{"id":63,"date":"2012-08-23T19:48:13","date_gmt":"2012-08-23T19:48:13","guid":{"rendered":"http:\/\/camerapedia.ro\/?p=63"},"modified":"2012-08-23T19:48:13","modified_gmt":"2012-08-23T19:48:13","slug":"telemetrul-rangefinder","status":"publish","type":"post","link":"https:\/\/juverdeanu.ro\/blog\/telemetrul-rangefinder","title":{"rendered":"Telemetrul (Rangefinder)"},"content":{"rendered":"<p><a title=\"Voigtl\u00e4nder Rangefinder Accessory by Capt Kodak, on Flickr\" href=\"http:\/\/www.flickr.com\/photos\/captkodak\/272750793\/\"><img loading=\"lazy\" src=\"http:\/\/farm1.staticflickr.com\/92\/272750793_24f344bc6c_m.jpg\" alt=\"Voigtl\u00e4nder Rangefinder Accessory\" width=\"240\" height=\"169\" align=\"left\" \/><\/a>Un <strong>telemetru<\/strong> optic este un dispozitiv care m\u0103soar\u0103 distan\u021ba, de obicei folosit \u00een fotografie ca un ajutor pentru focalizare. Camerele echipate cu acest dispozitiv se numesc camere cu telemetru (ragefinder cameras). Sunt dou\u0103 tipuri de telemetre: <strong>telemetrul cuplat<\/strong>, care este conectat la inelul de distan\u021b\u0103 al obiectivului \u0219i te las\u0103 s\u0103 focalizezi un subiect prin folosirea acestuia, \u00een timp ce <strong>telemetrul necuplat<\/strong> \u00ee\u021bi permite s\u0103 m\u0103sori distan\u021ba dintre tine \u0219i subiect. Focalizarea se face, apoi, manual. Telemetrele necuplate pot fi folosite pe orice aparat cu obiectiv care permite focalizarea.<\/p>\n<p>Dispozitivele pentru desp\u0103r\u021birea imaginii (split-image), des \u00eent\u00e2lnite \u00een ecranele de focalizare SLR, pot fi numite \u0219i telemetre. Mai exist\u0103 \u0219i alte dispozitive pentru m\u0103surarea distan\u021bei de focalizare. Acestea sunt folosite \u00een camere cu focalizare automat\u0103 (autofocus), prin folosirea luminii infraro\u0219ie sau, ocazional, a onsarului. Aceste dispozitive nu se pot numi telemetre.<\/p>\n<h3>Func\u021bionarea<\/h3>\n<p><a href=\"http:\/\/camerapedia.ro\/wp-content\/uploads\/2012\/08\/327904794_c8454dc23d1.jpg\"><img loading=\"lazy\" class=\"size-medium wp-image-64 alignright\" title=\"327904794_c8454dc23d[1]\" src=\"http:\/\/camerapedia.ro\/wp-content\/uploads\/2012\/08\/327904794_c8454dc23d1-300x196.jpg\" alt=\"\" width=\"300\" height=\"196\" \/><\/a>Telemetrul din imaginea al\u0103turat\u0103 ne arat\u0103 cum se folose\u0219te; telemetrul este un dispozitiv de ocalizare concomitent\u0103, care afi\u0219eaz\u0103 dou\u0103 imagini diferite. Imaginea principal\u0103 este cadrul \u00eentreg al telemetrului, \u00een timp ce a doua imagine este un punct mic \u00een centrul cadrului. Pentru a focaliza un subiect, trebuie s\u0103 \u021bii punctul pe acel subiect. Prin ajustarea focaliz\u0103rii, vei mi\u0219ca imaginea secundar\u0103 pe orizontal\u0103 p\u00e2n\u0103 c\u00e2nd aceasta se va alinia cu imaginea principal\u0103. La acest punct, telemetrul (la fel \u0219i obiectivul, dac\u0103 este cuplat) va focaliza subiectul selectat. Acest tip de telemetru se mai nume\u0219te \u0219i un dispozitiv de focalizare coincident\u0103.<\/p>\n<p>\u00cen exemplul nostru, imaginea deschis\u0103 din mijloc ne arat\u0103 antena dublat\u0103. Asta indic\u0103 faptul c\u0103 trebuie modificat\u0103 distan\u021ba pentru a ob\u021bine o imagine clar\u0103 a acelei antene. C\u00e2nd antena este \u00een planul clar, telemetrul o arat\u0103 o singur\u0103 dat\u0103.<\/p>\n<p>Unele camere foto electronice mai noi, cum ar fi Contax G2, folosesc telemetre ca parte a mecanismului de autofocalizare.<\/p>\n<h3>Construc\u021bia<\/h3>\n<p><a title=\"CoupledRangefinder by ILike2BeAnonymous, on Flickr\" href=\"http:\/\/www.flickr.com\/photos\/10025600@N00\/105571617\/\"><img loading=\"lazy\" src=\"http:\/\/farm1.staticflickr.com\/43\/105571617_6ba4bcce48_m.jpg\" alt=\"CoupledRangefinder\" width=\"214\" height=\"189\" align=\"left\" \/><\/a>Telemetrul func\u021bioneaz\u0103 prin combinarea a dou\u0103 imagini, prin dou\u0103 ferestre, \u00een imaginea pe care o vezi. Lumina p\u0103trunde printr-un beamsplit\u0103r (desp\u0103r\u021bitor pentru lumin\u0103). Lumina din fereastra a doua este canalizat\u0103 pritr-o oglind\u0103 sau lentil\u0103 care o rote\u0219te \u00een func\u021bie de setarea telemetrului. Asta cauzeaz\u0103 mi\u0219carea imaginii din vizorul al doilea al\u0103turi de controlul distan\u021bei.<\/p>\n<h3>Acurate\u021bea<\/h3>\n<p>Telemetrele sunt dispozitive de focalizare foarte precise pentru distan\u021be scurte. Pentru o camer\u0103 cu telemetru, precizia pentru 10-15m este mai mare dec\u00e2t lentila de la un SLR. Acurate\u021bea depinde efectiv de baza telemetrului &#8211; distan\u021ba dintre fereastrele de vizualizare \u00eenmul\u021bit\u0103 cu amplificarea vizorului.<\/p>\n<p>Telemetrele nu sunt foarte precise pentru obiective telefoto deoarce acestea sunt mult mai sensibile la focalizarea pe distan\u021be lungi.<\/p>\n<p><a href=\"http:\/\/www.flickr.com\/photos\/ishoothorizon\/3841803283\/\" title=\"Zeiss Ikon Nettar by ishoothorizon, on Flickr\"><img loading=\"lazy\" src=\"http:\/\/farm4.staticflickr.com\/3476\/3841803283_745587bca0_m.jpg\" width=\"218\" height=\"240\" alt=\"Zeiss Ikon Nettar\"><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Un telemetru optic este un dispozitiv care m\u0103soar\u0103 distan\u021ba, de obicei folosit \u00een fotografie ca un ajutor pentru focalizare. Camerele echipate cu acest dispozitiv se numesc camere cu telemetru (ragefinder cameras). Sunt dou\u0103 tipuri de telemetre: telemetrul cuplat, care este conectat la inelul de distan\u021b\u0103 al obiectivului \u0219i te las\u0103 s\u0103 focalizezi un subiect prin&hellip; <a class=\"more-link\" href=\"https:\/\/juverdeanu.ro\/blog\/telemetrul-rangefinder\">Continu\u0103 lectura <span class=\"screen-reader-text\">Telemetrul (Rangefinder)<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[2093],"tags":[2143,2144,2145,2146],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Telemetrul (Rangefinder) - Camerapedia<\/title>\n<meta name=\"description\" content=\"Telemetrul optic este un dispozitiv care m\u0103soar\u0103 distan\u021ba, de obicei folosit \u00een fotografie ca un ajutor pentru focalizare.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/juverdeanu.ro\/blog\/telemetrul-rangefinder\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Telemetrul (Rangefinder) - 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