Boomer said:
As shown in the pics above, the ghost ring is a peep sight with a very thin rim and about a quarter inch aperture...
This is for the most part correct, however I'd like to add a few comments.
A ghost ring, and a peep sight, although although both are aperture sights, are somwhat different. With a peep sight the hole is much smaller (basically a pinhole) and you shoot with your eye held much closer. Because you are looking through a small hole, everthing you look at is in almost perfect focus (the sight at the end of the barrel and the target as well), and as with a ghost ring, you don't pay attention to the rear sight. Also, with a true peep sight, at the front of the barrel you generally look through a globe (which will remain in focus) with a larger diameter hole in it with which you basically surround your target (also in focus). (in some cases it can be used with a post, but it seems to work better for most with a round hole...)
Here is an excellent article on types of "iron sights", including a great explanation and pictures of both ghost ring and aperture sights.
http://en.wikipedia.org/wiki/Iron_sights
Boomer said:
...It is simply the best metallic firearm sight available. The reason it is superior to other types is because the human eye cannot focus on three points at once - something must be out of focus - rear sight, front sight or target. When you look through the ghost ring at the front sight and target, the ghost ring blurrs, or ghosts, and can be ignored. You simply put the front sight on your target and fire. It is very fast, and very accurate. When the front sight - and we must always concentrate on the front sight - is on target - as long as it is within the aperture you will get a hit. As an interesting demonstration, put your rifle or shotgun on a solid firing position with the front sight on your target. Now move your hear around keeping the front sight within the aperture. You will see that the front sight stays solidly in place regardless of where it appears within the aperture and does not move from the target. As long as the front sight is within the aperture you will get a hit...
I agree, other than the part about where to focus. In this case it can be used a little differently that a regular partridge sight...
Boomer said:
The ghost ring is not as useful for use on pistols. Firstly, the rear sight cannot be brought close to the eye, and secondly because the sights are so close together that they can be kept in focus, while the target slightly blurs.
Well, I guess everyone has an opinion, and in this case mine differs from Boomer's.
I have ghost ring sight mounted on my Ruger MKIII Hunter and I love it. A ghost ring is
designed to be used far from the eye (unlike peep sights), and because of this lends itself very well to use on a pistol. Additionally, you can control where your focus lands, so if you prefer to focus on the target, you can do that, since the front sight will still remain in focus enough to use (remember, you only have to center it in the rear sight, it's not nearly as fiddly to use as rear partrige sight). Even if both the ring and the front sight are slightly out of focus, they are still more than visible enough to do their jobs (much more so than with open sights for some reason...).
It's kinda hard to explain until you've tried both. I bought a ghost ring for my Ruger after having used a peep on my Brno model 4 target rifle. They're both much more fun than any scoped gun in my opinion!
Check out my ghost ringed Ruger:
The pic below is a little out of focus because I shot it without the flash and I was shakey...