Yesterday I noticed a white fleck on the Viewfinder of my 550 which I could not wipe off. Upon examination with a loupe I discovered that there are all kinds of particles (perhaps 25 of them) have collected on the inside of the viewfinder's glass, and a few specks could also be seen when looking through it from the front end as well. They cannot as yet be seen when looking through the viewfinder as they are basically invisible to the naked eye.
I wonder if others can check their 550 camera viewfinder under a loupe or magnifying glass to see if they have this problem as well. If so, there is a serious dust-sealing problem with this camera - at least within the viewfinder itself. Unfortunately, I believe this could potentially extend to other areas inside of the camera, posibly including the inside of the lens, as I do not expect that the Viewfinder chamber is a module totally sealed off from the rest of the camera's innards.
I am quite worried about this and intend to contact Pentax Canada on Monday to see what they will do about it. It does not as yet interfere with camera operation - at least at this point, as it is still only several weeks old, but it could potentially get serious enough where it could interfere in it's use.
As it is, the lens cover is so fragile that it does not provide a perfectly tight seal, and I have often found specks of dust on the front lens element as well.
I had hoped that a few people would check their cameras and posted replies before I contacted Pentax about my dust problem, but nobody has so far. But it's interesting that someone else posted a message this morning that he has some dust inside the lens of his 550.
Anyway, this morning Pentax Canada told me that there should definitely be NO dust inside the viewfinder or the rest of the camera for that matter. Although the Viewfinder is "almost sealed" from the rest of the camera, it is not a total seal - which means to me that if dust can get into the viewfinder, it can get into the rest of the camera's interior - including the lens and imaging chip. They have asked me to bring my camera in so they can remove any dust particles that are inside.
Basically, they told me that the only place I should see any dust is inside the lens cover, which is meant only as a protective covering rather than a seal from dust. Even then, they claim that any dust on the outer lens would only enter while the camera is being used. That one I don't buy, as the lens cover is very flimsy and can easily be accidentally spread open while the camera is turned off.
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Then you learn, when everything works fine, dont mess with it! Have a look at the gold pins that rely the body to the lens. Also check that your lens manual switch focus is engaged... Try a friend lens to see if its your cam or the lens...
You need to clean the projector. Take of the filter and clean it, open the topschell of your projector and clean it.
In time a projector collects a lot of dust inside, if you dosenrt regulary clean the filter the dust pass it and stucks inside the projecotor. Use compressed air for the job but be verry verry carefull so you dont damage anything vital. If you arent sure how to to it i sugest you take it to a electronic repairshop, its cheap and they will clean it properly.
There may be a dust fleck on one of the LCD screens inside your projector. I had a similar problem and managed to clean it. But it requires you to dissassemble the entire projector !!!. If you are not technical, don't do this yourself. !!!
sounds like the LCD screen viewfinder may have been twisted or accidentally catched or got hooked or snagged on on something at one stage and pulled something, if the screen went yellow it means the three wires going to it are possibly broken or the small white clip was slowly coming undone inside the Viewfinder for the red and green to no longer work to complete the image also indicates why the buttons on the viewfinder are not responding, try twisting the viewfinder very lightly whilst on, but most likely the small white clip holding the wires has come off at the elbow inside the camera
For me the issue was flecks of dust on the CCD. Complete fix for d40x effected as follows:
(You will need a 'rocketblower' or similar air cleaning device)
Take the lens off. Set camera to Manual setting and spin around to 'bulb' setting, press the button to shoot but hold it down. You will see the CCD exposed inside the hole where the lens usually attaches. Then taking care not to touch the CCD with the rocket blower give it a few blasts of air onto the ccd. (Possibly before you do this hold the camera at an angle to the light and you might see the dust flecks I had on the CCD.) Then replace let the button go and replace the lens. Voila.
I bought one a year ago and never thought it work well in cleaning the air. I get more dust on my counters than collects in the pure-ion. I recently got a letter from an attorney saying they are settling a class action suit on these purifiers because the are not effective. I called brookstone and they said they will refund my money because of the law suit. Good luck.