Firstly it is another indication of a bins class and secondly, remember that as well as liquid and moisture, it will prevent dust and other tiny particles from being able to get inside and potentially spoil the optics and your view. The way shippers handle packages these days, who knows what kind of trauma the binos may have been subjected to in transit, despite the binos having a sturdy build. Telescopes with larger optical diameters collect more light, which leads to an increase in brightness and image resolution compared to smaller instruments. APM is a good company but sometime delays in transmission but APM always tried best and I am glad that it resolved the situation nicely per OP's statement.

So as you would expect this is far narrower than a more standard 8x or 10x bin, that can have a FOV more than double than these, but compared to other high powered bins, they compare rather favourably and far better than the 25x70 SkyMaster's Also worth noting is that the FOV on these will be much wider than that on almost all home telescopes, which is why astronomy binoculars like these are ideal for scanning the sky before using your telescope to get closer to what it is that you want to see. All Echelon series bins, including this model use a individual focus system which essentially means that you need to focus each eyepiece individually by setting the diopter, which simply means turning the eyepiece.With a pupillary distance of 16mm, the eyepiece construction is still suitable for people who wear glasses. I can totally understand how stressful it must be to receive a gift which has problems and feeling sorry for the wife who tried so hard. If you happen to wear eyeglasses and wish to observe with them on, eye relief becomes very important.

The eye-relief is really long, which for those who wear glasses whilst using bins is really important and their field of view is pretty good and up there with other 20x binoculars. Due to the fragile nature of the items we supply, all products are securely packed with filler and bubble wrap to prevent breakages. I was not too sure about the individual focus, but at that magnification it seemed to be a non issue. Multiple layers of coatings are even more effective; the term "multi-coated" means one or more air-to-glass lens surface has multiple coatings. Because you have to adjust each eyepiece separately, it does take a little longer to focus on closer objects than most "normal" binoculars that only require you to turn a single often centrally located focus wheel that adjusts the focus on both eyepieces simultaneously.Our glass is completely protected against rain and immersion in water, so it is completely weatherproof. It's likely that no further discussion is required, in which case we recommend starting a new thread. It was my fault for not checking, and reading carefully the original post, and just assuming that it was another cheap Chinese 70 mm binocular, when it is actually Japanese and according to the claims, assembled in the USA. Plain Square Edged (PSE) Timber is a high quality, machined square edged piece of timber which is perfect for jobs where a clean and smooth finish is required. The APM ED APO 10 x 50 binoculars is classed as offering IPX-7 protection, which means it will resist 30 min in up to 1m depth of water.