ATN 4K Pro

Edosan, I have 2 of the 4k 5-20 pros. The pro to going with the higher power, is pixelization is minimized due to higher base magnification. The biggest thing I have found is that focus is utmost importance. If I ever have any "grainy" videos, its usually caused by it not being in focus perfectly. I have recorded video at 20x and it is as clear as base zoom. The sensor in them is an actual 4k sensor, they do this so that when you do zoom in there is no degradation in video quality. Is it a true 1080p video at max zoom? Its close enough that I can not tell if its less than 1080. So I would say yes, go higher power. 
 
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My experience with the 4K Pro is the clearest I'm getting is provided at base magnification. Anything above 10x started to introduce pixelation. By 15x it was hazy and at 20x it was terrible. This is not the fault of the optic rather it's what happens with digital zoom. 

Same thing happens with a camera that has digital zoom. How digital zoom works is it increases the size of the pixels. Double the size of the pixels and you just doubled the magnification. Problem becomes with too much digital zoom, the pixels become large enough that the image suffers by way of decreased resolution.

I have a couple of videos where I use higher and even maximum magnification with the 5-20x model. You'll see the effects on the image at the higher zoom levels.
 
When I look at any digital optic, I don't even consider digital magnification, only base magnification. You might get some limited use out of 2 or 3 zoom levels, but that's about it. When I hunt, other than bait setups, birds or critters, I remember the words an old hunter once told me: "Your greatest challenge will be to see them." For that reason, I almost always choose FOV over magnification. I not only need to see them, I need to find them in the scope to make the shot.

Me, I went with the 3-14 4K pro OPMOD version from Optics Planet for around $562. I did not want to pay more for a better IR illuminator, because I have better already, and don't even want the one that comes with it. The OPMOD version gives me the battery pack but more importantly, bumped the warranty up from 2 years to limited lifetime. In my case, I have an array of NV and thermal options, both scanners and scopes, and my need for this scope is very specific. I may add the ABL 1500 range finder in the near future. I know that depth perception at night is one of the biggest issues in night hunting. While I would likely never shoot at that range especially at night, it would be nice to know how close I got them. I already have a Burris Eliminator III with built in range finding/ automatic ballistic/reticle compensation, but it is a day scope only. With the addition ot the ABL, the 4K pro could do the same to some extent, both night and day.