When using Fluorescent Ring Light or Fiber Optic Ring Light, if no Auxiliary Len a Ring Light Adapter is necessary. Working distance is 88mm. Availability: Usually ships the same business day 2321Regular price: $24.00Sale price: $14.00     CONTACT US:1(888) 270-0828    |    BUSINESS FAX:1(888) 299-1195    |    EMAIL: info@usascopes.com