M68 EXTENSION RING 5mm Saxon Watertight rubber seal around the

Watertight rubber seal around the lid

Communication ports

Deep Sky Tour function that suggests a list of the most interesting deep sky objects currently visible

Photographically

Pointing is made accurate through the use of a model containing up to 100 stars

M68 EXTENSION RING 5mm Saxon Watertight rubber seal around theThis 5mm extension ring is often used for professional field flatteners such as the SharpStar 2. 5" field flattener. The extension ring has an M68 x 1 male thread on one side and an M68 x 1 female thread on the other side. The total thickness is 9mm which includes the 4mm male thread. Specifications Connection (side a) M68 x 1 male Connection (side b) M68 x 1 female Optical thickness 5 mm (not including 4 mm male thread) Clear aperture 63 mm SKU