Good evening I've just found this cute vintage camera called SMENA 8M. Today I bought a film, then followed some tutorials and loaded it into the camera. Now I'm facing a strange problem. To advance to next frame you need to use "Advance wheel" but how do I know that I'm on next b frame? I'm afraid of rolling that wheel, what if I roll through half of the film without even noticing? How do you do it guys? Thanks in advance, sorry for stupid question but I'm newcomer to this "lomography bussines".