I have been using the DNT4k a lot the last fortnight but almost mostly in daytime and in the last hour of legal deer shooting light. In those conditions, I have been super impressed. It is doing everything I wanted it to do with great clarity (relatively speaking) and ease of use, great LRF and Ballistic calcs etc and weighs very little.
However, last night I did the first extensive test in proper pitch black night. Conditions were perfect. The sort of conditions with lots of stars visible, not much cloud, low humidity and the thermal showed those lovely cold clean crisp images. There would be no excuses in these conditions.
It is clear this scope is miles behind my out and out night time shooting gear (which is a Vulpine Mk3, Solaris torch and March compact scope)
Don't get me wrong, you can still shoot in anger and ID stuff out to 250-300yds but the image is grainy and poor. If you like shooting on higher mag at night, it is even worse. In my view, x 6 and below is ok but anything above, whilst being usable, is really quite poor image wise. I was using a Solaris on various power settings and going through all flood to spot options. I used 4k and HD options on the Zulus. I used enhanced mode, natural modes, adjust focus and diopters and just could not resolve the sort of quality image at night that I have been used to for the last many years of night shooting.
The only benefit I can see of using the Zulus at night is that you have the LRF and ballistic thingy, so if you were shooting from a static point out the ranges where you need the holdover adjustments, then it will be functional. For literally every other scenario I would 100% be grabbing my Vulpine and March. I am not joking when I say it can resolve a better image at 400yds on x 20 mag than the Zulus can do at 150yds on x 6 mag.
If you want a middle distance day time pest control scope (out to say 350yds) and a last light tool for those wary/twitchy fallow without needing any additional IR, this scope is bloody awesome. At night however, I was very underwhelmed.
When I got home, I went on to Youtube and checked out lots of footage from DNT users and HIK Alpex users to see what sort of footage they were producing when recording fox shooting. You can see how grainy the images are and that most seem to be using quite low magnification settings. x4.5 mag at 30yds for rats looks awesome but as soon as you get out to 100yds+ on anything more than 6 mag, they all look pretty crap to me. I can only imagine the sensor set up that allows it to be so good in day time and last light, means it cannot cope under the cover of proper darkness. Maybe the new Nocpix and Alpex pro will sort this out.
So in a nutshell, the DNT4k is brilliant for daylight and last light but seems pretty pants, at least relative to what I am used to, in proper pitch black conditions. And from the footage online, the Alpex 4k seems similar if maybe slightly better. Neither are close to the ballpark quality of the Vulpine and optical scope combination.