I've had my D200 for a while now and just ran into my first trouble spot as the weather has heated up. While outdoors in bright sun, the monitor cover "fogs up," but not in the normal way as when you get breath behine the cover - more like a purplish discoloration in a horse-shoe design from the top of the cover down on each side. The effect is like the plastic has overheated from a flame too close to it.
When this first happened, I was afraid it was the LCD, but when I popped off the cover everything was normal. Clearly the cover was being discolored. After a while, indoors, the discoloration went away. Today I noticed that this does not happen indoors or with flash indoors, but outside it's happened a few times.
>>are you, by chance, wearing polarized sunglasses?
Not such a daft question. What comes to my mind too is the possiblity it is some form of stress pattern in the plastic due to the combination of it's manufacture, design and ambient heat.
Take the camera out into the conditions that noramlly cause this issue. Don't use the camera or put it to your eye. If the stain reappears in exactly the same position then it can't have been from any other source than heat and stress. If the stain does reappear remove the cover from the camera but leave it at the same temperature. If the stain disappears then it must be due to heat deforming the plastic and adding extra mechanical stress to the plastic. If the stain doesn't disappear after the normal 10 mins then the cause is purely the heat and some possible chemical imperfection in the plastic.
Either way it sounds like you need to get a new cover or swap over to using a hoodman.
I don't have the answer to solve this mystery but I did want to add a friendly warning. Now that summer is on its way be very careful when using your D200 and bug spray or sun screen. I ruined the LCD cover to my brand new D100 a few years back when I accidentally rubbed OFF! bug spray from my skin onto the plastic. It fogged up permanently. I had to replace it, there was no way to salvage it. Apparently, there are solvents in these products that will melt plastic. I learned the hard way.
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>I don't have the answer to solve this mystery but I did want >to add a friendly warning. Now that summer is on its way be >very careful when using your D200 and bug spray or sun >screen. ... Apparently, >there are solvents in these products that will melt plastic. >I learned the hard way.
DEET is the usual culprit. ANY product containing this insect repellant will etch most plastics used in camera bodies, opaque or clear. It only takes a small amount on your skin to cause permanent finger or cheek prints on plastic camera bodies and LCD covers.
It certainly sounds like a stress pattern. As the body gets warm it will expand much more (in relative terms) than the plastic LCD cover. That may well be putting pressure on the cover. Now AFAIR the LCD display is actually a source of polarised light which will make those stress patterns even more obvious(school physics creaking a bit here). I wonder if a few minutes with some *very* fine sandpaper applied to the top edge of the cover might shave off a mil' or two and make all the difference without actually making it loose?
"Mine eyes are made the fool o'er the other senses or else worth all the rest"
I replaced the monitor cover and went out today to do some shooting at a historical site. Absolutely no problem with the "fogging" I found previously. It appears that somehow the old cover did get "stressed."
The strange part is that it was not cracked in any way, nor am I aware of banging it. Maybe this thin piece of plastic is more fragile than I expected.