Quote:

Originally Posted by

**MIkeDuke**
Thanks for that great explanation Craig. It was very helpful. I was thinking of a 70in **2:35** screen to be honest with you. I think while it would look wide, the lack of height, when compared to a 16x9 screen would work in my favor. The only things that I watch that would not be **2:35** are TV shows like Deadwood. That is **1:77**. But I could live with how that would look on the projector.

I assume that **1:77** is still some sort of wide screen aspect ratio. When I watch that, or **1:85** or standard **1:33** content on a **2:35** screen, that's when I would get the black bars on the side of the picture right? Are there any circumstances that would cause the "letter boxing" to appear like it does now on my TV? You know, top and bottom if I use a **2:35** screen? Now I would most likely use this for movies and barely use it for CATV.

Mike,

I just want to clear something up... maybe you understand this and are just using the terminology incorrectly, but I just want to be sure you really are understanding this.

I've bolded and changed the color of all the "ratios" in your post. These are not correctly stated. You have placed a colon where you should be placing a decimal point, (a period.) There is no such thing as a "2:35" aspect ratio. The aspect ratio, (AR), is the ratio of width to height. A "2:35" AR would be 2 units wide for 35 units tall. IOW, a 2' wide screen would be 35' tall. Obviously, that's not what you're referring to. What you mean is a 2.35:1 AR, (that's 2 POINT 35 to 1.) That would be 2.35 units wide for every 1 unit tall. IOW a screen that is 1' tall would be 2.35' wide. A screen that is 10' tall would be 23.5 ' wide. When you use the projector calculators that I previously linked, and you select a 2.35:1 AR, the calculator automatically calculates screen sizes and they are always in a ratio of 2.35 units of width to 1 unit of height. For example, a 72" 2.35:1 screen is 66" wide and 28" tall. Divide 66 by 28 and you get... 2.35. So that 72" screen is 2.35 "units" wide for every 1 unit it is tall, (or it's 2.35:1.)

The same is true for 1.78:1. A screen that is 1.78:1 is 1.78 units wide for every 1 unit it is tall. However, a screen that is 1.78:1 is also a 16 x 9, (or 16:9) AR. (Divide 16 by 9 and you get 1.78.) So, if a screen is 1.78 units wide for every unit it is tall, that's the exact same as saying it is 16 units wide for every 9 units it is tall. If you go to the projector calculator and select a 16:9, 72" screen, you get dimensions of 63" wide by 35" tall. Divide 63 by 35 and you get... 1.78.

1.78:1, (or 16:9) is the standard aspect ratio for HDTV. All flat panel TVs are 1.78:1 in their "native" aspect ratio. All HDTV set top boxes are 1.78:1 AR's. BluRay is 1.78:1 or 16 x 9. Many of these devices can also do other AR's, such as 4:3, or 2.35:1, but they do those other AR's by either stretching the image or by adding "blanking", (black bars.)

As I said, you may have understood all this and were just using the terminology incorrectly, substituting the colon for the period. If that's the case, then all you need to do is to begin using the terminology correctly.

However, if this sheds some new light on your understanding of this stuff, you may want to go back and re-read my post from last night. It may make more sense to you now.

Craig