4
Tuning:
Here is where the magic begins. On the filter is a small brass wheel recessed into the filter housing.
Move the knob all the way to the right when standing at the eyepiece end. Do not force the wheel. While looking
thru the instrument slowly move the wheel to the left. After about 4-5 turns you should have seen the edge detail
of the Sun come into view and then fade away again. Move the wheel back in the other direction until the
prominences are most vivid. Moving the wheel from here in either direction should have little visual effect on the
image but more or less surface detail may become apparent. Personal preference will specify where the tuning
point is dependant upon what you like to observe. Once tuned, there should be no reason to re-tune during an
observing session.
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.
Change the eyepiece:
When you have a good feel for observing at lower magnifications try to increase the
magnifications in small steps. Place an interesting artifact in the center of the field. Replace the 25mm with an 8 -
12mm eyepiece. Look thru the eyepiece and re-focus carefully. The image has dimmed slightly due to higher
magnification but the details should be easier to see. You can push the magnification as seeing conditions allow.
A few more definitions
Hydrogen-alpha:
The wavelength of light in the spectrum that these scopes allow you to look at. Centered at
656.28nm.
Bandwidth:
The width of light at a given wavelength that is allowed to pass. The LS60FHa is <0.7 Angstrom. As
bandwidth is reduced more surface detail of the Sun can be resolved. This can be accomplished thru double-
stacking with a second LS60FHa Filter (<0.5 Angstrom).
Angstrom:
The unit of measurement for light. 1 Angstrom = 0.1nm.
Etalon:
A resonating cavity produced thru the fabrication of highly precise optical surfaces.
Technical data
Filter aperture:
60mm
Bandwidth:
<0.7 Angstrom
Double stacked:
<0.5 Angstrom
Tuning:
tiltable Etalon
Housing diameter:
95mm
Length:
85mm
Front thread:
M90mm x 1mm female thread
Rear thread:
M90mm x 1mm male thread
Weight:
0.85kg
Lunt-Solar-Systems – Exclusive European Distributor
Bresser GmbH
Gutenbergstrasse 2, D-46414 Rhede, Germany
Phone: +49 (0) 2872 – 80 740
E-Mail: [email protected]
www.bresser.de
