Hello, Im primarily a Large Format 4x5 8x10 photographer and i Love shooting older brass Petzval lenses. I use my 5DII camera when theres no budget and I was wondering if they're lenses out there that has that unique signature. I tried the Biotar 58, rokkor 58mm 1.2, but its not quite what I am looking for. Maybe the Helios 40 might work or Biotar 75mm. any thoughts? thank you.