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The Photon™ line of Ritchey-Chretien astrograph telescope has been expanded with the addition of four new truss tube models (10
7nm type of filters are available
Many optical designs that advertise themselves as "astrographs" actually only produce pinpoint stars across a curved focal plane
A fixed position primary mirror eliminates image shift that occurs when focusing from other telescope designs
Used Generic Lunar and Planetary Filter Set, 1.25" - 7 filters Shipping Charge The Photon™ line of Ritchey-ChretienCondition: This is a set of generic lunar planetary filters in excellent condition with clean optics. There is a total of 7 filters in this set: 82A, 56, 23A, 21, 12, a polarizing filter 3 (one piece), and a green lunar filter. This includes a jewel case and cardboard sleeve for each filter except the green lunar filter, which comes in its own cardboard box. Description: A nice beginners set of 1. 25 planetary filters for any telescope. See features
US$ 2500.00
US$ 1999.50
US$ 2999.50
US$ 599.50
