"Not a dirty lens!" Rather disappointed with this footage I did not realise how bad the lens was. The SMF Trinicon tubes on the Sony betamax cameras were prone to misting or have lens shadow with age as in this case the camera is now 8 years old. The shadows are magnified with back ground light and unfortunately using some light adjustment to the footage it shows up even more. I think I used the camera once more after this before changing the camera.