indiawilds
Veteran
1DC is definiely weather sealed with an appropriately weather sealed lens attached (some folks forget that detail). I’ve shot many times in heavy rain and snow with a 24-105 L (with filter) and no issues. Wouldn’t ever attempt that with a naked C200.
I’ve read many places that the C300 line is sealed, but have never seen official verification on that...
The C300 is weather sealed. For my original C300 review, I had posted the Canon weather sealing points. Have a look here: https://www.indiawilds.com/diary/review-canon-c300-for-wildlife-filming/
For the C300 Mark II as well the weather sealing is similar. Don't have the sealing diagrams for C300 II and C200. Will see if I can get and share.