1. | Jan 22, 2014

Dave,I really love our tips. I have been doing TV ptrudcoion a long time and I always learn from you. I do appreciate the way you break things down into understandable chunks of information.Nearly 190 years ago Agustine-Jean Fresnel developed the multi-part lens. He was a unique individual. Today, we might think of him as ADHD, put him on drugs and in a special class and the Fresnel lens would have never been developed. The lens was first developed for use in lighthouses and they still are used for that today. It is not unusual for a 12-foot Fresnel lens with a thousand watt lamp to be seen 20-to-25 miles out to see. That is amazing.Because the lens (and the TV light we use that has that lens) is named for Fresnel there are two things I hope you will realize. First, he is French and in pronouncing his name the S is silent and the emphasis is on the second syllable of the word (pronounced fru-NEL). Second, because the lens is named for a person it is always capitalized.Again, thank you for all you do.Ken

2. | Jan 3, 2014

It's great to find an expert who can exlaipn things so well

3. | Jan 2, 2014

Hello 6ngoor!Unfortunately I cannot is proepr write here the text in the Arabian language, the reason to me is unknown. I very much ask you please look messages for yours account on youtube, I already long time have sent you the message in the Arabian language where has specified the reason for my request back. I shall be very glad, if you can answer, even something.With greetings