Lunt Solar Systems - 200mm Ha Telescope w/ Internal Etalon and B1800

Ha Double Pass Internal 50mm Etalon System Newtonian Telescope with rings, with a 200mm aperture.
An internal etalon with tune adjustment allows for a <0.55 Angstrom bandpass. Coarse focus
adjustment via a slide tube. Fine adjustment is achieved with a dual speed Crayford style focuser
with 10:1 reduction standard.  

A 200mm aperture Newtonian Reflector Telescope with a patent pending etalon assembly.

Now you can put >24,000 square millimeters of solar power to work! That’s almost 4X a 100mm
System!

Specifications:

• Aperture:  200mm High Quality Mirror
• Focal Length:  1600mm Effective
• Band Pass:  <0.55 Angstroms RMS
• Focuser:  Precision Crayford style with 10:1 included
• Color:  Pearl White Body with Black Anodize Accents


The Double Pass System...

The best views of the Sun are undoubtedly seen thru a dual etalon system. The reduction in
bandpass from an estimated 0.8 Angstroms to 0.5 Angstroms just seem to bring the Sun’s surface to
life. Larger apertures on a good seeing day usually result in a WOW! from those who are lucky
enough. Adding a second etalon to an existing etalon is not quite as simple as it may seem. Both
etalons need to be brought on line (tuned) and both need to be tiltable such that all ghosts are
eliminated. Ideally the transmission curves should overlap perfectly when on band to provide for
the best possible resolution and contrast. Lunt Solar has engineered a system that takes into
account all these issues. The light from the primary mirror is passed thru the same etalon twice.
Given that the etalon is tuned on band for the first pass it is, by default, on band for the
second pass and is a perfect match to itself. The loss of transmission due to the beamsplitting
or doublestacking is more than made up for with the increase in aperture.

Although the LS200T utilizes a 200mm F6 mirror the collimating set have been optimized to both
increase the effective focal length to F8 allowing for a minimized central obstruction at the
secondary and to assure elimination of abberations at the desired wavelengths.

In addition to the Patent Pending optical design Lunt Solar has taken additional steps to ensure
that this will be a scope on everyone’s wish list this year.

• An infra red reflecting window (ERF) is provided early in the optical path to remove unwanted
heat from the system.

• An optically optimized collimating system ensures true collimation, coma correction, and off
axis (sweet spot) reduction.

• Our newly designed Induced Transmission Filter (previous post) will ensure long term safety and
performance.

• Focus is achieved with a high precision Crayford style focuser with a 10:1 reduction included.

The system has an estimated bandpass of <0.55 Angstroms and is capable to providing ultra high
resolution and high contrast views of both surface and edge detail under good to excellent seeing
conditions.

Now that Solar Minimum is finally behind us, we can look forward to a new and exciting Sun with
our new and exciting products.

The LS200 will soon be available with the CaK secondary option.
This option will have a second focus system 180 degrees from the Ha. This system will house CaK
filter optics. This allows for simultaneous viewing of the Sun in both Ha and CaK thru the same
telescope.