Lunt LS50THa B400PT H-alpha Solar Telescope
Lunt LS50THa B400PT H-alpha Solar TelescopeLunt LS50THa B400PT H-alpha Solar TelescopeLunt LS50THa B400PT H-alpha Solar Telescope

Lunt LS50THa B400PT H-alpha Solar Telescope

£1,413.00✓ 2 year warranty


Out of stock due 40-60 working days

About this product

Model:  lunt_LS50THaB400PT
Part Number:  0551154

This 50mm f/7 refractor-based Hydrogen-alpha telescope from Lunt provides an excellent introduction to solar observing in Ha or solar photography using a suitable imaging camera.

Features an internally mounted etalon with Pressure Tuner adjustment and a B400 blocking filter. The smaller B400 blocking filter is better suited for visual observing.

<0.75 Angstrom band pass!

Includes a clamshell with threaded holes for mounting.

Pressure Tuner

True Doppler Tuning (Pressure Tuning) allows for a shift into and away from the user, adding a 3D-like component to the viewing experience. While it has minimal effect on proms (due to them being at the edge of the disk) it does have an effect on filaments and active regions on the surface. While looking at a filament at the centre of the Sun the user has the ability to Doppler shift from the base of the filament to the tip, following the filament through it’s structure toward you and away from you, allowing for enhanced visual and imaging capability for the observer as well as a research tool for the avid hobbyist. The pressure tuning system provides an order of magnitude more precision to the tuning of the desired features.

Double Stacking

An optional matching LS50C compact double stack filter is also available which allows you to lower the bandpass to <0.5 Angstrom which gives much greater surface detail. The double stack filter is easy to fit - it simply screws directly on to the LS50THa.

The image above shows the Lunt LS50THa H-alpha Solar Telescope fitted with the optional matching LS50C compact double stack filter as well as the TeleVue Sol Searcher finder and Lunt eyepiece.

Telescope Field of View Simulator


TypeSingle Interference Etalon
TuningInternal Pressure Tune (Doppler True Tuning)
Focal Length350mm
F RatioF7
Bandpass<0.75 Angstroms @ 656nm
FocuserHelical Focuser
MountingIntegrated clamshell style with 1/4-20 tapped base
ColorPearl White with Black and Red accents
DiagonalB400 or B600 Blocking Filter

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Q1. What is the difference between the B400 blocking filter and the B600 blocking filter?

The B400 blocking filter is best for visual use. The B600 blocking filter has a larger field of view which is good for both visual and imaging.

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