Dario wrote with a question about filters:

Your nature photographs are absolutely amazing. I don’ t have any experience in nature photography (but I want very much to start learning about it). Do you recommend any specific filters for a 24-105L lens? (slim circular polarizer + ND filter / some specific brand?) Thank you very much for your help and congratulations for your highly professional photographs!

First, thanks for writing and thanks for your very kind words about my photography. I decided to answer your question with a post in my forum. I hope you find it useful!