Filter/accessory thread on large lenses and telescope equipment.
Found on some telescope focuser drawtubes and larger optical components.
Common filter thread on large telephoto lenses. Found on Canon 16-35mm f/2.8L, some Sigma and Tokina wide-angle lenses. Standard for 82mm filters.
Found on some telescope accessories and large optics.
Filter/accessory thread on some lenses and telescope equipment.
Filter thread on some larger professional lenses.
Found on some larger telescope accessories and professional camera equipment.
Filter thread on some professional telephoto lenses; also on some telescope accessories.
Found on some telescope focuser assemblies and large optical equipment.
Filter/accessory thread on some large lenses and telescope equipment.
Equipment and systems: Askar SQA106 telescope tube.
Filter thread on some large professional lenses.
Found on some large telescope accessories and professional lenses.
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