Thanks for the replies, great!

About my gear (it’s not that new): I have a Canon 50D that I use for photography and my lens is a Sigma 50-500 with the OS. People mostly say Sigma is not that good, but the lens as good as the skill of the photographer. The reason I choiced the Sigma lens is because of it’s range. I don’t want to be limited on a certain mm point and I always like to make a variety of photos full frame or a close-up. And the extra is I don’t need to change lenses all the time;)

Maikel