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Strumenti in uso

several months using an optical telescope with the Meade ACF. The instrument is a GPS mount SC A / Z equipped with wheels for easy movement, since the total weight exceeding 40 kg

You can see the changes I made as I had to reduce the minimum height of the instrument from the ground to reduce the width of the legs and then facilitate the exit and entry of the same room on the top floor of a building, where the horizon is esssere free to 360 degrees. The amendment to the original tripod, which in the photo are visible signs of the welds made clear, however, did not lead to stability problems, even in the presence of air. The wheels are locking in order to promote greater stability.

The mount A / Z, at least for now, is preferred and used over that polar, because of the problems outlined above. The use of a polar mount with widths available could only jeopardize the stability, with great disadvantages in the use of instrumentation. In the picture is also visible in the lower left portion of the platform that allows the escape from the small room where the telescope is housed when not in use.
In order to improve environmental conditions, during the "rest "instrument, it was decided to use a cover sheet that prevents condensation forms and free of dust. While in summer conditions, when normally the temperatures during the day can exceed i 30°/31°, un piccolo sistema refrigerante, mantiene all'interno della struttura, una temperatura intorno ai 27°/28°.
Alcuni dati tecnici sul telescopio sono indicati in tabella. Particolare interessante è il completo automatismo nel settaggio dell'ora e delle coordinate geografiche, grazie al sistema GPS a 16 canali, l'allineamento al polo, ed il livellamento per individuare il piano virtuale su cui effettuare la calibrazione dell'orientamento rispetto a due stelle di riferimento. Le operazioni sono svolte in autonomia e richiedono 4/5 minuti, e nel caso di postazione mobile, come nel mio caso, vanno ripetute ad ogni sessione osservativa. L'allineamento risulta essere abbastanza precise, improved with a "running" of the motors on both axes, which can be done at the discretion, when deemed appropriate, on fixed targets during the day.
In any case, from my tests, I could check whether the instrument has been "run in" properly resulting in automatic alignment, using its focal 2500 mm, a 9 mm eyepiece., a shooting which the CCD DSI PRO II, the object seen in the eyepiece field will also be displayed in the field of the CCD on the PC screen.

A feature that I found very helpful is the "High Precision". In fact, in the case of faint objects, not always you are sure you have correctly pointed at the target, and in such situations this function works as follows. The telescope, "identifies" an optically visible star near the celestial body that we are aiming for and invites us to perfectly centered in the visual field, and after our confirmation, the telescope moves slowly toward the object's coordinates, a beep warns us when the procedure was completed. At this point we can begin to resume our CCD. The field of view from the sensor's DSI II Pro, for a focal length of 2500 mm. reported to be 8.89 '(h) x 6.64' (w).

Some accessories have proved useful in the use of the instrument:

1) pipe hood, which in addition to prevent harmful reflections in the shot, does not allow condensation on the corrector plate and consequent fogging, at least in average moisture conditions, no saturation.

2) use of a filter in broadband, in order to reduce the brightness of the background sky, and limit the spread of public light.

successfully used, Baader Sky Glow Filter.

3) power supply.

4) Hartmann mask.

5) electric focuser.

An example of recovery, is the moon following image: 30/06/2009 20:17:04 UT F = 2500 mm. F10, IR_CUT + Sky Glow filter, CCD-TEMP 27.5 °, sum of 55 images with total time of 0.22 sec.