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focal length reduction: 0
the SV136 provides relaxed viewing even during long observing sessions
So the number of for example "H-alpha-photons" does not change significantly whether an H-alpha filter is installed or not
the files must in MP3/WMA format
this adapter allows you to easily adjust the camera angle for optimal framing of celestial objects without having to reposition your telescope
Retekess TT110 2.4G Tour Guide System for Tourism Large Screen Variants:1 Transmitter and 15 Receivers focal length reduction: 0Retekess TT110 2. 4G Tour Guide System for Tourism Large Screen Retekess TT110 wireless tour guide system is a new model in 2020 with better audio quality and customer concentric features, the whisper tour guide system designed with a large size of IPS display screen, upgraded magnetic charging method, it adopts latest 2. 4G transmission technology, range up to 100m in the open area with stable signal and better confidentiality. The wireless
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