Telescope-Service Star Diagonals

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Star Diagonals and Erecting Prisms

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1.25" Star Diagonals	1.25" Erecting Prism	2" Star Diagonal

1.25" Star diagonal Simple but good star diagonal prism or mirror for all refractors, Schmidt-Cassegrains and Maksutov-Cassegrains with a 1.25" eyepiece adaptor	1.25" Erecting Prism A simple but good erecting prism for terrestrial use. Can be used on all refractors, Schmidt-Cassegrains and Maksutov-Cassegrains with 1.25" eyepiece adaptor	2" Star Diagonal Mirror Another very popular 2" star diagonal mirror. Can be used on 2" focusers.
2" and SC Star Diagonals

High Quality Star Diagonal Mirrors 91% and 99% 2" star diagonal mirrors with excellent optical and mechanical quality

Other Brands (separate pages)
BAADER PLANETARIUM	Solar Prisms	Solar Prisms

Star Diagonals and Erecting Prisms: Baader T2 and 2" Star Diagonals. Zeiss prisms or Maxbright dielectrical mirrors	Baader Herrschel Prisms: Solar prisms for top contrast solar observing and imaging	Intes Micro Herrschel Prisms: Solar prisms for top contrast solar observing and imaging
William Optics Erecting Prisms	William Optics Star Diagonals	TEC Eyepiece Turret

2" and 1.25" Erecting Prisms: available in 45° and 90°. Very high optical and mechanical quality.	2" and 1.25" Dielectric Star Diagonals. Very high optical and mechanical quality.	TEC Eyepiece Turret: Switch between up to five eyepieces instantaneously.

1.25" diagonal mirror	Star diagonal prism 90° - 1.25" A very nice star diagonal prism with good multi-coating and approximately 91% reflectivity. 1.25" adaptation on both ends. Prices and availability: Please see our new Online Shop
	Star diagonal mirror 90° - 1.25" A low cost star diagonal mirror of reasonable optical quality and simply but well-working mechanics. It has a reflectivity of approximately 89% and has a protective coating. Prices and availability: Please see our new Online Shop

Please send requests or online orders to: sales@telescope-service.com

1.25" Erecting Prisms - 45° and 90°

1.25" Erecting Prism - 45°

1.25" Erecting Prism - 90°

Erecting prisms 45° and 90° - 1.25"

Erecting prisms are used for terrestrial observations with a telescope (they do not work with Newtonian telescopes). Without the prisms images will be upside-down and mirror-reversed. When using either the 90° or 45° erecting prism images will be terrestrially correct.

You can use the erecting prism with any telescope with 1.25" focuser, or with any telescope with a 2" focuser and a 1.25" adaptor. The only exception are Newtonian telescopes due to their narrow focal position.

We warmly recommend erecting prisms for terrestrial use. For astronomical use a normal star diagonal is the better choice.

Prices and availability: Please see our new Online Shop

Please send requests or online orders to: sales@telescope-service.com

2" Star Diagonal Mirror

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2" star diagonal with a massive all metal body

Star Diagonal Mirror 90° with 2" Barrel

This star diagonal mirror has a highly reflective mirror with a precise surface. It can be used on all telescopes with a 2" focuser and sufficient focus travel.

Contrary to many 2" diagonals there is no vignetting of the full 2" field.

The 2" barrel has a filter thread. Likewise, the 1.25" adaptor (always included) also has a 2" filter thread. This allows you to comfortably use your 2" filters on all 1.25" eyepieces without the hassle of unscrewing the filter all the time.

Prices and availability: Please see our new Online Shop

2" barrel with safety undercut

1.25" adaptor with safety undercut

Features of the 2" Star Diagonal Mirror

This diagonal mirror features a refreshingly massive mechanical design. Contrary to many cheap 2" diagonals the entire body is made of metal.

The 2" barrel has a safety undercut that prevents the mirror from falling out of the focuser by accident. Likewise, the 1.25" adaptor also has a safety undercut.

The 2" barrel has an integrated 2" filter thread. This allows you to use 2" filters in the diagonal (please note: If you use filters that far away from the eyepiece the filter surface must be exceptionally well polished, like our Baader filters.) You can also attach your 2" filters to the 1.25" adaptor, which has a filter thread as well. Please be careful: Some eyepieces have relatively long 1.25" barrels - they might damage the filters in this position if inserted carelessly!

Please send requests or online orders to: sales@telescope-service.com

High Quality 2" Star Diagonal Mirrors - Classical Coating and 99% DIELECTRIC Coating
We get our star diagonals directly from the factory. That way we can offer excellent quality diagonals at very low prices.

Dielectric star diagonal 2". The same diagonal is also available with SC thread instead of a 2" nosepiece.

TS ZS SC: Standard reflectivity star diagonal in the SC version.

The new TS 2" and SCT star diagonals offer an excellent mechanical and optical quality. We even offer a CNC machined dielectric diagonal.

- Reflectivity 91% in the standard star diagonal mirror or 99% reflectivity and dielectric coating in the Deluxe star diagonal mirror

- solid mechanics with all metal body

- brass compression rings both for 2" and 1.25"

- the barrel and the 1.25" adaptor both offer a 2" filter thread

- excellent surface quality - suitable even for superb telescopes

Prices and availability: Please see our new Online Shop

Please send requests or online orders to: sales@telescope-service.com

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