The Ricoh XR Rikenon 55mm 1:2.2 lens on the left is a standard K-Mount and will present no issues. The lens on the Right is a later Rikenon -P 50mm 1:2 with the infamous Ricoh pin at 7 O’Clock. AF Pentax users beware !!

The Ricoh XR Rikenon 55mm 1:2.2 lens on the left is a standard K-Mount and will present no issues. The lens on the Right is a later Rikenon -P 50mm 1:2 with the infamous Ricoh pin at 7 O’Clock. AF Pentax users beware !!