I bought these from redstan together with a mint Iscorama 36. I needed to sell the lens - needed the money.. Still in original box. Much better than the ok Tokina.. They are called Iscorama-vorsatzlinse III 0.5 Dptr. (1-2M) Iscorama-vorsatzlinse II 1 Dptr. (0.67-1M) They have 72mm thread and they are like new. Redstan sold Them as NOS ( New Old Stock) Price 600£ UK Pounds Sterling + shipping from Sweden