The SolarMax 70 CaK telescope
is an excellent companion to Coronado's hydrogen alpha line of
filters and scopes. While not as dynamic as a Ha view, CaK does
show interesting phenomena both visually and photographically.
The "Calcium Network" is plainly visible and glows brightly
against the darker supergranuels. Active regions show up
better in this scope than with white light filters. Prominences
are visible in CaK light. The awe factor comes in when you
realize the scale of what you're looking at.
The difference between this
scope and the CaK PST is only the image scale. The views are the
same except the PST image is smaller and the details on the disk
are miniaturized.
Visibility
Because CaK emissions are
at the ultraviolet end of the spectrum, not everyone can see
them. Younger eyes have an easier time. As you age your eyes
yellow and tend to limit your view of the Calcium line. Don't
let this discourage you though! Try and take a look through a
CaK filter at a public event, vendor event or club star party
before you rule out purchasing one of these scopes. You might be
surprised.
Usability
The SM70 CaK telescope has
the same fine workmanship as other Coronado products. The
helical focuser has a firm feel and easily supports the weight
of eyepieces, barlows and cameras. Imaging can be accomplished
with a variety of platforms. The sliding diagonal allows you to
fine tune the view for just about any chip or lens. The blocking
filter supports only 1.25" accessories.
SM70CaK, ST-2000XM
CCD
Summery
Solid mechanics,
portability and ease of use make the SM70CaK an excellent choice
for the solar enthusiast. This scope helps to make the most of
the Solar Minimum and will be a star performer at the Maximum.
Update: the
Coronado SolarMax 70 CaK telescope was discontinued by Meade in
2007.
See the Resources section
for more info on Calcium K at
http://www.sungazer.net/cak/calciumk1.html
.
