I had to compare the Olympus 8x40 DPS-I with a Nikon Action 8x40 CF. According to my findings in a variety of lighting conditions, the optical properties of the two glasses are practically classified as almost identical. From the feel of her has better promised me the Olympus just a tad bit but that's certainly very individual. Apart from the Olympus was more favorable and the decision as to me is easy. Both binoculars are well made, fit comfortably in your hand and feel wertig, nothing wobbles or the like. Now for the optical properties (applies precisely to both glasses): -gestochen sharp, clear and bright image with clean colors Although -the sharpness takes toward the edge visible from, but this is not really disturbing, because the eye anyway can just focus on the midfield and this leaves no wish unfulfilled -dafür you with two glasses a very large field of view 143m at 1000m, other glasses have since significantly less and can thereby naturally often easily come up with less edge blurring because of the blurred area is not visible or cut, for the visual impression is me because a larger field of view but clearly rather, it gives a completely different impression of width -The focus works very smoothly and with absolute precision, and that's really nothing for granted, as I discovered in some other glasses similar price range -in dusk there are certainly much better binoculars (8x56 or 9x63) but for an entrance lens of only 40mm you can still surprisingly well even in low light
As a comparison, I had two more binoculars from other manufacturers, but in Roof construction, available, which were a bit more expensive than the Olympus and about same price as the Nikon. These two roof prism glasses were of high quality, especially from the optical quality, comparable in any way with the two Porro glasses of Olympus and Nikon. The picture was not nearly as clear and bright and the focus was hinzubekommen significantly more difficult and had somehow always feel not find the optimum focus point correctly. I would say that the Olympus and Nikon in the proven Porro construction are comparable in image quality with roof prism glasses for you significantly more money, probably must be a multiple, spend! This is just simply the fact that at the Porro construction considerably less qualitative requirements are necessary on the installed prisms / lenses to produce a good picture than with the roof prism design. This of course is reflected in the price.
All in all one can say that the Olympus is an absolute bargain at this picture quality!