[AZ-Observing] Re: Sunspot Group Near Meridian
- From: Tom Polakis <polakis@xxxxxxxx>
- To: az-observing@xxxxxxxxxxxxx
- Date: Mon, 13 Aug 2001 11:19:29 -0700
At Monday, 13 August 2001, Bob Goff wrote:
>I tend to prefer full aperture solar Objective singlet of 10 or
more inches
>of the plano convev aspheric variety working at f/20 or greater
followed by
>a heat rejection filter, tilted at about 10 degrees, then a variable
field
>mask to reject unnecessary heat, then an RG-610 filter for blocking,
then a
>Schneider Companon enlarging lensthat may be set to any conjugate one
>chooses, finally followed by a Lyot-Ohman universally tuneable filter
as
>described in _Applied_Optics_ in '71 or '72 and either an eyepiece
or some
>SO film that is a relative of microfile filn and really sensitive
to the
>red end of the spectrum.
Can I get one of them at Starizona for $30?
>After about 10,000 hours of Solar observing, I have found that generally
>the images deteriorate greatly after about 10 in the morning.
I have heard Paul Maxson say the same thing. The bad news, then,
is that during the season in low-desert Arizona when it is actually
comfortable to be out in the sun, we're stuck with observing it when
it is at a low altitude.
Tom
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