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The image sensor in the camera needs cleaning. You can buy cleaning kits, but often you'll just make the problem worse until you gain experience. Many camera shops now offer professional sensor cleaning so you might decide that it's better to pay someone else to do it for you. If you join a local camera club there's also usually at least one sensor cleaning guru who can do it really well if you buy him or her a beer.
Prevention is better than cure, so always blow dust off the camera and lenses before changing them, and never leave the camera for any length of time without either a lens or a body cap on the front.
Are you talking about spots you see on the pictures? Are these spots you see in the same place on all the pictures? If you really want to see if your sensor is dirty pick a clear day with a great blue sky focus to infinity and then shift the lens to manual focus and the program to "P" take a pitch of the blue sky. Then down load this picture to the computer and open it up to 100% and look it over if there are spots then the sensor should be cleaned. Even if you take the lens off and look into the camera body you still can't see the sensor all you are looking at is the mirror inside the prism box. To clean the sensor you need to put the camera into "clean" mode which locks the mirror up. It may be possible you just have a dirty lens or UV filter.
Before testing your sensor look at and clean the front element of your lens or lenses, clean with the proper lens cloth don't use liquid lens cleaner instead just huff on the lens to create a little moisture and clean off with the lens cloth. That's a lens cloth not tissue, also remove the lens and keep teh camera body mount facing down so not dirty falls into the cavity and ot put the body cap on.
Check the lens rear element for dirt partials and remove carefully if there is, remove body cap and install the lens back onto the camera.
Next I'm going to give you a quick test method to actually see if your camera sensor is dirty.
On a good clear day with blue sky go outside switch the camera to "P" program focus on a subject at infinity then shift the lens to manual focus. Point the lens skyward to a clear patch of blue and take the picture(s) Now down load this picture to your computer and enlarge it to at least 50% I use 100% but I'm way fussy and my prints can go to poster size so i need clean/
Anyway look closely at that blue sky if you see spots of black then the sensor is dirty and needs to be cleaned by you or a professional. There are special kits for cleaning sensors on the market BUT, make sure you are confident it what you are doing because the sensor is extremely sensitive to damage. Read your manual on this cleaning function.
If you are seeing the "spots" when a black screen is projected, the problem is likely to be scattering caused by dust on the lens. If you can get at both ends of the lens assembly, clean both sides using lens tissue. If the spots are seen at all times, there may be damage to one or more of the LCD panels.
Please update this with your results of the cleaning.
It sounds like you have a spot of dust inside your lens. When you zoom to maximum, you are using the "digital zoom" in addition to the optical zoom, and so the camera isn't using the pixels that have the dust spot covering them up. It may be difficult to get the dust out on your lens without taking it apart, but try using one of the dust remover cans you can get at a hardware store. You might have to send it in or take it to a camera shop, and they may have better ways to get it cleaned out. It could also just be a spot on the surface of the lens, which you can clean with a lens cleaning cloth. Post a comment with your rating if this doesn't help, and maybe you can post a picture that shows the defect. That would make it easier to see what exactly is happening.
You did not mention the model of your camera but I assume its a compact camera.
It happened to me once. I opened the camera, strip the cards and cleaned the lens.
But I warn you, its very annoying operation. You need shakeless hands and super focusing abilities. And also it takes time, need patience. Use mild cleaner not strong one. You may use a hand blower, this method is more simple, dont need to go through lens and strip entire cards etc. Just open the back of the camera and look for a cavity to put nozzle through to lens area and cross your fingers than blow it lightly with hoping the dust gone. :)
If its inside the viewfinder, then you'll really need to take it in for a repair, but bear in mind, that will require disassembly and that will likely run you $75-$100, which is more than a used X370 goes for on eBay.
One thing I would check is the underside of the focussing screen as maybe it is on there. Remove the lens and then look thru the viewfinder. If you still see the spot, then its in the body and not in the lens.
Look inside at the underside of the prism - thats where the focussing screen is. Do not touch the screen with any cleaning fluid or your finger. instead, grab something fairly stiff but pliable, like the straw on the edge of a dust blower. and gently rub the general area on the screen where the spot might be. Then blow the area with air to clean it all up. Look thru the viewfinder again and see if that got it.
Its pretty rare for dust to get inside the viewfinders unless they had previously been open for a repair, so theres a good chance its stuck to the focussing screen. Don't touch it with solution or your finger though as the screen can be damaged easily.
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