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Introducing the Sodium D line version of the Quark
Explore Scientific 3X2" Focal Extender
This allows an even quicker adaptation to the ambient temperature and reduces the tube seeing (boundary layer removal)
Special low expansion H-PZ33 Material Secondary mirror 71
Explore Scientific 3" Flattener and .7X Focal Reducer Nikon Introducing the Sodium D lineExplore Scientific 3" Flattener With . 7X Focal Reducer Introducing this High quality and functional 3" Flattener With . 7X Focal Reducer by Explore Scientific. This 3" Field Flattener . 7x Focal Reducer is designed to enhance your astrophotography experiences and is a multi faceted accessory. This addresses the edge of field aberrations caused by curved focal planes as a field flattener to ensure that your night at the eyepiece results in crisp,