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No real changes here compared to the older Sony, so only minor rewriting: The VPL-VW665 ES offers two speeds of (creative) Frame Interpolation. In addition it offers several options which relate. The image here shows the MotionFlow (as Sony calls it) options.
Interestingly Smooth High, Sony indicates is best for working with typical 24 fps content if you want smooth motion. I am not a fan of using "smooth motion" with 24 fps movies, but I must admit it wasn't bad, Low was even less noticeable. Oh still a touch of "soap opera" or live digital look to the movies, but not bad. Some of you will like it, it's a personal call. I won't use it normally.
I used the Smooth Low setting for the football (and some hockey) that I've recently watched. It works well enough. There are always detectable artifacts around the fast moving objects with CFI, but on this Sony, not normally noticeable (to me). I'm one of those who likes having CFI for sports mostly, but generally figure it's a feature that most can live without.
There's also a mode called Impulse, and one called Combination. Combination should be a very viable compromise mode, it is a little brighter than when engaging Smooth High. I'm not up on the tech, but it may have to do with whether black frames are used in between the regular ones.
One comment which I'll repeat on the performance page when I discuss image noise. This Sony VW665ES projector like all the other Sonys I've reviewed in the last few years has an achilles heel. When the camera in a typical movie is panned at one very specific slow speed, the Sonys show more bouncing of the image than any other projectors I've worked with. The movie I alway see this in, is Red (with Bruce Willis), near the beginning with a pan of the neighborhood in the first chapter. I just wanted to point out here, that using the Smooth Low or High setting almost completely eliminates that extra judder. Better if it wasn't sensitive to that one panning speed, but at least it can be corrected. Of course, to do so, you are watching with CFI engaged. Hmm!