Classic Cassegrain telescopes

Despite of their previous popularity the Cassegrain telescopes are not so familiar today, but the small central obstruction and chromatic aberration-free view make them comparable to some APO refractors

Product variants

  • GSO 6" F/12 M-CRF Classic Cassegrain OTA (154/1848)

    GSO 6" F/12 M-CRF Classic Cassegrain OTA (154/1848) (GSCC6)

    incl. 27% VAT

    400.00 €
    Including 27% VAT:
    400.00 € (128 000 HUF)
    Net price (for non-EU customers):
    314.96 € (100 787 HUF)
    Add to basket Add to basket
    Stock avalability
    Budapest shop:
    Limited stock (1 piece). Please contact our colleagues before ordering: +36-1-202-5651
    Delivery:
    Delivery in 24-48 hours
    Bp. shop:Limited stock
    Delivery:Delivery in 24-48 hours
  • GSO 8" F/12 M-CRF Classic Cassegrain OTA (203/2436)

    GSO 8" F/12 M-CRF Classic Cassegrain OTA (203/2436) (GSCC8)

    incl. 27% VAT

    993.75 €
    Including 27% VAT:
    993.75 € (318 000 HUF)
    Net price (for non-EU customers):
    782.48 € (250 394 HUF)
    Add to basket Add to basket
    Stock avalability
    Budapest shop:
    Stock refill in progress (currently not in stock)
    Delivery:
    Delivery in 24-48 hours
    Bp. shop:Stock refill in progress
    Delivery:Delivery in 24-48 hours

More about the product

Cassegrain telescopes are used since the 17th century. The design makes long focal length and high magnification: ideal for Sun, Moon, planets, planetary nebula and double star observation. No glass corrector plate means no chromatic aberration and fast temperature equalization and resistance to dew formation. Hyperbolic secondary mirror and parabolic primary mirror made of Quartz glass for stable focus position. 99% reflection on primary and secondary mirror for an even brighter image. Despite its long focal length, the optical tube of this telescope is just 437 mm (for 6") and 536 mm (for 8") long, not including the focusers.

There is a 2" dual-speed Crayford focuser at the end of the tube, so image shift is eliminated. The  illuminated image field has 40 mm and 45 mm diameter. An additonal correction lens isn´t needed, because the image field is well corrected up to APS-C sensor format.

Waresz's opinion

After a few weeks, months of usage

Optical quality

Mechanical quality

Price/Value ratio

GSO 6" F/12 M-CRF Classic Cassegrain OTA (154/1848)
GSO 6" F/12 M-CRF Classic Cassegrain OTA (154/1848)
Pros

A mikrofókuszos crayford olyan magas színvonalú részlet, amit ebben az árkategóriában kizárt hogy máshol megtalálna az ember. Néztem a skywatcher féle crayfordot, sehol sincs ehhez. Az egész tubus igényes kidolgozású, a képalkotás nagyon jó.

Cons

A központi kitakarása nagy, és emiatt kisebb nagyításokat nem kell vele erőltetni. Kis fényerejű távcső, de ilyen fokusztávval nincsenek csodák.

Summary

A guan sheng felirat nagyon távolkeleti benyomást kelt, meg a szaga is, de ez ne riasszon senkit, kívül-belül kiváló a minőség. Okulárból 7mm-től 35mm-ig érdemes válogatni hozzá. 35mm felettiek már foltosak a kép közepén. Elvileg létezhet az az ég, amin 6mm is jó lehet, de én még olyat eddig nem láttam. Mivel a fényerő nem valami nagy, így kevesebb lencséből álló okulárok nagyobb örömöt okoznak. Pl apex sorozat.

Csuti István's opinion

Results of the first test

Optical quality

Mechanical quality

Price/Value ratio

GSO 6" F/12 M-CRF Classic Cassegrain OTA (154/1848)
GSO 6" F/12 M-CRF Classic Cassegrain OTA (154/1848)
Pros

Kompakt méret, könnyű hordozhatóság, nagyon jó ár/érték arány.

Cons

Nem tapasztaltam ilyet.

Summary

Egy hete vásároltam a tubust, és az első két teszt alapján nagyon elégedett vagyok vele. A mechanikai szerelés nagyon masszív, az optikai teljesítmény is nagyon meggyőző. Mivel leginkább a kompaktabb, kisebb méretű objektumokat részesítem előnyben, ez a szerelés nekem ideális. Bár a 154mm-es tubus látómezeje kb. 1,5 fok, így nagyobb kiterjedésű objektumokat is lehet vele nézegetni. Bátran merem ajánlani annak, aki ilyen távcsövön gondolkodik.

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The product comes with 1 year warranty.

Astronomical telescopes up to 100 Euros
Astronomical telescopes between 100 and 200 Euros
Microscope offer up to 200 Euros



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