Sirius Variable Filter System

The Sirius Variable Filter System incorporates the capabilities of many filters. The filter is 71mm

The Sirius Variable Filter System incorporates the capabilities of many filters. The filter is 71mm in diameter and is housed in an aluminium cell that accepts 1.25` eyepieces and is inserted into the telescope focuser. An exposed wheel permits the observer to continually adjust the spectral response. It can be adjusted to become a Nebula or a Broad Band hydrogen alpha Filter. Further adjustments can be made for contrast improvements on various objects. Since most objects do not respond ide

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