page contents

AiryLab EdgeHD 800 HaT Solar Telescope System

AiryLab EdgeHD 800 HaT Solar Telescope System

In stock
can be shipped within 7-10 days

Price includes VAT, plus delivery

Airylab has taken Celestrons excellent value EdgeHD reflector and modified it for high resolution observation and imaging of the Sun’s chromosphere in the Hα band. Based upon Celestron’s proven EdgeHD 800, a specific dieletric coating is applied to the corrector plate so it becomes an Energy Rejection Filter (ERF). A specifically designed telecentric 2.7x amplifier is then added to the telescope to provide Fabry Perrot Hα etalons up to a 44mm in diameter (not included) with an ideal beam of parallel light. No other optical system is needed besides the telecentric amplifier.

Airylab’s HαT brings high resolution views to the Sun’s difficult to capture features such as spicules or details in prominences and inside the surface’s spots. A huge back focus range is possible from 100 to 250mm without impact on the optical performance. Thanks to the generous back focus, the HaT can be used with stacked etalons and also binoviewers without glass path correctors.

The HaT still retains all its ability in the normal visual range. For solar this means use with a White Light solar filter and also more classical applications such as high resolution planetary imaging or DSO. The only area not open to the HaT is solar observing or imaging in the calcium bands and also planetary imaging in the UV band. This is because the specially coated corrector plate blocks all harmful UV wavelength and thus prevents use in sub 400nm wavelengths.

HaT Quality

The Celestron telescopes used to build the HαT are measured at the 635nm wavelength on the professional optical testing platform of Airylab before and after the ERF coating. They are guaranteed to be better than L/4 in the red spectrum. Each telescope is delivered with a test report. The aplanetic design delivers a large corrected flat field that is very tolerant to alignment uncertainties. On the 203mm model the field is corrected for a 0,25° field radius which is Sun’s full disk size and the performance is diffraction limited over the full field of a large 32mm Solar Spectrum Advanced Observer / Research Grade etalon. Thanks to the ERF, the secondary mirror stays cool and its support is protected from the direct exposition to Sun’s light by a customized white plastic cap. The dielectric coating is hardened and can be easily cleansed the same way as for a non coated plate.

Ease of Use

Unlike conventional solar refractors that get big and clumsy above 150mm, the HαT is compact even at 280mm diameter. The small 203mm C8 based model can fit on a light Celestron VX or Skywatcher HEQ5 mount and shows a very stable alignment even after an extended ride in a car. The observation position on this short OTA is comfortable even when the sun is at the zenith. The closed tube design limits the heat exchange with the outside and the subsequent internal turbulence.


Before placing an order for an HaT, please contact us about lead times. The coating process for the corrector plate is specialised and done in batches. This means that there may be times when the HaT is not available from stock because a batch of correctors is having coating applied. In this instance there will be a delay while this happens and new scopes are built.


• Celestron 8" EdgeHD Optical Tube Assembly

• Aluminum Optical Tube

Celestron's premium StarBright XLT coatings

• 2032 mm focal length (f/10)

• 40 mm eyepiece included (51x)

• Visual back allows for use with 1.25" accessories

• 9x50 finderscope to help accurately find objects

• Star diagonal provides more comfortable viewing position when observing objects that are high in the sky

• Mirror Support Knobs hold the mirror in place and reduces image shift during imaging.

• Tube vents with integrated 60 micron mesh filter allowing hot air to be released from behind the primary mirror

• Fastar Compatible optical tubes are equipped with a removable secondary mirror for fast f/2 ccd imaging


OPTICAL DESIGN : Aplanatic Schmidt

APERTURE : 203.2 mm (8 in)

FOCAL LENGTH : 2032 mm (80 in)







OTA Length 17 in (431.8 mm)

OTA Weight  14 lb (6.35 kg)


Product Note Status Price
Celestron AVX EQ GoTo Mount and Tripod 14kg Load Celestron AVX EQ GoTo Mount and Tripod 14kg Load
£849.00 *
Celestron CGX-L EQ GoTo Mount 35kg (No Tripod) Celestron CGX-L EQ GoTo Mount 35kg (No Tripod)
£3,499.00 *
APM 80mm Finderscope Kit APM 80mm Finderscope Kit
£169.00 *
Celestron 8" Dovetail Celestron 8" Dovetail
£31.00 *
Prices includes VAT, plus delivery
Display accessory details

We also recommend

Prices includes VAT, plus delivery

Browse these categories as well: Schmidt Cassegrains, Solar Telescopes, High Resolution Solar Telescopes