Andy, I have only hunted with the 4k one time, last night. The night view seems to be too white or essentially foggy with little contrast. I couldn't seem to adjust it any better. Maybe the lens cap deal might help?? I like the scope otherwise.
UPDATE: Tonight I played around some more with the 4k and the TR-38 illuminator. Distances varried from about 40 yards to maybe 70. It looked pretty good, better than last night. Maybe my sleepy eyes were to blame. Time will tell.