Sig Kilo 10k Gen 2 Review Part II
Optics
Unlike a CRF that functions strictly as a range-finding device, we are talking about a binocular here, so, unlike the CRF, the bino RF has to excel in two areas, a one trick pony will not do. That is, you are not carrying just a ranging device, it is also your primary observation device, so optical performance is an important consideration.
While the 10k gen 2 is a class leading ranging device, the glass does not lead the pack, especially if you are looking at binos that absolutely prioritize glass quality like the the three alphas. That is not to say the optics are poor, but the optical performance is not in the same class as the ranging performance. That is, in fact, the major difference between the 10 gen 1 and the gen 2. While the ranging performance on the gen 1 is on par with the gen 2, the gen 1’s optical performance was well below it’s ranging class, in my opinion, falling below even what one would experience with the older 3k’s. This is due not to changes in sharpness or chromatic aberration, but due to issues with the coatings utilized in the first 10k’s. Whereas the 3k’s optics were very similar to what one would get out of, say, a Vortex Viper HD, the gen 1 10k’s had a very strong blue cast that decreased perceived contrast and brightness. In full sun, it wasn’t as noticeable unless you were comparing them to another set of binos side by side. But in lower and low light, it was very noticeable. I actually took the first set of 10k’s on a bighorn hunt and used them on several deer and elk hunts to see if it was something I’d get used to or whether it was a problem for me. For me, I never got used to it and, while I was able to find game, I felt it was an issue that really degraded the overall performance package.
It’s interesting to note that the 8k has the same cast, but as it is a CRF, whose only job is to range game that has already been located, it did not get in the way. But on the 10k, where it’s primary role is to find game in difficult lighting conditions, it was a problem. Sig recognized this as well, especially considering the feedback they got from the field, and went to work to solve the issue, which resulted in changes rolled out in the gen 2 version of the 10k. In my opinion, this is THE upgrade for the gen 2. So now, with the gen 2, the optics performance has returned to about what it was with the 3k, though I actually feel like the center is a little sharper on the 10k’s, but that could be sample variation or mis-memory. Like the 3k’s, one barrel is cooler, one barrel is warmer, so that as you look through both, you get a balanced tone. Center sharpness is really pretty good on my unit, but it falls off pretty quickly, with the edges being noticeably soft. In comparison, I noted the same through the Leica Pro’s I had on hand, but the size of the sweetspot in the center was larger on the Pros, and the drop-off on the edges was not as pronounced. Overall, using them over the last months, I found them to be pretty good, even down to the end of shooting light. I never found myself unable to see in those conditions, and though alpha glass will show you more, I didn’t feel like the 10k’s didn’t give me enough. Would I like alpha- level glass in these? For sure. But undoubtedly, that would push the 10k’s into a whole other price bracket. Compared to my FL’s, admittedly old optics but the best I have, the FL’s are definitely better n all categories, but not mind-blowingly so. I also compared them to the Leica Pro’s, which wasn’t as helpful as I’d have liked as the Pro’s are 8x’s…so the exit pupil alone gave it an advantage. On the other hand, the 10k’s had the magnification advantage, but yes, the Pro’s are optically superior. It’s not binos verses coke bottles, they are actually much closer than I expected to my eyes, but Leica prioritizes their glass and it shows. The 10k glass was good, but it is not in the alpha class, and as expected, though it is apparent in all light, the difference is most noticeable in low light. The thing is though, by the time the 10k’s fell apart for me, it was pretty well after shooting light. And that is a pretty good summary of how I feel about the 10k optics. They are solid and get the job done in an efficient fashion while lacking the next level refinement and performance of the alpha offerings. One final note, I spent many hours behind the 10k’s for many consecutive days while elk hunting this year and did not have any problems with eye-strain, something I am particularly sensitive to with my relatively poor eyesight and progressive lens glasses.
Even after long days of intensive glassing for elk, I never experienced eye fatigue and found the optics, if not extraordinary, to be pleasant to use and sharp enough to pick apart distant hillsides
So overall, on the optics, I would say we are back where we were with the 3k’s, maybe a bit better. This is a marked improvement over the gen 1 10k’s, giving us good optical performance that I found wholly sufficient and pleasant to look through, though lacking the kind of performance you would expect from alpha glass. That said, considering the incredible strength of the RF performance, this is one area I wish Sig could invest a little more into to more closely match the ranging performance. Of course, as I mentioned, the problem is that it would push the price significantly, as it’s not just as simple as switching out a couple of elements and maybe changing a few coatings. A lot of the design, including the prisms, would probably need to be addressed, which would likely push the price into the class of what alpha offerings cost, something I think Sig doesn’t want to do for this product. Adding another $750 to $1k to the price probably takes it beyond where many people can afford to go, and so shuts out much of the market segment they are trying to serve. My guess is that their product design parameters for their current bino RF’s target the goal of offering very respectable optics, though not top shelf, with world-beating ranging performance, allowing them to come in at a price more people can afford, and I feel like they’ve achieved that.
Ballistics
Like the 8k, the 10k relies on Applied Ballistics for their onboard solver, and indeed, there is no change to the gen 2 in regard to the earlier gen or the 8k. AB is generally considered one of the, if not the, gold standards for ballistic solvers and is used by an increasing number of manufacturers due to it’s excellent reputation. I won’t go into detail here as AB is incredibly dense and would easily fill up a review of it’s own. But the important things to note are that it’s fast and easy to set up your profiles on the app and then load them onto the 10k. After that, you don’t need to connect to the app for ballistics reasons unless you want to create new profiles or edit old ones. It’s very straightforward, range your target and you instantly get your solution, courtesy of the onboard AB elite solver. Of course, like the 8k and the original 10k, the gen 2 has onboard sensors for your atmospherics like temperature and pressure, as well as an inclinometer and an onboard compass. All told, together, the 10k can provide the onboard AB elite solver everything it needs in order to calculate a solution, no need for another device or connection to the app.
Wind
While the ballistics suite did not see any change, that is not the case with wind input. New to the gen 2 are three additional buttons that allow direct entry of wind inputs. Holding down the ‘W’ button brings you to a screen where you can use the other two buttons, ‘+’ and ‘-’, to set your wind speed. Hit the ‘W’ button again, and you are brought to a second screen that allows you to set a vector wind direction in the form of a clock.
Sig added three buttons to the 10k gen 2 to enable very fast and efficient wind value entry. While the optics are the biggest upgrade, the ability to input wind values directly is notable
It’s very reminiscent of what Vortex offers on their Fury AB, but lacking the ‘capture’ capability, where you just point into the wind and hit capture. Sig’s implementation is very easy to use and effective, despite it lacking the capture mode that Vortex offers, which I understand may be a patented feature, hence it’s exclusion on the gen 2. Overall, the addition of a really fast way to set wind is a nice upgrade from the gen 1 and makes is much faster and easier to get a full solution from AB, such that not only do you get a wind solution, but also enable the solver to be as accurate as possible for things like aerodynamic jump etc.
Display
Another excellent carryover from the 8k and the original 10k is the AMOLED display featured in all three devices, though there is one technical change that appears to have solved one problem but created another less critical one, which I’ll get to later. Otherwise, the display system remains unchanged from the gen 1, which is to say, excellent from an information and capability perspective. Again, have a look at my 8k review linked above for more information, but the summary is that the AMOLED display they are using allows them to do all sorts of things most other RF’s can’t do. The information that can be displayed far outstrips what has been possible in the past (like actually naming your profiles and being able to see it displayed when you are ranging so you are sure you have the correct profile selected). The digital compass reading has actually been really useful to me in trying to find points of interest etc. And the ability for the user to customize just what they want or don’t want to see is pretty great, considering pretty much all of it is right there when you range, no more waiting for the carousel to come around. Frankly, if you show everything, it’s pretty busy to my eye, but that’s why they leave it to each user to configure.
That display has a lot of really cool capabilities that are actually useful, but to me, the most useful is the ability to move the reticle on the screen to properly align with where the ranging sensor actually sits. Every RF I have tested has had some amount of misalignment, and they all have their own ‘within spec’ tolerance. So mapping sensor and reticle alignment is a must for any new RF you might buy, but then, you have to remember where the convergence is, and hopefully it’s in a place that is easy to reference. However, because Sig’s AMOLED screen is configurable, you can actually move the reticle on the screen to align with the positioning of the sensor. There is a limit as to how much the reticle can be moved, but if they cannot be aligned to lie completely within the reticle, I believe Sig considers that a warranty issue. So no matter what, you can ensure your reticle and sensor are well aligned. Mis-ranging is probably a lot more common than we realize, so In my opinion, this is probably the most useful and impactful benefit of the AMOLED display.
The only issue I noted with the display is that In changing the coatings on the gen 2, they appear to have made some changes to the brightness of the display as well. In most lighting, it’s not noticeable, but my gen 2 exhibits ‘ghosting’ of the embedded display screen as the light goes down. I start to notice it at about 15 or 20 minutes after sunset. At that point, it’s barely noticeable and isn’t an issue. But as it gets darker, it becomes more obtrusive. By the time it gets to the last minute or two of legal light, the screen is very visible, especially when looking at dark objects like trees. I could still see through it because the left eye has no screen, so your eyes blend the image and you can ‘see through’ the red box. But it is opaque enough at that light level to the point that if I was only using the right barrel, I would probably not be able to see to range accurately at long distances. Again, in all but the lowest light, you can’t see it, or it is hardly noticeable, but during those very last moments of the day, it became an issue for me. It is still useable, for sure, and it is a fair trade in order to solve the color caste problem, for sure, but it somewhat degrades ranging in very low-light conditions for me, though certainly does not preclude it.