![]() The RASA 11 utilizes a redesigned focus system, called the Ultra-Stable Focus System (USFS), which minimizes unwanted lateral movement of the primary mirror when focusing or slewing the astrograph, thus minimizing both “focus shift” and “mirror fl op”. The focuser moves the primary mirror forward and backward within the rear cell. Alternatively, the fan can be powered with any 12V DC power supply which provides at least 100mA and has a 5.5 mm/2.1 mm tip positive DC power plug. ![]() We recommend powering the fan on before using the RASA, you can do this while preparing your other imaging equipment so the astrograph has time to cool down to the ambient temperature. Plug the supplied battery pack into the power jack near the fan to turn the fan on and unplug power to turn the fan off. The supplied battery pack requires 8 AA batteries (not included) install the batteries as indicated in the plastic mold of the battery holder. The RASA is equipped with a cooling system containing a 12-volt DC MagLev fan. The greater the temperature difference between where the astrograph is stored and the outdoors, the longer it takes to cool down. It takes time for the optics of the RASA to reach thermal equilibrium with the outside air. Loosen the ring no more than 1/8th turn, rotate the camera as desired, and retighten the ring, Once the camera is installed, you can rotate it by slightly loosening the retaining ring. Keep the camera adapter snug against the lens group housing, but do not over tighten the retaining ring. Do not over tighten! Camera orientation can be adjusted later.Ĭaution: Over tightening the retaining ring can increase the chance of loosening the lens assembly on the corrector, or cause the lens assembly to rotate against the corrector. Turn until the camera adapter is snug against the lens group housing.
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