Very large thread used on large-aperture telescope focusers and accessories.
Found on some large telescope drawtube assemblies and accessories.
Large telescope focuser thread; also filter thread on some super-telephoto lenses (Canon, Nikon 500mm+ primes).
Filter thread on some lenses.
Equipment and systems: Sigma 60-600mm f4.5-6.7 DG DN lens (Sony version).
Found on some very large telescope accessories.
Found on some large telescope accessories.
Found on some very large telescope accessories and professional astronomical equipment.
Equipment and systems: Sirui Jupiter 28-85mm lens filter thread.
Very large thread on large-aperture telescope accessories.
Equipment and systems: Apo-Nikkor 11/760mm process lens.
Found on some very large telescope drawtube assemblies.
Found on some large telescope accessories.
Equipment and systems: Omegon ED 100/600 APO Doublet.
Found on some large telescope accessories.
Found on some very large telescope accessories and professional astronomical equipment.
Found on some very large telescope accessories.
Very large telescope thread; used on some Schmidt-Cassegrain accessories and large refractors.
Very large thread found on some large-aperture telescope accessories.
Very large telescope thread found on some large-aperture refractor focusers and observatory equipment.
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