That's an exquisite lens on the Iskra. There is a part of me that regrets selling mine. You'll get some very good images out of it if you do your part; that is possibly the finest 6x6 folder ever made. Yes, I've used some nice ZI, Agfa, & etc folders. I still think the argument can at least be made as that remains the single finest Tessar I've ever shot.
My Best Pictures
Playing and learning daily with: 4x5 Crown Graphic, Leica IIIf w/ 50/2 Summitar, Nikon F2 Photomic w/ 50/1.4 & Olympus E-PL1.
"Some people are 'the glass is half full' types. Some people are 'the glass is half empty' types. I'm a 'the glass is full of radioactive waste and I just drank half of it' type. And I'm still thirsty." -- Bill Mattocks