About this product
Part Number: VIP-2010
Tele Vue Paracorr Coma Corrector.
With the development of 82 degree Nagler and 100+ degree Ethos eyepieces, Tele Vue offers the largest, flattest and best corrected visual fields in the industry!
Combine a Nagler/Ethos eyepiece, a Dobsonian telescope and the Tele Vue Paracorr for spectacular wide and sharp 'spacewalk' views.
An optical chain is as good as its weakest link. All reflector telescopes with parabolic mirrors suffer from coma, an aberration that makes stars look like blurry comets with tails pointing outwards radially from the centre of the field. The faster your telescope, the worse the effect. All parabolic mirrors used in Newtonian reflecting telescopes have limited field sharpness due to coma. Even a perfectly made 13" f/4.5 parabola has only about 0.1 degree diffraction limited field.
Paracorr is a universal corrector that tightens and intensifies star images on all f-ratios down to f/3 (see spot size graphs: PDF or JPG) without adding any false colour or spherical aberration! You no longer need 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 it's fully resolved beauty as it drifts across your field of view.
Easy to use. It slips into your focuser just like a Barlow. To minimize focuser in-travel, due to additional length, a mild 15% Barlow effect was designed into Paracorr to effectively push the focus out.
Recommended for use with all Tele Vue eyepieces. Tele Vue Plössls, Radians, Panoptics, Naglers, Ethos and Delos eyepieces achieve higher levels of aberration correction than competitive models. However, Paracorr is also compatible with other eyepiece brands.
Can be used with both 2" and 1¼" eyepieces. For visual use, slip Paracorr Type-2 into your focuser and your eyepiece into Paracorr. 1¼" eyepieces will make use of Paracorr's special low profile 1¼" reducing adapter. Paracorr is threaded for 2" filters.
The Paracorr Type 2 optical assembly is also available in a special adapter housing made by Starlight Instruments for their Feather Touch focusers. This unit avoids the need for a tunable top to optimize eyepiece position. Some Dobsonian manufacturers may also offer the Feather Touch focuser with integrated Paracorr type 2 as standard. Starlight Instruments offers Paracorr Type 2 integrated with Feather Touch focuser or as an add-on if you already have a Feather Touch focuser.
Paracorr also works with DSLR and CCD cameras. Just unscrew the lens assembly from the Tunable Top and attach appropriate threaded accessory tubes and camera mounts.
Optimizing the Coma Correction by Using Paracorr's Tunable Top
Optimizing the coma correction with your Paracorr requires the correct distance from the eyepieces focus point (field stop location) to the last surface of the Paracorr lens (within a small +/- tolerance of course). Typical eyepieces used with fast Newtonians can have field stop locations differing by as much as half an inch. To accommodate for the differences, we developed the "Tunable Top."
The "Tunable Top" permits optimized aberration control for all Tele Vue eyepieces and many others, by simply loosening a screw and rotating the Tunable Top. The eyepiece barrel height raises and lowers, allowing you to maintain the proper field stop to Paracorr lens distance.
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