Optec NextGen Ultra WideField 0,7x (NGUW) for Telescopes with field correction
This telecompressor was designed specially for systems with well corrected optics and flat fields such as can be obtained from apochromatic refractors. New parfocal 0.7x reduction telecompressor specially designed to work with Apochromatic designs such as the Takahashi FS-series, Astrophysic´s, and other high-end refractors. The speed of a f/8 telescope would be increased to f/5.6 with this reducer and the optics would still be nearly diffraction limited. This four-element system also maintains the parfocality of the telescope since these types of telescope have more limited focus compared to SCT´s. The image field is highly corrected to 18 mm diameter so that large format CCD cameras can be used.
The Ultra WideField 0.7x will work for any focal ratio in the range of f/5.6 to f/20. The field is highly corrected up to 18 mm in diameter and would work well even with larger fields with only slight degradation near the corners.
Like the other reducers in the NextGen series, all surfaces have a broadband multilayer coating optimized for the 450 nm - 650 nm pass band of the optic.
The optical design of the NextGen 0.7x was done with ZEMAX and optimized for four field points using wavelength of 450 nm, 550 nm and 650 nm. The goal was for the smallest blur diameters for the four field points. The system was modeled using an idealized telescope of f/8 and with perfect optics. The resulting lens curvatures of this designed were made without adjusting the radii to the optical lab´s tool list. Custom tools were made for all surfaces.Delivery contains:
Optec NextGen Reducer for Telescopes with Field Correction 0.7x with 18 mm field.