This lens reduction lens / field correction lens fitting can be used in the Startent 5-inch, 8-inch, 9.25-inch, 11-inch and 14-inch Schmidt - Cassegrain telescope. This flexible accessory allows the telescope to have two coke ratios without sacrificing quality. This reduction lens / correction lens can make C5, C6, C8, C9.25 coke ratio becomes f / 6.3, and C14 coke ratio can become f / 7.Use this reduction lens can increase the field of view, in astronomical photography can reduce the exposure time.Star Treon does not provide f / 6.3 Schmidt Cassegrain telescope, because such a design is not possible, there will be a large central block and lead to a decline in contrast. This section f / 6.3 of the lens / corrective mirror is a four-piece design, full surface coating.Use this lens, in the visual and photography have a very good performance.
