Re: cleaning out dirt and dust inside nikon fg camera
FG's are pretty tough old cameras. You can use a cloth and a lenspen brush, but be very careful of the shutter curtain...its delicate and if you damage it you might as well get another FG ($30 or so on Ebay). My first Nikon was an FG-20...still works like new.
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You have some (dirt/ dust/ sand) clogged around the clearance between the shutter button and the camera body. If you are a DIY type of person, you can check and clean that dirt, other wise take it to a repair shop for proper cleaning.
The Nikon Coolpix 775 can be powered using a EN-EL1 rechargeable battery or a disposable 2CR5 type battery (Panasonic, Duracell, Maxell etc). If you are trying to use an EN-EL1 you may want to try using a 2CR5 - this would prove if the battery charger you are using to charge the EN-EL1 battery is working correctly.
You can also try and check if the contacts inside the battery compartment are clean - the camera is quite old and there will normally be some dirt deposits after that length of time.
It can be a piece of sticky dust or dirt on sensor surface which can't be removed with a blower or canned air. You can try to remove it by yourself with special cleaning swab and cleaning liquid. But this process requires some experience, so the safer way is to bring camera to service center where sensor can be cleaned fast and risk free.
This usually means your camera is not communicating with the lens properly. Inside the body of the camera - directly above the opening for the lens mount - are 7 square / rectangular pads. These pads are the electrical contact points, that when mated to the corresponding pins of an automatic Nikon (or compatible) lens, provides the signals to set / confirm f-stop, focus, etc.
Since this is occurring on several lenses, unless you're failing to
install the lenses fully into the body, the issue probably lies with the
camera body itself. There may be an issue with dust, dirt or oxidation on these contacts - or a problem inside the camera - that is interfering with the those signals. You can wipe these contacts with an alcohol prep pad in an attempt to dislodge any dust and dirt. Clean any lenses used on the camera as well - as dust and dirt on the camera contacts means it's probably been transferred to the lenses, too. Oxidation is a bit trickier to tackle - because the camera is wide open to collecting anything that drops into it. If cleaning with an alcohol prep doesn't solve the problem, I'd contact Nikon support for their suggestions or to arrange for repair.
If Alex's comment didn't resolve your problem, check for dust inside the camera body and on the part of the lens that goes into the camera body. The highlight indicator he speaks of will show on the LCD screen, but should not show up on your final picture once downloaded from the camera. Since the optics on that end of the lens are smaller, they are more susceptible to dust and dirt. If there is dirt or dust inside the camera body and you are not familiar with how to clean it, same yourself some headaches and take it to a qualified camera shop. You can seriously damage the interior optics of your camera by attempting to clean it the wrong way.
Your shutter will stick if it gets dirty or dust gets in the camera, a reputable camera shop can inspect the shutter, the sensor for dust & dirt and can clean it for you. If the battery is low while shooting the shutter can also stick on longer exposures.