cylinder body. Unscrew the black handle completely from the brass body. Simply removing the black handle
from the brass cylinder resets the system. No other disassembly is required. There may be some resistance
and a faint pop as the air enters the cylinder. This is normal. This has reset the system for your altitude.
Carefully re-thread the handle onto the body and engage the threads about one turn. While looking thru the
eyepiece gently turn the black handle onto the cylinder body. There will be little resistance at first, but as the
pressure in the cylinder builds the resistance will increase slightly. As you turn the cylinder you should see
features come into view thru the eyepiece. Continued turning will result in the wavelength shifting thru
656.28nm and detail will begin to disappear. Fine-tune the cylinder for the best view.
A few details regarding the pressure tune system. The amount of pressure being supplied to the etalon cavity is
minimal. It is the equivalent of going from -500ft below sea level to about 10,000ft. Or a few PSI. There is NO
risk of explosion. We are dealing with only a fraction of 1 atmosphere. When not in use we recommend that
you release the pressure by simply backing off the black handle from the cylinder body. If the system unthreads
completely, simply thread it back on 1 turn. It may not necessary to re-set the system every time it is used. Re-
setting may only be required if the system has been sitting for a long period of time.
Re-Focus. When you feel you have tuned effectively, re-focus the telescope. The finer details should come into
view. Try to relax the eye while observing and let the details come to you.
Note where the LS100THa/PT has tuned on the brass cylinder. I general count the remaining treads or
measure the remaining gap.
The installation of the DSII module is accomplished by first removing the focuser and extension tube from the
back of the OTA. This can be done by removing the 3 allen head screws that are recessed in the rear cone
assembly. The allen wrench was provided with the DSII. Make sure you have a firm grip on the focuser when
loosening the screws. These screws can be replaced with the 3 thumbscrews provided with the DSII.
The DSII can be placed into the rear of the LS100T OTA. The user may rotate the DSII into any position. Snug
the silver thumbscrews onto the module and fix in place.
If the user does not have an addition focuser for the DSII the focuser that was removed from the LS100THa/PT
can be used.
Re-install the blocking filter and eyepiece.
Refocus the system. The user may need to pull the blocking filter out of the focuser approx. 50mm to achieve
focus.
Tuning of the DSII is accomplished by first re-setting the PT cylinder as described above. The user will note
that the image will appear very dim when the DSII is not on band. Turn the PT cylinder on the DSII in while
looking thru the scope, the user should see the image brighten as the system comes on band. Adjust the DSII
pressure tuner for the best view of surface detail.
The user may now adjust the pressure tuner on the LS100THa/PT for maximum contrast.
The DSII utilizes a unique optical design that works to narrow the band pass while also removing the back-ghosting that
would normally occur with 2 highly reflective etalons sitting in such close proximity to one another. This ghost removal would
typically be done by tilting one of the etalons with respect to the other. The optical design works to move the “ghost” images
to an area outside the normal field of view. However, users who have low magnification eyepieces (~25mm), or eyepieces
with a wide field of view may notice this “halo”. Increasing the magnification or using an eyepiece with a narrower field of
view will reduce this effect. While we strive to provide perfect anti-reflection coatings at the Hydrogen-alpha line the residual
reflections are reduced to 0.1%. Therefore, not all back scatter can be totally removed. Less than perfect seeing conditions
will work to increase the background haze of the system in DS mode.
The DSII is designed to provide an enhanced, narrowband, higher contrast view of the Sun’s surface. The user will note a
dimming of the edge detail while using the scope in the DS mode.
Visit our website at
www.luntsolarsystems.com
for tips and insight on how you can get more out of your Solar Telescope.
Topics that will soon be covered include:
Imaging: Just how does one go about taking a picture?
Double-stacking: You'll hear a lot about the advantages of double-stacking your system.
Contrast Enhancement: Tips on how to fine tune your system for maximum contrast and resolution.
Future Accessories and Upgrades.
Lunt Solar Systems * 2520 N. Coyote Dr. #111 Tucson, AZ 85745 * (520) 344-7348
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