For 25 years, Tele Vue has pushed the boundaries of APO refractors, as well as eyepieces, to the recognised pinnacle of performance. The is version of the Tele Vue NP127 retains the exemplary wide field and planetary visual capability while adding new features to make imaging easier and more flexible. Tele Vue were determined to make the NP series optically, mechanically and functionally as perfect as possible for imaging up to 50mm diagonal chips without penalty to its near ideal visual operation. By applying the developments created for the TeleVue60is to the new NP127is and then going beyond the results speak for themselves. The NP127is maintains its 127mm f/5.2 optical specifications yet with a redesigned 4-element optical system. The larger rear lens group absolutely minimises vignetting in formats up to 50mm measured diagonally across the chip. An optional field corrector is available so the corners of the newly brightened edges are virtually as perfect as the centre of field. To prevent restriction of the larger converging light cone the focuser has a 3 inches front aperture and a 2.4 rear aperture. The new draw tube has features allowing quick changes from visual to imaging operation. While imaging cameras can be rotated without changing focus (just remember to do new flats!). It also has the capability to correct for any residual focal plane tilt so the imaging chip is square on to the light path. The imaging insert ring is threaded to accept Tele Vue's new Imaging System accessories including large diameter extension tubes, optical accessories and camera/CCD attachments all with mating threads. The Focusmate 6:1 planetary ball type reduction focuser is supplied standard and provides extremely sensitive focus adjustments (measureable with the optional Digital Micrometer Kit). The optional Focusmate driver also permits electric motorised control of the focusing process. The new Focusmaster software interface allows this entire procedure to be completed from a PC or laptop. Tele Vue has been known for producing visual instruments even better than you imagined. The new NP127is is evidence that they aim to achieve the same with their imaging equipment.
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