-----------------------------------

neox

29 Sep 2009 00:19



-----------------------------------

As vrea sa foloses teava mai mare din cateva motive.
Daca pun teava mai subtire atunci artrebui luat mult la freza canalul unde montez axul de focusare si nu cred ca e o idee buna sa pierd atata material. E aluminiu totusi. In plus nu am o teava care sa se potriveasca pe interiorul tubului optic, deci cu diametru pe exterior de 84mm.
 
Dupa multe cercetari pe tema focusere crayord am observat ca cele cu pretentii mari si multe gen Moonlite sau Starlight incorporeza rulmentii in corpul principal si lasa spatiu mic intre acesta si tubul portoclar. Cred ca un motiv ar fi precizia la centrare. Cu diferenta mare intre cele doua tuburi sunt sanse mari sa se adune erori.
Uite cateva exemple:

 http://images.google.ro/imgres?imgurl=http://starlightinstruments.com/shop/images/2008DSBCRcr.jpg&imgrefurl=http://www.starlightinstruments.com/shop/&usg=__03c23QICZ9TLbjS2r72M4lSB7aY=&h=1000&w=1000&sz=103&hl=ro&start=403&um=1&tbnid=iL22jBFBJeQLlM:&tbnh=149&tbnw=149&prev=/images%3Fq%3Dcrayford%2Bfocuser%26ndsp%3D20%26hl%3Dro%26sa%3DN%26start%3D400%26um%3D1

http://images.google.ro/imgres?imgurl=http://www.teleskop-express.de/shop/Bilder/shop/tsoptics/Okularauszug/FOCR3/TSFOCR3-Seitenansicht.jpg&imgrefurl=http://www.teleskop-express.de/shop/product_info.php/language/en/info/p2526_3--Crayford-Auszug---1-11-Untersetzung-f--Refraktoren-Cassegrain.html&usg=__HRJ2sehc9err0igwB8r4-VucmZU=&h=273&w=400&sz=27&hl=ro&start=411&um=1&tbnid=5LmDWKV0wkEB1M:&tbnh=85&tbnw=124&prev=/images%3Fq%3Dcrayford%2Bfocuser%26ndsp%3D20%26hl%3Dro%26sa%3DN%26start%3D400%26um%3D1