Sometimes I get bored and answer questions on the Nikon USA forum:
Is there a monitor cover which will work with the D5100? I am thinking of a cover similar to the BM-8 that came with my D70.
The 5100 has a flip out LCD, so there is no need for a monitor cover. Instead, just flip out the LCD, rotate it, and flip it back in.
There are third party sites that make “screen protectors” which are thin films designed to protect the LCD from scratching. I don’t know how effective or useful they are since the glass or plastic used to protect the Nikon LCDs has improved over the years and quality varies from model-to-model. Plus, it is simply not very likely that a dSLR camera LCD will get scratched—dSLRs just aren’t often found in your pocket along with your keys a la iPhone
For instance, my Nikon D3 with a glass screen and no plastic protector doesn’t have a scratch even though I’m and outdoor shooter and have tens of thousands of shutter clicks. Similarly, my GF’s Nikon D5000 doesn’t have a scratch because it is easy to rotate the display to a safe position for storage and transportation.
BTW, avoid most “anti-glare” thin film protectors unless you are sure you know what you are doing. They work by frosting the film to scatter the reflection. However the material used in the frosting may be too close to the size of the pixels in the high-density monitors of a camera LCD. When that happens you end up being able to see the individual red, green and blue pixels in the display making it annoying.