Olympus fail to specify what glass they use to make the prisms with, this for me is a concern as on their higher spec models, they clearly state that they use BaK-4 Glass. However as I have not looked through the Olympus or compared them I can’t be completely, but it is something that I have often witnessed with similar types of comparisons. In the first thread a purchaser found that the size of 7x35 sweet spot and the level of deterioration of the image outside it were OK for his use on the night sky which is impressive. We used this binos in Kalpa to watch snow peaked mountain as well as used in Bharatpur bird sanctuary the quality is amazing. I think we naturally ignore out of focus images at the edges of our view anyway, and for visual observation it makes very little difference; astrophotograhy is a totally different ball game and out-of-focus pictures are very obvious.

I mainly interested in looking at constellations and larger asterisms, so the wide angle seemed to suit my needs. I was looking at that size on their info sheet and noticed that it had over 9° FOV , but maybe the reduction in aperture would reduce the brightness? Protection from UV RaysYour eyes are prone to harmful UV rays of the sun, especially while bird watching or terrestrial viewing.Enjoy outdoor adventures with the Olympus 8×40 DPSI Binocular and treat your eyes with great viewing experience. The large focus wheel and intuitive, ergonomic controls means it’s quick and easy to adjust even when wearing gloves. Worse than that are simply coated or as Olympus describe theirs as having a “Monolayer coating” – this means that only SOME surfaces (they don’t say how many, but it is usually just the first and last lens surfaces) have received just a Single anti-reflection coating. Does the Pentax SP have better fov edge sharpness than the Olympus, and what sort of field of view do you get? It's likely that no further discussion is required, in which case we recommend starting a new thread.

Two 8x40ish porros that offer some level of water resistance from Bushnell are the Legacy WP and the H2O models. When viewing from a fixed location and there’s a need to close-in on a subject, check out the powerful zoom of the 8-16x40 Zoom DPS I. Also, these binoculars have maximum image brightness and built-in dioptric correction that adjusts to your eyesight. These, like the anti-reflection coatings require specialized skills and equipment and so cost more money to apply and so are often omitted from cheaper roof prism models, which result in them having lower resolution image with perhaps less contrast. Coated lenses and prisms coupled with aspherical lenses ensure a high level of optical performance with minimal distortion and fringing, while a focussing distance of as near as 4 m allows you to follow birds and other wildlife without moving as they approach.

My partner had a Nicon Prostaff with same lens parameter in our Safari holiday and I honestly couldn't see any difference. Their traditional Porro prisms and anti-reflection coated optics maximise the light entering the 40mm objectives to produce bright and clear images with a rich depth of field. I think that is very sound advice as the Bushnell's have a solid reputation; my sister had several Olympus 35mm cameras over the years and I always liked their design philosophy which I why I made the purchase.