisma 45° 1.25''
$ 58.00
ready for shipping in 24
h
William Optics
1,25'' 45° Amici prism on 1,25''
$ 163.00
ready for shipping in 3-5
weeks
Baader
Planetarium 45° Amici prism, SC to 2"
$ 280.00
ready for shipping in 1-2
weeks
Skywatcher
Amici prism 45° 2"
$ 217.00
ready for shipping in 1-2
weeks
Skywatcher
Amici prism 45° 2"
$ 140.00
ready for shipping in 1-2
weeks
Baader
45° picture-putting up AmiciPrisma for Maxbright binocular
$ 111.00
ready for shipping in 1-2
weeks
Erecting lenses are available as zenith mirrors, zenith prisms or Amici prisms. The latter are useful for terrestrial observation and are therefore also available with a flatter deflection angle of 45°.
- Without an erecting lens, the image in the telescope depicts north below and east to the right.
- With zenith mirrors and zenith prisms, the telescope depicts a laterally transposed image: north is at the top, east is at the right and, without tracking, stars wander to the left.
- Amici prisms show a correct image as it would be seen with the naked eye. Therefore, these prisms are essential for nature-watching. However, their more complicated construction makes them susceptible to image defects, which is why the laterally transposed image is preferred in astronomy.
Most erecting lenses have simple plug-in connectors, as is common seen with eyepieces. For SC telescopes, however, there are also models with screw threads.