paris walk

Thank you for your replies. I will have it looked at and go from there :)

Hi, I decided to try my hand at Medium format and I know I didn't start with the easiest of cameras but I got hold of a Pentax MLU 67 and decided to give it a go. In my naivety I went ahead and paid to develop 3 films from a studio shoot and all came out blank. I shot at 1/60 instead of 1/30. My research has told me that I should have received back frames that are half black but they are all completely transparent. I shot at f16, ISO 80, non leaf lens, film Ektar 100 colour, new batteries. Could somebody tell me where I went wrong? The lab told me it may have been an issue with loading film but I don't think so, I had one frame that I shot with natural light and that one came out ok. I guess to those experienced here my issue may be obvious so I thought i'd see if somebody can tell me my mistake. I don't think this is the camera for me if anybody in Sweden wants to take it off my hands :D Thank you