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There is an ever growing demand for filters suitable for extremely fast optical systems like Celestron´s RASA the Epsilon Astrographs made by Takahashi
allowing you to expose longer – perhaps 30 minutes instead of 30 seconds – to record fainter structures
as our special coating technique ensures they do not degrade with age
more sensitive and quieter
Using narrowband filters
Retekess TT109 Tour Guide Transmitter 2.4GHz One Way font There is an ever growingRetekess TT109 Tour Guide Transmitter 2. 4GHz One Way Retekess TT109 2. 4G one way tour guide Transmitter with landyard Retekess TT109 is 2. 4G, it is free use in the world. And this is a long range tour guide system. If you need the range over 100 meters, and you need a lanyard to wear, and the separate headset with the receiver. This is perfect for you. Features: 2. 4GHz signal transmission with stable audio quality One Way communication One key
