It incorporates in a single system a 40mm f/10 refractor and a system of filters for solar observation.|
I bought it used in 2004, my model was bought in Anacortes in October 2003.
Put it simply, this model it's neither professional nor exceptional (if not from the quality/price perspective), but it gives great satisfaction, especially when we take its usability into consideration.
I personally keep it inside permanently mounted on the alta-azimuthal head of my Manfrotto tripod, with Swarowsky ocular zoom 7-24 (in the photo); I believe this is the optimal configuration. This choice allows me to have a quick look at the sky in the morning before going to work since it's always operational.
Personally I never had previous experiences of continuous solar observation, and as such, maybe naively, I was struck by the rapid changes that happen on our star, making it thus ever interesting to observe.
The observation through this instrument it's not simple because the BF filter, immediately before the eye-piece (oculare), it's only a few millimeters, reducing thus the usable field-of-view. This means that the "out of axes" of the eye relative to the eye-piece it's limited and it's more relevant in eye-piece with wide field-of-view.
This instrument it's definitely non conventional and it adopts clever and innovative ideas.
With a hex wrench let's start our surgical intervention...
One of the first things that comes to the attention is the focusing element (focheggiatore), this is inside the "maxic-box", and it works by translating the prism, that works as a diagonal piece, along the bisecting axes between the primary lens and the eye-piece (shown in figure by a white arrow).
The other novelty is the solar-finder (cercatore solare), based on the principle of the stenopeic hole, also inside the "maxic-box", as it is shown in figure. It projects an image on a opaque glass mounted on the top of the instrument (in the drawing, following the yellow line, the sun comes from the left and it is then deflected on the opaque glass on the top). This is a really clever idea, how many times have I blinded myself trying to find the sun, … I knew that it was there and easy to see … but not so much to center on it as I thought.
We are finally arrived at the heart of the PST that is the interferential filter Fabry-Perot Etalon. The PST can tune the filter by the rotation of the "tilting" element, an aluminum grid covered in textured rubber. This way it is possible to tune the filter on the "correct" frequency, and mechanically the effect is that of translating one of the two filter components, and to compress or relax the orange elastic seal in between the two filters.My model, right from the moment I purchased it, suffered from a mounting problem, since the correct tuning would happen at the end of the range, not allowing me to set it up as wished. Taking it apart, I realized that the external grid, that covered with the textured rubber, acts upon the aluminum grid of the tilting element through a 2mm screw that can be positioned in any of the 12 threaded holes positioned like the hours in a watch.
It is then simple to better regulate proceeding in the following manner:
First, observing the sun, one should move the tilting in the best position that's allowed by the instrument.
The focusing on the PST is designed for visual observation, allowing it to be coupled with an eye-piece or a Barlow + eye-piece. I don't consider the eye-piece holder to be the focusing element, since the focusing works as previously explained. The eye-piece holder actually consists of two parts. The first is simply a male-female aluminum connector used to set the final filter at the correct distance; the second incorporates the BF filter, and the nylon knob used to fix the eye-piece..
Copyright © 2003 Glauco Uri