TeleVue Paracorr Visual with Tunable Top

TeleVue Paracorr Visual - 2 Inch Format - Includes 1-1/4 Inch Adapter - Tunable Section - Brass Clamp RingsConcept: I have built Newtonian reflectors since my high school days and still enjoy observing with my 12 f/5.3. Knowing how the Nagler eyepiece complemented fast Dobsonians and Newtonians by removing eyepiece induced astigmatism I now became intolerant of the inherent defect of coma in a parabolic mirror.Paracorrmore stars sharper stars more time to observe. I decided to try to achieve the same field quality for parabolas as reached by my Nagler eyepiece and 4-element refractor designs. Existing coma correctors seemed to be limited in color correction spherical aberration and convenience in use. Paracorr (parabola corrector) uses 2 multi-coated high-index doublets is completely color-free center and edge and installs like a Barlow. Coma is corrected so well the diffraction limited field area of an f/4.5 Dob/Newt is increased 36 times! - Al Nagler An optical chain is as good as its weakest link. With the development of 82 degree Nagler eyepieces Tele Vue offers the largest flattest and best corrected visual fields in the industry. Combine the Nagler revolution Dobsonian revolution and Paracorr for the ideal mating for spectacular wide and sharp spacewalk observing. Life before ParacorrComa makes stars look like blurry comets whose tails point out radially from the center of the field. The faster your scope's speed the worse the effect. All parabolic mirrors used in Newtonian reflecting telescopes are limited in field sharpness due to coma. Even a perfectly made 13 f/4.5 parabola has only about a 0.1 degree diffraction limited field. Previous attempts to correct for coma have been limited in usefulness. Some correctors were designed mainly for astrophotography. Dedicated coma correcting eyepieces were another approach. However these were limited to 50 degree apparent fields and would orphan your existing eyepiece collection. Life with ParacorrParacorr is a universal corrector that tightens and intensifies star images on all f-ratios from f/3.5 to f/8 without adding any false color or spherical aberration! You no longer have to constantly shift a Dobsonian to keep objects centered for sharp viewing. Using a Tele Vue eyepiece put M-13 at the edge of the field and enjoy resolving its beauty as it drifts across your view. Paracorr is recommended for use with all Tele Vue eyepieces because our Pl?ssls Radians Panoptics and Naglers achieve higher levels of aberration correction than competitive models. However Paracorr is also compatible with other eyepiece makes. Paracorr Eats ComaThe Paracorr can be used with both 2 and 1 1/4 eyepieces as well as with your 35mm camera body. For visual use slip Paracorr into your focuser like a Barlow lens and your eyepiece into Paracorr. 1 1/4 eyepieces will make use of Paracorr's special low profile 1 1/4 reducing adapter. Paracorr is threaded for 2 filters. AstrophotographyMount your 35mm SLR to Paracorr and the quality of full frame photos will be spectacular since star image sizes on film can be less than .001 over the full frame for an f/4.5 mirror. Edge-of-field sharpness is further enhanced since Paracorr also acts as a field-flattener. User ReportsWow - On our 30 f/4 and 17.5 f/4.5 using 10 different eyepieces we noted a 75% - 95% reduction in edge field coma. Paracorr is a must for anyone who owns a fast ratio telescope and enjoys wide field deep sky viewing. - Tom Bemus l begun my tests with the first quarter Moon and the 20-inch (f/3.9). Without a coma corrector there was a slight smearing of lunar detail away from the center of the field. It looked like the focus needed to be 'tweaked' but of course doing this did not improve the view. With the Paracorr the entire disk of the Moon appeared in sharp relief. -Sky & Telescope Magazine

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