A friend of mine and I did some side-by-side first impressions type stuff at the range yesterday. We did not have much time, so all the side-by-side evaluation was done at 20x. The scopes we had with us were Deltra Stryker HD 4.5-30x56, Athlon Ares ETR 4.5-30x56, Athlon Ares BTR 4.5-27x50 and Vortex Vortex PST Gen 2 5-25x50.
In general, if I step back and think of the state of precision optics 15 years ago, none of us have any reason to complain today. We are all just spoiled rotten.
With that out of the way, there is a clear difference in color cast of the scopes which will effect how you perceive things. PST Gen 2 has a slightly warmer color cast, so if your eye likes that, it will look more contrasty. That having been said, Gen 2 PST does have notably better contrast than Gen 1 did and is generally a much improved design.
Also note that two scopes have 50mm objectives and two have 56mm objectives. We did the testing in the middle of the day, so exit pupil differences have minimal effect.
In terms of resolution, Delta was better than others. Stryker HD > Ares ETR >= PST Gen 2 > Ares BTR.
Contrast: Stryker HD >= PST Gen 2 > Ares ETR > Ares BTR
Chromatic aberration: Stryker HD >= Ares BTR > PST Gen 2 > Ares BTR
Distortion: all about equal at 20x, but I will look more carefully at other magnifications as I do the testing.
FOV: PST Gen 2 > Stryker HD = Ares BTR > Ares BTR Ares BTR FOV looks smaller than it is.
Other general impressions:
-Ares ETR is easily the best precision scope I have seen come out of China to date. It is almost as if they took apart and LOW's reference 5-30x design and reverse engineered it with some minor changes to the objective design in order to account for manufacturing complexities. That's not a bad way to go if you are looking to make a precision scope.
-The tiny center dot in the Ares ETR will take some getting used to. Then again, this is what I said about the EBR-2C reticle as well, since I do not like aiming with an open space. I got used to that, so we'll see how it goes with the ETR.
-In general, I am used to dissecting the target, so the Ares BTR reticle works really well for me. With the aiming dot, I prefer something a little larger. Of the reticles we had there yesterday, as far as the primary aiming area goes, I really prefer the Delta reticle. In general, if they moved the numbers to the outside of the tree, the LRD-1T reticle would be just about perfect for my purposes. It will be interesting to see how it looks side by side with Gen 3 XR. The center dot on the Delta is 0.045 mrad, while on the Gen 3 XR, it is 0.075 mrad (ETR has 0.03 mrad dot). Generally, I seem to do well with the aiming dots in the 0.05 to 0.1 mrad range, so Delta is on the low side of that and Gen 3 XR should be smack in the middle. However, without seeing it in a scope, it is hard to tell.
I will spend more time with the scopes side by side in different lighting conditions and check the ETR tracking (the other scopes I have have already been checked).
ILya