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6nm MaxFR filters: Usable from f/2
Built around the AR0130CS 1/3" CMOS sensor
The Astronomik UHC is THE filter for visual observing
so the number of "H-alpha-photons" doesn't change much whether or not a filter is used
Retekess TT109 Long Range Tour Guide System sv305m pro 6nm MaxFR filters: Usable fromRetekess TT109 Long Range Tour Guide System Open air transmission distance up to 180 meters One click pairing of all receiver channels 2. 4 GHz signal transmission with stable sound quality Transmitter and receiver can be hung on the neck, freeing your hands Pocket size and light weight, easy to carry. Battery runtime It only takes 2 3 hours to fully charge, the transmitter can work for 8 hrs and the receiver can work for 18 hrs after a full charge.
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