| This whisper-quiet low-vibration compact fan speeds up the cooling of your big reflector’s primary mirror down to ambient temperature. It reduces the time it takes your mirror to reach thermal equilibrium, reducing the amount of refocusing needed while your mirror cools so you can get your best observing images more quickly. It attaches to pre-tapped and threaded holes in the mirror cells of Orion SkyQuest XT8, XT10, and XT12 IntelliScope Dobsonians. Mounting screws are supplied. It runs on 12 volts DC power supplied by the included battery pack, which uses eight D-cell batteries (not included). You can run the fan prior to observing, then turn it off, or you can even keep it running while observing; there is no noticeable vibration. Battery life is about 13-14 hours of continuous operation. It is also compatible with a 12VDC rechargeable field battery by using the appropriate DC power cable. |
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