![]() As we said, that distance is measured from the reference surface to the imaging sensor. The “Prime Focus” section in the instructions for the Tele Vue-NP101is says to use a 69.85mm (2.75″) spacing for imaging sensor up to 43mm on the diagonal (full-frame) and 67.82mm (2.67″) for larger sensors. You must look at the instructions for the optic, or the telescope it was designed for, to learn what distance to set.Ĭontinuing with our Imaging System example, the Large Field Corrector (LCL-1069) optimizes the edge of field when imaging through the Tele Vue-NP101is and NP127is telescopes. Traditionally, however, the Back Focus distance is measured from the center of the last lens surface to the focal plane. For Tele Vue Imaging System accessories, we use the flat surface at the base of the male threads on the metalwork as the reference surface since it is easy surface from which to measure. ![]() ![]() In this blog, we’ll go through an example of how this is done.ġ) Determining the Required Distance from Optical Accessory to Sensorįor optical accessories to work properly, the camera sensor must be located a prescribed distance from the optic.
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