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Clamps

For afocal camera attachments, clamp most used is
1.25 inch M42x0.75 to 1.25 inch Adapter with Brass Compression Ring.

SVBONY replaced theirs by SA404 M48 to M42 Adapter,
which for larger eyepieces avoids using an M48 to M42 step-down ring,
instead wants an M48 male-male coupler, typically more costly than M48-M42 step-downs.

  • with a brass shim, this clamp secured to many objectives and eye tubes:
  • M48-m42 step-down (green arrow, above) fits M48 extension tube (below):

  • 48mm extensions work for Nikon 30mm tube and Chinese WF10x/22 oculars:

  • M52-M48 step-down (green arrow) fits EF 40mm STM pancake to M48 tubes: