Fungus decimates the value of equipment, whether it be Hasselblad, Nikon, Canon, Leica, Sony, Fuji, Bronica, Mamiya, Olympus etc. All users of film and digital cameras and lenses MUST store equipment appropriately.

This video explains how to spot it and how to avoid;

0:00 Introduction
0:34 What is fungus
1:45 How to spot fungus
4:18 How to avoid fungus

Jonathan Harris - Worldwide Camera Exchange Ltd