Erik van Straten
Veteran
I have shot some at Infinity focus, and yet they are all OOF. Am I doing something wrong, or am I expecting too much of the Summar?
Could it be the lens reacting to the Delta's and DDX?
Do you lock your lens when you pull it out?
Is there any haze visible in your lens when you look trough it against a strong light?
Do you use a shade?
The Summar, especially a coated Summar, is stopped down capable of the finest results.
For fine grain high contrast results, the Tmax400 film is the best you can get, but I don't think your Summar is reacting in a bad way to Ilford films.
Erik.