Although the PST is an
excellent
solar telescope, (having in attention the relation price/quality)
for H-Alpha observation,
in special for proeminences, with a little more expense
(and a little ATM work ) it can
be much better used.
The following images, are clear,
but I must relate that the substitution of the original objective
by another one, cannot (nor must)
be made of light spirit.
It is indispensable to not only
guarantee the continuity of the integrity of the filter, as also the
security
in the visual observation. Of the done analysis to the original
objective,
I concluded that this only leaves to pass cold light and only the
visible
band in the H-Alpha zone.
Exactly without having been able
to confirm, I believe that also the UV must be blocked.
So that these conditions if keep,
one will have installing in the place of the objective, two filters:
a : - Filter cut-of UV/IR.
b : - Filter H-Alpha pass-band
of 50 nm (or less).
It is also basic to have in
account
the relation F/D of the original objective: F = 10
(40/400).
Small variations for a "higher
F" (F=10,5 .... F = 11) do not degrade the quality of the image.
Variations for a "smal F" than
F=10 are not advisable and must be prevented.
Thus, two versions had been home
made:
a - 70 / 700 mm with a
normal
acromatic lens .
b - 115 / 1200 mm (F =
~10,5)
my " Solaris 1" refractor.
The exchange from "a"
to "b" becomes in few minutes, good as well as the replacement
of original objective, in order
that it is always possible to make use of the PST in the origin version
.
I must still relate that
my version does not transform a PST into a SolarMax.
It remains, as it is obvious, to
be an equipment particularly useful for the proeminences and other
phenomenons
that occur in the solar limb, and one did not observe in white light.
But the exchange of the original
objective by another of bigger aperture and focal distance, is
expressed on sensible improvement in terms of resolution of details,
thus allowing
a good better exploitation of the filters of the PST.
Any questions, e-mail :
alcaria.rego@sapo.pt
You are invited to visit the
main
page of Solaris