Some words of explanation:
Shots were made with an old Practica PLC3 or a little younger Mamiya XR-X camera with Hoya R72 filter (Wratten 89B). I measured light with handheld exposure meter, but not too accurately, I am afraid.
New shots, added on September 4, are made with Canon EOS 50E and Cokin Red Filter, film was rated as 400 ASA.