A criteria I use now that helps to narrow down the selection: I will not buy optics (rifle scopes, spotting scopes, binocs, cameras and lenses) made in China.
This does mean that generally I will be paying more, but to me it is worth it.
I really appreciate the better side by side comparison rifle scope reviews on Youtube where the videographer does a good job filming through the lens of each scope, comparing and contrasting the lens quality and reticle clicking. These are few and far between unfortunately. It seems most of these reviewers try hard and mean well, but fail to use a proper camera attachment device, and the resulting video is shaky, blurry in the autofocusing, and eye relief is blacking out the image and flickering all the time.
The best comparison scope image videos for many brands I have found on YT is on the Optics Trade EU YouTube channel where they post reticle views filmed through the scope, and they always use a standard background:
https://www.youtube.com/c/OpticsTradeEU/videos
They do a really really good job, although it is always a single scope video, not a side by side view comparison. So the downside is that you cannot see brightness and clarity differences between scopes, and you never know if the background lighting is the same. I also notice that some of these videos have a fuzzy periphery, although its unknown if it is the camera or the scope that is responsible. I suspect sometimes it is the camera and its not the scope's fault. None the less, it is the best YT channel I have found to get a really good idea on what the reticle really looks like.
Idea for a DIY video mount to video film through a rifle scope: 2x4 of about 1-2 feet long with:
- Arca plate on the bottom center to mount to a regular camera tripod (with Arca clamp) that pans and tilts.
- pic rail mounted on top forward to attach scope. Tester needs a set of pic rings, and they can be cheap (1 inch, 30mm, 34mm, etc).
- Arca clamp mounted on top rear of 2x4, fastened through a hole in 2x4 that is routed wide left-right adjustment. This is so the eye relief of the camera mount can be adjusted left/right.
- Long Arca plate on camera so that camera can be slid back and forth to then lock at proper scope eye relief distance.
Design concepts for such an inexpensive device are limited only by imagination. I am guessing there are also commercial large aluminum mounting plates with numerous holes and slots to do this kind of multiple gear attachment filming.