Ole- Apo-Tessars out, regular and Aero, maybe... Thank you!

John- Thanks, you just saved me $150; I was thinking of ordering the 530mm Ektanon.

Dan- Yes, I've heard the Aero Tessars/Ektars were made for 9x9 and 9x18, but then the Nikkor-M 450mm is for 8x10 with a rated coverage of 440mm. I may end up springing for the Nikkor or Fujinon, but I'll grumble about it for years...