received these and tried them out briefly during the day where they seemed to focus just fine. I waited until it got dark and found that they couldn't focus and only had a little over half a turn stop to stop on the focus wheel. I was about to pack them up for return but examined them first and could clearly see there was room on the focus wheel for more travel. I just applied some firm force to the wheel and it freed itself to continue turning 2.5 full revolutions. It seems that for daytime viewing with the cap on (with the small aperture) the focus range is smaller and there is a dimple on the focus wheel. Night viewing requires focus beyond this indentation. It seems that my indentation was quite stiff at first and took more effort than expected at first. After repeatedly traversing that indent point, it now moves smoothly and still provides a stopping point. This could be avoided with quality checks making sure this path is clear and also a better explanation in the manual under the focus wheel description. After that's done, I'm really impressed. They work pretty well. One concern I had that no one seemed to ask or report was IR light visibility. The IR light it emits is invisible when you look into the illuminated view. However, if you look directly into the light, it glows softly red, but it's not relevant at all. There are 7 levels of IR illumination power. At level 1 you have to hold it in your hand to see it. At level 7, it's still just a soft, non-obvious red glow that's not easily discernible beyond 10 yards. I walked out about 70 yards and then walked back (in the dark) had only an idea of where the light was and looked hard for it and didn't find it until 20 yards. I backed up until I couldn't see it at about 30 yards. This was outside at my archery range, so these distances are accurate. IR performance at level 1 is good for clearly seeing objects up to 30-40 yards. If you use higher power, objects will be overexposed and objects will be washed out. Level 7 seemed like too much at 70 yards. I have to go to another field to test it at 200 yards. So if you are using the correct IR illuminance level I would say the red glow is by no means a problem. Use a low power setting for animals that are close by and they will not see you, and long range animals will not see the high power IR setting either. The viewfinder has a rubber protection that adapts to your face. If you wear glasses, this rubber shield kind of sucks, but it's removable. However, if you remove it, the screen's backlight (even on a dim display) will be reflected on your face, which you can see (it really scared my horses). Since I generally wear contacts, this isn't a problem for me, but maybe for others. I just went out and got some good pics of my horses at about 50 yards on IR level 1 and am very impressed but when I try to upload these pics to my computer the drive is not recognized. However, this may be my PC fault as this is an old one in my workshop. I'll fix that later as I've already spent way too much time on this review. So yeah, once I figure out the focus issue I'm pretty happy with it. Edit; Added photo of horse at about 50 yards on a dark moonless night. But he is a light gray horse. I walk up the street to find a black horse in the dark and see how this works. Even a newer PC does not show the SD card as a drive when connected directly to the NV device. The SD card can still be read by removing it and reading it directly.