Hi happy people,
I have a Sigma 80-400EX Optical Stabalised lense, and it's around 6 months old now.
I was giving all my gear a thorough cleaning the other day, and I have noticed a couple of dust specks inside the lense.
They are not visible on the photographs I take - or at least I can't see them .
At what point does it become too much dust- is that when you see the specks on the shots??
Thanks for any info