Yes the are I.F. They are the United -Kunming series BA3 series and are rebranded and sold by Oberwerk, Garrett and Andrews and numerous others at basically the same Hi. specs. There are multiple postive reviews on various other sites on these binos esp. on Cloudy Nights. They are heavy at 4.5 kgs. I have my 'generic' versions on a H.D. 7 ft. mount with a crank which costs more then the binos. There true aperture is 98 mm. The Andrews 100/45* BT [again Kunming-United] with the changable E.Ps. which I have also measures 91mm but are optically superior as they are triplets. There is some minor / moderate CA fringing with the 2x100's on bright objects, there is curvature of field from about 70% -80% out but they are impressive cost effective binos esp. on dark skies. Just be prepared for a sore neck !
http://www.united-optics.com/Product...A3_Series.html
Chris