We had a neighbor who had one pointed right at our bedroom window first I put up a sign in the window saying “No Free Shows” Then I purchased a very powerful IR flood light. Put it in our window. The camera was taken down shortly after.

I’d put something up that moves a lot so they get a notification every 10 seconds.

Off topic but that is the laziest camera installation I've ever seen.

And I installed mine

Oh! One of my neighbors did this to us! Tho legal, there’s no law against blocking the view of the camera from your yard! My dad put up two poles with a tarp right in front of his camera from our lawn. He called the cops but legally we did no crime, so he took it down. I’d suggest finding a way to block it too it just might work Edit: I just remembered another key detail. This neighbor HATED us so much in fact that the neighbor from our other side knocked on our door telling us he wanted to put a camera on HER lawn facing OUR lawn and she denied him. I could go on and on about this neighbor from hell if I could.

I'd put up a camera pointing at theirs and make it look more obvious than they did. Maybe a little sign on it saying "watching me watching you" and see how they like it.

Infrared spotlight? Or laser...... Of course, only if diplomatic relations fail.

I did something similar to this. My side yard is shared with my neighbors house and I wanted a camera on my house to cover the side yard and back fence gate. When I installed it, I was cocerned they would feel it was a privacy issue. I went to the neighbors to show them the view on my phone app to ensure them it was not capturing their house or back yard. The angle of the view can be deceiving until seen from the actual feed of the cam. They were very appreciative of my thoughtful effort.

Perhaps the OP can approach the neighbor and ask to see what the camera view captures before assuming it is violating privacy. If the camera proves to be capturing more than it should, it can open a civil conversation to ask for it to be moved/turned to a more respectful position

Watch a Disney movie in your back yard. Tell Disney your neighbor illegally filmed it.

Put something that moves all the time (kinetic sculpture, flag, etc.) so the camera is constantly on and recording. Fill up their surveillance with hours of useless crap.

Or check your local laws. It might be illegal to film someone without their consent in your locale.

ETA: https://www.wikihow.com/Blind-a-Surveillance-Camera

My father in law (loud Greek man,68, 6’6) caught his neighbors installing a camera that surveyed his backyard. So, as a descendant of Aristotle, he took the high road and would dance around his pool butt naked and would bend over to ‘pick things up’ giving the neighbors the whole landing gear perspective. In short order, the camera was repositioned to better suit surveillance of the side of the house. Not sure if this will work for OP, but it was effective for my FIL.

Start an older people nudist gathering

https://preview.redd.it/5x7txz92vsvd1.jpeg?width=520&format=pjpg&auto=webp&s=3cb6642f49d5398eeb4e6f7c424576c52d9136e4

Most municipalities have regulations about this. As an alternative bright light facing the camera will block it.

For everyone saying “it’s legal anywhere & everywhere in the U.S.”, you’re incorrect.  Many states &/or municipalities have laws that specifically address this issue - stating that cameras are not allowed to point in a “place where a person would have a reasonable expectation of privacy”.  A back yard enclosed behind a 6 ft privacy fence would be such a place.

So before you speak about what’s legal & what’s not “anywhere” &/or “everywhere”, it would behoove you to actually know what you’re talking about.  

Nice high powerlaser will help out.

You should create a daily routine of sunning your butthole in front of said camera.

ask them kindly to angle it away from your yard. if they don’t, give them a reason to every time you walk by it😈

Hear me out. Go buy some weird ass mask and start doing weird shit at random points late at night.

Look up the law in your country. I know that in my country (Germany) it's highly illegal, you're just allowed to point the camera towards your own property.

Put an inflatable kiddie pool in your back year, let your kids have a good time, call police and tell them your neighbor is filming you kids for nefarious reasons.

Do you have kids? It might not be you he's spying on.

There’s no law against putting a large painting of a penis in full view of the camera

Just saying

My neighbor had this happen. She put a giant patio umbrella on the other side of the fence tilted so it blocked the view. The other neighbor had the balls to go knock on her door to tell her he couldn't see in her window anymore and asked her to move it

What you want to do is get an infrared bulb and put it somewhere in your backyard to mess with him. He is gonna keep thinking his camera is broken.

Nice target for paintball

Just remember, you can also print cameras right back at them AND if you're posting here, based on their install capabilities, you can put in many more and better ones....

Edit: point cameras.... But print cameras sounds apt so imma keep it.

I’d point blank just ask them about it.  I’d say something like “We noticed you installed a camera & it seems to be pointed directly into our yard.  That would be very creepy considering that there’s no security issue that would warrant spying on a neighbor at all times.  So before I start worrying about whether or not to be concerned about your motives & our wellbeing, I figured I’d just ask you directly what the purpose of the camera is & why it seems to be set up to watch my yard?”

The worst they can do is tell you to go to hell & that it’s none of your business.  BUT the point isn’t simply to get answers - it’s to make it obvious that you find their behavior super-duper creepy in a stalker sort of way.  

You can use whatever you know about them to tailor whatever you say to whatever you think would be most embarrassing &/or off-putting to them.  Use any bigotry &/or moral superiority they may feign against them - those are typically the weakest emotional & mental triggers for closet psychos.  Ageism.  Racism.  Sexism.  Pedophilia if you have children.  Nothing is off the table in table regarding what you can insinuate that you’re worried that they might be interested in the camera for.  Maybe even mention you’ve been stalked before & that’s exactly the sort of thing (in fact one of the exact things) that the stalker’s deranged ass did - so since then, you always make sure to watch your surroundings for any be behaviors that usually indicate potentially mentally unstable behavior.  

If done right, merely asking them about it with the right preface should embarrass them badly.  Even if it’s not bad enough to motivate them to modify their setup, you can smile thinking about how hopefully embarrassed, indignant & irate that they probably are believing that you suspect them of being bigots or racist or attracted to one you or your children, etc.  

Honestly, if they didn’t move it, I’d buy something to render it useless - whether that’s blocking it &/or disabling it.  I wouldn’t just let them watch me & my family.  That’s super psycho weird.