Blotches on film! Storage, development, camera... some thing else?
I had some 35mm film developed (Neopan 400) and some of the images have turned out with 'blotches' (see attachment).
I had a previous film developed (Ilford HP5) at the same lab, from the same camera and lens, without any issues.
Initially, I thought that it might be dirt on the lens, as I was taking pictures in a muddy field at one point. But, the blotches are not on all the images and, when they do appear, do not seem to be in the same place each time.
The films were bought from different shops, so I wondered if it might be a storage issue with the Neopan? Or is it a development issue, or something else? The films are well within expiry dates and I didn't pass through x-rays with them. Does anyone recognise what might have caused this?
I've attached a detail of the issue (I've enhanced the contrast to show it up better).