Curt said:
When traveling is a customs declaration for your camera equipment necessary?
I spent four days travelling back between the US and Canada doing a photo shoot. It was a very small crossing, the same crossing guards every day. The people we were with grew up near the crossing town (two buildings and a store), and grew up knowing the crossing guards. There was very little traffic ever, and they knew us, knew what we were doing, where we were going, who we were staying with, what the fishing was like, you name it.
The first time going over to Canada from the US (my starting point) I registered ALL of my gear - anything with a serial number. The guard was interested in the gear and asked lots of friendly questions about it. On the way back a few hours later the exact same crossing guard that helped me fill out the paperwork demanded to see said paperwork. It was late and snowing, we were tired and hungry. I had been up for a long time and had trouble finding the paperwork, and when I couldn't produce it right away he started writing up everything in order to tax me he said. This was tens of thousands of dollars worth of video gear. When I finally found the paperwork he got pissy that all his writing was in vain. He went through every piece of gear and checked the serial numbers against the paperwork that he had helped fill out. It took a long time.
On the fourth day, after having made the crossing more times than I could count they hit me with a $50 "business use" crossing fee, because I was taking jobs from Americans somehow (the rationale being that if I had done the shoot in the US incidental money would have been spent in-country rather than across the border). I protested and said that they never told me any of that before-hand, or on any other day we had crossed. They wouldn't let me through until I had paid, despite several trucks worth of gear going ahead of me.
The Canadian crossing guards never gave us those problems. They gave us others - mostly involving raiding our food supply for anything that looked tasty (you think I'm kidding???). The whole thing was a disaster as far as border crossing went.
I learned many valuable lessons on that trip. However where gear is concerned I now over-document everything.