SolarSpectrum 0.7x Telecompressor 2"

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SolarSpectrum 0.7x Telecompressor 2"

# 2459259

€ 313.00 Price excl. German VAT tax (19%): € 263.03

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  • gets mounted eyepiece-sided directly onto the SolarSpectrum filter and reduces the previously by the telecentric system extended focal length again by a factor of 0.7
  • Working distance: 110mm (Distance to the camera sensor)
  • 2" male threads on both sides, fitting Universal Flange Adapter #2958240 (included with SolarSpectrum H-alpha filters
  • Telecompressor is used to adjust the focal length to possibly poor seeing conditions and / or enlarging the field for photographic- or webcam applications

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What is the ideal distance from the back of the 0.7x solar telecompressor lens to the face of the camera chip to give the 0.7x reducing factor? Thanks.
Question by: Mark Townley on May 21, 2017 9:44:17 AM | 1 Answer(s)

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Can the 0.7x and 0.4x solar telecompressors be used for calcium k line imaging?
Question by: John Candy on Mar 19, 2021 1:04:00 PM | 1 Answer(s)

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What are the threads on either side? Might it work with a Daystar quantum HA filter?
Question by: chris doole on Mar 21, 2021 7:37:00 PM | 1 Answer(s)

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Which way round should the 0.7x telecompressor go in the optical chain? i.e. which is the front and back of this optically and how would I know how to orientate it?
Question by: Mark Townley on May 14, 2017 11:06:00 AM | 1 Answer(s)

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Does the SolarSpectrum 0.7x is compatible with the Baader Sundancer 2 ?
Question by: Yvan Trembley on May 24, 2022 11:18:00 AM | 1 Answer(s)

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SolarSpectrum Telecompressors 0.4 / 0.7x

Suitable for all SolarSpectrum H-alpha Filters - with 2" male threads on both sides

SolarSpectrum Telekompressor 0.7fach
Telekompressor Kombination
Possible adaptations consisting of Baader T-Adapter, Zeiss T-2 changer system, T-2 Prism and Baader Eudiascopic eyepiece f = 30 mm

Solar Spectrum H-alpha filters require parallel light with a ray path of at least f/30. This is achieved by a focal length with our telecentric systems (and possibly also by dimming the lens with the iris). Because of the focal length extension in many telescopes the sun is not completely visually apparent when using eyepieces with f = 30 to 35 mm.

Both Solar Spectrum Telecompressors are mounted eyepiece-sided directly on the filter and reduce the previously extended focal length again by a factor of 0.4x (#2459260) respectively 0.7x (#2459259) with the result that now the whole solar disk with prominences is visible again.

A telecompressor is used to adjust the focal length to possibly poor seeing conditions and / or enlarging the field for photographic- or webcam applications.

Befestigung des Telekompressors

To attach the telecompressor use our 2″ Universal flange (# 295 8240); it gets attached with four screws directly onto the filter housing (see illustration), the telecompressor is mounted directly into the 2″ thread of the universal flange. The main thread of the compressor also is a 2″ male thread. This can be changed if necessary with parts from our T-2 accessories system either to a T-2 internal or external thread.

Vergleich Sonnensahpleylinse
Vergleich Solarspectrum Telekompressor

Application examples of the 0.7x Telecompressor:

The picture shows one possible combination, consisting of Baader T-Adapter (BTA # 240 8160 Part 21), Zeiss T-2 exchange system consisting of changer and change ring (# 245 6321 Part 6 and Part 7), one of our T-2 prisms and a Baader Eudiascopic eyepiece f = 30 mm.

The astro-images show the effectivness and the enlarging of the field of view with the 0.7x solar spectrum telecompressor on a 6 “refractor at f = 2250mm, dimmed down to 75mm, thus at f/30. The comparisons show the operation of the SolarSpectrum telecompressor. Primary focal length of the photographing lens is 2250 mm, reduced to 1700mm telephoto compressor The advantages: significantly larger field of view and reduce of the necessary exposure times!

Vergleich Solarspectrum Telekompressor
Shapleylinse T-2 Verlängerung
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Additional Information

Manufacturer Baader Planetarium
SKU (#) 2459259
EAN Code 4047825008671
Net weight (kg) 0.10

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