Dear friends,
I recently found that my SIGMA 150-500 MM, lens has fungus in the second element from the front,though till now there is not any effect on image quality.I want to know how often and how much cost required for servicing of this lens.I am using this lens less than a year and not kept in with any moisture prevent substance like SiO2 JELL or in any air tight container.Can anybody inform me about this matter.
Please help.