Let me start with a question.
According to Swarovski‘s website, the diameter of the exit pupil in the 14x52 NL is 3.6 mm. Now, as this is a 14x52 binocular, the exit pupil should actually measure 3.7 mm (52 : 14 = 3.714286), right? So either of the two values 14 and 52 seems not exactly correct.
So, what‘s going on?
On my first encounter with the new NLs (
First image of NL x52's!, posts # 24 and 33), I had measured an exit pupil of 3.5 mm on the then available sample, and measuring objective diameter and magnification, I had found to have a 14.6x51 binocular in my hand.
Measuring the exit pupil on my present sample, I get 3.6 mm, in line with Swarovski’s specs, and the objective diameter and magnification are 51 mm and 14.2x, respectively (I reconfirmed photographically the magnification to be roughly 5% lower than 15x). So this is a 14.2 x 51 NL Pure.
Am I too pedantic?? Yes, most likely.
That‘s also why I am still not a fan of the FieldPro system and the tightness of the eyecaps - I replaced them with generic no-brand eyecaps.
Understand why my wife sometimes thinks I should loosen up a bit?
Holding the two binoculars in hand, what strikes me more than the weight difference (with full gear, SLC 1‘320 g vs. NL 1‘164 g, or just over five ounces) is the difference in size and ergonomics. See pic 1. There may be different opinions about which of the two fits better in one‘s hand. For me, it‘s very clearly the NL.
On the other hand, the difference in AFOV appears larger than what might be expected. I had always enjoyed the 62 degrees AFOV of the SLC; just don‘t place it next to an NL and you won‘t miss anything. But if you then grab the NL, the term „widefield“ gets an entirely new meaning. I find the 70 degrees of the NL truly impressive and immersive.
But I am rather not going to repeat now what I had said in my earlier posts quoted above (second paragraph). For me, the more detailed inspection and usage of the NL since my review of mid June
confirmed basically what I had said earlier.
But I re-examined things in light of the
Rokslide review (
Swarovski's NL Pure 14X52 vs SLC 15x56 Binocular Review), and below are my remarks regarding their findings.
Build quality
Matt Cashell of Rokslide finds the NL beats the SLC in “optical performance, build quality, and handheld performance”. I would agree with the first criterion (e.g. CA correction), but don’t know why the NL has a better build quality than the SLC, based on my samples.
Handheld useability?
Matt maintains that “high magnification binoculars are just not useable handheld for me. The magnified shake in the SLC 15x56 washes away the detail benefits of the increased magnification…but the NL is just different.”
Is it?
Matt mentions the trick with grasping the hat bill of the baseball cap to the top of the binocular and stabilizing the eyepieces with the thumbs. This, he says, got him a “fully useable handheld image
for a short time. It was almost shocking.”
Did he try that trick (which, by the way, I have been using myself for many years) also with the SLC? I guess not, because if he had, he would have found that this method of holding the bino works actually better with the SLC than the NL, due to the different positions of the focus wheel. With the NL, the bill of the cap gets in the way, and focusing is odd. It works better with the SLC. Still, even this does not give you a fully useable handheld image in my opinion in either of the two binos, unless you don’t really want to see any fine detail, but then why use a high mag bino? For me, a 14x or 15x bino belongs mounted on a tripod, unless it has IS (I even mount 12x and 10x binos and, occasionally 8x – to those of you who find that ridiculous I recommend trying it once and you will be amazed at the difference it makes in detail recognition).
What about the headrest (available for all NL models)? Yes, it helps, but for me personally not more than the baseball cap trick just described and therefore not enough to forego tripod mounting. I will be interested to hear how other users feel about using the headrest.
Whether the different ergonomics help improve shake is perhaps a personal decision to be made by each user for him or herself. I clearly prefer the NL.
Magnification
Matt found that “the 14x52 NL Pure appeared to have more magnification than the 15x56 SLC“, and he wonders why. I can only think that the much wider AFOV caused that effect in Matt’s eyes. My measurements revealed that the SLC magnifies roughly 5% more than the NL, and that is what I feel when using the two binos.
CA / Color fringing
According to Rokslide, in the center of the image there is no CA in the NL and only a “tiny hint … in certain high contrast situations” in the SLC. At the edge of the field, “some minor fringing”, but notably less in the NL.
I agree with both findings. Here, the NL wins.
Contrast
Matt found in “deeper shadow areas” that the NL showed “rich colors with great differentiation among shades”, while he appreciated “the 15x56 SLC’s punchy contrast and vivid colors”. I found both binoculars show a very nice image with excellent contrast; perhaps my eyes are not as good as Matt’s, but I could not detect a substantial difference between the two binos (both the NL and SLC confirmed here how good they really are!).
“Resolution” (I think what’s meant in Rokslide’s review is “sharpness”)
For close range and using the USAF chart, Matt found that the NL resolved one smaller element than the SLC; in long-range testing, the NL “resolved one line better on the eye chart”. It seems that Matt did not use a booster for these tests.
Neither did I, and I did not use the USAF or an “eye chart “either.
What I did instead was observing some advertising signs, signposts, license plates and billboards at various distances, between about 20 and 80 meters, which I chose in such a way that the text and numbers were not immediately readable in either binocular. I then used either binocular alternatively to try and decipher some parts of the text and numbers. It took me quite a bit of time to do that, over several days and with different lighting conditions, but with the two binoculars always side-by-side. An example of a billboard that I used is shown in pic 3.
There were moments of doubt when I was not sure which bino showed more, and that’s when I stopped for a moment to let my eyes rest.
But overall, for my eyes the SLC showed just
slightly more detail than the NL. It is well possible that this is due to the slightly (ca. 5%) higher magnification of the SLC, which would mean that the two binos are more or less of equal “sharpness”. This is not about declaring the SLC a winner and the NL a loser, but I think the SLC stands its ground very well in this discipline, and I cannot share Rokslide’s opinion that the NL is noticeably sharper.
Influence of atmospheric turbulence?
In Matt’s test, the NL seems to have “cut through the atmospheric disturbance (sic) better” than the SLC.
In my setup, I compared the two binoculars in a mixed alpine environment (see pic 4) and could again
not find the NL ahead of the SLC in detail recognition over a very long distance (5-15 miles) in a slightly hazy and quite turbulent atmosphere.
Low light performance
According to the Rokslide review, “the two binoculars had similar general illumination performance”, but “the increased resolution benefit of the 14x52 NL Pure was maintained, or even more apparent, as the light faded.”
For me, both binoculars exhibit a substantially equal performance in low light; given the very slightly larger exit pupil of the SLC, anything else would have surprised me. But of course, I used my eyes and Matt used his, so his MMV.
So where does this leave me?
For me, the NL 14x52 (like the 10x52) is nothing less than superb. If you can – and want to – afford it, I am pretty sure you will be as impressed as I am. But the direct comparison with the big SLC showed me again (I seem to forget over time!) how good the SLC still is, even compared to the newest and best competition. For me, with the latest generation SLC (all sizes) Swarovski had already reached an excellence that is hard to improve. The NL has lots of arguments for it against the SLC, but the latter has no reason to hide in terms of optical performance.
fwiw Canip
P.S. Oh, did I not mention glare (nor did Rokslide)?
Well, this was – and is - a non-issue in my tests and in the usage of both the x52 NLs. I have serious trouble triggering glare in the big NLs; I am sure some users will see glare, but I am equally sure the NL’s can be handled glare-free.