Details
Description
In mint condition, supplied with Nikon adapter but you can order different adapters from Optec
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The Ultra WideField 0.7X is a coupler from Optec and is designed
specifically to speed up the focal ratios of highly corrected telescope
systems. This design assumes that the image formed by the telescope is
reasonably flat and aberration free. If so, the resulting image will
also be highly corrected and nearly parfocal with the original image.
Optimized for an f/8, 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
18mm 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 - 650 nm pass band of the optic.