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Hi there you are right in your place. Its a dust. but you need to clean in different way. because the dust stick in side the lens and its not easily clean by that dust clean option. Some how your camera get moisture and dust stick on it. After drying the moisture that dust permanently stick there. So i suggest you visit a service center and submit your camera for manual cleaning. They use alcohol and cotton so the dust easily clean by them. Thanks.
I inform you that the problem only is moisture. Please follow this.
1. Put the camera in sunlight for few hours. After that use it & if you face same problem then
2. You need to visit camera repair shop and they open the camera completely and clean all the inside part of the camera. because you need to clean the moisture inside of lens, viewfinder & sensor too.
So only hope in sunlight. If its solve then fine.
A few suggest about this problem. First in manual or auto focus mode does the green in focus confirmation light come on in the lower right corner of the viewfinder? Are you shooting in One Shot-AF, have you selected an Auto Focus Point are your pictures in focus? I know you've been using this camera for 2 years and these questions you need to ask yourself. If that green confirmation light comes on then the picture will be in focus. a few things that will mess up focus are little or no contrast. No contrast like huge expanses of water, sky, glass or infinity will render a auto focus system near useless. Something that is good is that you haven't said anything about error codes which is good. These questions my sound lame but ask yourself this when was the last time I cleaned the lens (Front Element) use a lens cloth for this and huff on it if a little moisture is needed. Do you change lenses often and when was the last time you checked your sensor for dirt? If you have had the lens off you should check the rear lens element for finger prints or oil. A dirty rear lens element will cause everything to look as if it's shot in a dream world. Check your camera sensor buy taking a (manual) focus shot of a piece of clear blue sky download it to the computer increase the size to 100% and check out the blue for dirt. A camera that's two years old and used "normally" may need the sensor cleaned. But go back to this infocus light if it's coming on and the pictures are out of focus then you have another problem as in dirt. Hope this was a little insight into your problem
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.
Firstly, to isolate the shutter as the problem, turn the camera on and the flash off. put the lens into full optical (not digital) zoom. Then turn the camera lens to face you and look at the lens and take a picture.
With the camera in full optical zoom the shutter assembly will be right up to the outer lens so you can see it clearly. When the button is pressed you should see the shutter fire across the lens inside. It should cover the lens completely. If it does not or doesn't fire at all then you get over exposed pictures or lines across the photo. The most likely cause for this is moisture residue on the shutter leafs sticking them together.
To clean you will need to strip the lens down almost completely to access the shutter assembly. If this model of camera uses a sealed shutter unit then it will be impossible to clean. The only models i have found so far that use a sealed unit are the F460 and F470. Yours I am not sure of as I haven't opened 1 up but the solution for most is to strip it down and clean.
Tip: use another camera to photograph each stage to help on re assembly
There are three possible causes for an hazy picture:
1. The lens is fogged:
Sometimes when you come out of an air-conditioned room, the camera is exposed to a sudden change in temperature. This causes a temporary fog inside the lens housing. If you snap a picture through this foggy lens, the picture will not be sharp and can lead to unwanted color casts on the picture. This situation can be avoided. Someone in a photography forum stated "Before going to the outside, put the lens in a ziplock bag and leave it outside till the body temperature of the gear changes to the outside temperature. When it does, take it out and use it, this way it will not fog up because there is no sudden change (to the gear) temperature wise."
2. A possible fungi on the lens surface:
When you use the camera in damp environments, there are a lot of chances of fungal growth on the lens surfaces. Fungus is a living organism that sometimes prefer to make your lens as it's home! Moisture supports its living and their presence really affect the image quality. You can avoid fungal growth by adding a small bag of Silica Gel to your camera bag. Silica Gel is a good absorbant and will absorb any moisture in the camera bag. But do regularly change the Silica Gel with a new pack. Do not store your camera inside a leather casing if you don't have to. Leather is a good material that can preserve the moisture. Always store your camera in a dry place.
3. Dirty lens:
Obviously you know the solution for this!
Just make sure you use only a piece of leather to clean the lens. Leather will not scratch your lens.
As for the blue cast on the pictures, it is the ultraviolet rays that casts the unwanted color. If you live in a sunny weather, this is not unusual. UV filters will solve this issue and is cheap too. UV filters also act a lens protector!
I think your camera has a diopter adjustment. If it does, it'll be located on the right side of the eyepiece. It's a small wheel with a + and -. Adjust that until the image is clear. -or- It's possible that it is in need of cleaning. If you plan to remove the focusing screen, be exceptionally careful not to scratch it. Has it been subjected to extreme moisture conditions?