So I've only been into photography and cameras for about a year now so this might be a weird question but I've got a Rolleiflex K4b from 1956 and I have a question about the lens and film. It's a 75mm 3.5 Tessar that has no T on it. Is this lens coated and if so is it T coating or something cheaper? Also if it is not coated would color negative film come out looking alright? I only have shot black and white through it but I'm thinking about getting some Portra. Any information would be greatly appreciated.