To the people that say "rifle" type bow sights shorten the shooting radius, just picture whats getting lined up. Ultimately, your eye is getting lined up with the front sight no matter what type it is. Unless your eye moves closer for some reason, the shooting radius remains the same. In fact, a longer sight radius is possible with "rifle" type sights because you do not have to anchor. I could extend my arm/bow another 5" and thereforeincrease the distance from eye-to-sight 5".

Sight Radius - The distance between the front and rear elements of mechanical or “iron” sights. Theoretically, the longer the sight radius, the lower the potential for human optical error, hence the more accurate the system. This is true of open sights on longer barrelled rifles, which can have a long sight radius while still keeping the rear sight the proper distance from the shooter’s eye. If the rear sight is too close to the eye, it creates focus problems, potentially affecting aim ( unless it is an aperture or peep sight, which obviates the need for focusing ). For this reason bloop tubes are sometimes used on short-barrelled rifle to extend the sight radius.