Cooke SP3 18.5mm Custom Adapter
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This custom adapter threads directly onto the front of the Cooke SP3 25mm T2.4, widening the field of view, effectively making it an 18.5mm T2.4. It features an all aluminum housing, and optics chosen to give the perfect balance of image sharpness, flatness of field, and flare character.
Front Diameter - 110mm
Weight - 1.16 pounds