----------------------------------- metalgibson 25 Iul 2016 22:37 ----------------------------------- Erwin Chitarile le fac de la zero ,folosesc lemn atit autohton cit si comandat de pe ebay din america (lemn copac rosu,negru,palisandru) si la fel electronica o comand Doar la chitara cea din dreapta,unde e desenat focul,electronica am facuto proprie "Pickup-doze electromagnetice" le-am facut din bobine de la un motor electric de 220v Chitara nr 1 : https://www.facebook.com/arche.jamestown/media_set?set=a.235248973171967.76651.100000605981195&type=3 https://www.youtube.com/watch?v=vjx3xy2Dsmw Chitara nr2: https://www.facebook.com/arche.jamestown/media_set?set=a.747352191961640.1073741826.100000605981195&type=3 Acum despre Ocular " Field of View: Apparent and True A telescope eyepiece's apparent field of view is the angular diameter, expressed in degrees (°), of the circle of light that the eye sees. It is similar to the screen of a television (not the actual picture seen on it). Most eyepieces have an apparent field of about 40° to 50°. Specialized wide-field telescope eyepieces can boast apparent fields ranging from 60° to 100° or more. Such wide-field and Ultra-Wide eyepieces are preferred by amateur astronomers who enjoy the "spaceship porthole" effect of using as wide a field as possible. The true field (or real field) of view is the area of sky seen through the eyepiece when it's attached to the telescope. The true field can be approximated using the formula: True Field = Apparent Field ? Magnification For example, suppose you have an 8" Cassegrain telescope with a 2000mm focal length, and a 20mm eyepiece with a 50° apparent field. The magnification would be 2000mm / 20mm = 100x. The true field would be 50 / 100, or 0.5° - about the same apparent diameter as the full Moon. For eyepieces of a given design (Kellner, Orthoscopic, Plossl...) the width of the field of view is generally inversely proportional to the magnification -- doubling the magnification cuts the field width in half. But at the same magnification, different eyepiece types have dramatically different fields of view -- expensive modern designs, like Naglers, may have twice as wide a field as such old standbys as Kellners and Orthoscopics. So if you want a wide field of view, perhaps for finding things or for looking at some of your favorite large objects, you must either get a long focal-length, low-magnification eyepiece, or spend some money for a fancy design, or both. There is a catch, too: There is no magic to getting a wide field of view in an eyepiece -- look down the barrel of a short focal-length, high-magnification eyepiece, and see how tiny the lenses are compared to those in a low-magnification eyepiece. Wide fields of view require wide lenses. But wide lenses won't do any good if the eyepiece barrel, or the focuser tube, or the baffle tube of a Schmidt-Cassegrain, prevents light from getting to their outer edges. For good use of a low-magnification, wide-field eyepiece design, it must be mounted in a large eyepiece barrel and used with a large-diameter focuser and baffle tube." Deci la coular acesta care l-am facut ATOV va fi: F telescopului 1000mm F ocularului 60mm Magnificare =1000/60=16.6x 4 cazuri: AFOV 50 grade ; AFOV 60 grade ;AFOV 70grade ;AFOV 80grade dupa presupunerea mea vizuala ocularul ar avea intre 70-80grade ATOV1=50/16.6=3.01grade de cer ATOV2=60/16.6=3.61 grade de cer ATOV3=70/16.6=4.21 grade de cer ATOV4=80/16.6=4.81grade de cer :D UN Televue Athos cu AFOV 110grade ce ATOV are? sau alte UWA Tele VUE ?