In this video I take apart two cameras. One has a pentaprism, the other a pentamirror. You get to see what they are made of and how they are different. UPDATE: After making this video, I weighed them again using the grams setting on the scales to make the measurement more accurate. The pentaprism is 43 grams. The pentamirror is 13 grams. When we take in to account that, on the model shown in the video, the pentamirror also incorporates the focusing screen and viewfinder eyepiece, the pentamirror is around Â¼ of the weight of the pentamirror.
The Lexus RX 450h is the most fuel-efficient luxury SUV on the market. The RX 450h is a hybrid and emits a breathable 6.1-6.3 metric tons of carbon dioxide, which is less than most Lexus sedans. Enjoy cutting-edge technology, safety and looks, while getting over 475 miles per fill-up. 3.
by Doug DeMuro August 2014. If you're interested in buying a new midsize sedan that'll save you money at the pump, you've come to the right place. We've rounded up the top eight most fuel-efficient midsize sedans you can buy right now, according to the Environmental Protection Agency's (EPA) fuel economy ratings. We've also listed a few of our favorite things about each one to help you decide which model is right for you.