Twisting top section into bottom - spring action (fountain pen). Assembled this collection over 20 years.
Recently we have had problems with people not understanding how their item works.
Incl Hoya Prisma Panagor Soligor +Case +Flash ++++. Soligor Mirage 49mm Filter - made in Japan. Prisma 52mm Vertical - made in Japan.
Hoya 55mm Multivision Adapter - made in Japan. Hoya 49mm Variocross - made in Japan.