RFT telescopes

Would an Orion xt4.5 qualify as a rich field telescope? What exactly determines if a scope is an RFT? Is there a technical definition, or it simply a family of scopes that excell better at showing wider fields?

The age-old definition is a telescope that has an exit pupil of ~7mm, or a magnification of about 1.43x per centimeter of aperture or 3.62x per inch. A wide AFOV eyepiece is mandatory. So at 36x, 3mm exit pupil, your xt4.5 does not qualify. Ron Oehlert