Celestron Reducer/corrector Lens

2.099,00 NOK

Beskrivelse

Celestron reducer/corrector lensSpesifikt designet for katadioptriske Schmidt-Cassegrain-teleskop fra Celestron. Linsen reduserer tubens brennvidde med 37 %, og resulterer dermed i et lavere og mer lyssterkt blendertall. En modell med et relativt lyssvakt blendertall på f/10 konverteres for eksempel ned til f/6,3. Lavere brennvidde betyr også at du kan oppnå lavere forstørrelse enn det ellers er mulig med kraftige Schmidt-Cassegrain-teleskop; en stor fordel hvis du skal observere de største Messier-objektene (Oriontåka, Andromeda etc.). Lavere blendertall øker teleskopets evne til å tegne lyssvake objekter, idet lavere blendertall betyr bedre utnyttelse av tubens objektivåpning. Fra produsentens engelskspråklige produktpresentasjon Achieve shorter focal lengthExplicitly designed for Celestron Schmidt-Cassegrain telescopes, this unique lens reduces your telescope’s focal length and f/ ratio by 37%, turning your long focal length telescope into a fast, short focal length instrument. A f/10 focal ratio now achieves a f/6.3, while an f/11 focal ratio now achieves a f/7. For visual use, this means you get lower power with the same eyepiece and a wider field of view. Photographically you also get a wider field and much shorter exposures.How to UseThe Reducer/Corrector is easy to install by threading the unit onto the rear cell of your Schmidt-Cassegrain telescope (or the reducer plate of the C11 and C14). Once installed, you can add additional accessories like T-Adapters, 1.25” Visual Back, Star Diagonal, or Off-Axis Guider.The Reducer/Corrector can also be used for terrestrial digiscoping. The faster f/ratio allows you to use slower film or shoot in lower light level situations and still properly expose your subject. This fully multi-coated lens provides maximum light transmission with near full-field illumination.Place the plastic covers on the lens when not in use to reduce the dust collection.BodyThe lens is housed in machined aluminum for are machined aluminum black anodized. The internal surfaces are blackened and glare-threaded to provide the highest contrast. The lens has a knurled surface, providing a tremendous gripping surface for threading/unthreading.Due to the design, the Reducer/Corrector lens does diminish a small amount of field curvature common to all Schmidt Cassegrain telescopes but does not eliminate it. High power views will provide flatter fields all the way to the edge, both visually and photographically.Unique focal reducer and field corrector lens accessoryReduces the focal length and f/ ratio of your Schmidt-Cassegrain telescope by 37%Provides a dual focal ratio instrument, without sacrificing image qualityCompatible with all Schmidt-Cassegrain telescopes (see compatible list in description)