More on pocket binoculars that are, well, pocketable.
Since everyone's pockets are different, here's what makes a pocket binocular in my case.
I've finally got hold of what appears to be a quality 8x20, a 2007 Swarovski Habicht.
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Vortex Diamondback HD, Zeiss Terra ED, Swarovski Habicht. Comparing these three different 8x in 32, 25 and 20 mm I find it interesting that, although the 32 and 25 are separated by 7 mm in apreture, they seem to be akin than the 25 and 20, even though the difference in this case is only 5 mm.
The weights are 445 g for the Vortex, 315 g for the Zeiss and 220 g for the Swarovski. Unfortunately, the Swaro I've been able to purchase is the bling-blingy version with dark crystals (ouch... so much for my preference for understated binoculars, clothes and things in general), wonder if the "normal" 8x20 Habicht can snatch a few grams from those 220 g compared to this one.
Dual hinges open (all set to my IPD):
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Comparing the Terra to the Diamondback I'm beginning to think that what the Zeiss designers had in mind is a 8x25 that handled as closely to a 8x32 as possible. So much so, that when "on service" mode, there's hardly any difference in overall dimensions between Vortex and Zeiss. I guess for some this could be seen as a great achievement, but then when I'm looking for small, I tend to think it isn't. Yes, so I can carry something that tries to behave like an 8x32 in a smaller package... but on the other side, the difference in comfort and ease of use (as well as FOV) is massive and favours the Vortex.
In use, again, the Zeiss is closer to the Vortex than to the Habicht. Comparing only the Vortex and the Zeiss, I noticed a huge difference in comfort, but when adding the Habicht to the mix, surprisingly the Vortex and the Zeiss are part of a more "uniform" group, while the Habicht sits on its own. It is way smaller and lighter, also the eye placement is more delicate, and the fact that the focus wheel is no the far end does not make things easier to begin with.
Eyecup diameter is roughly 40, 32 and 29 mm, really borderline in the Habicht. So, with a truly pocketable device you get truly obvious compromises, but then it is what it is. In fact, what frustrates me about the Terra 8x25 is that is so long and bulky I don't find it pocketable at all (say, it's basically nearly as uncomfortable as carrying a 8x32 Traveller or Diamondback). The Habicht folds to a really compact package that fits the micro fibre bag of a pair of sunglasses, the Terra doesn't.
Daily cyclist's note. While on my commuter bike, I would simply carry the binoculars on my handlebar bag (there, 8x32, 8x25 or 8x20 make no difference), but when going light or on my road bike, I can squeeze the Habicht (in the picture without the pouch) on one of those "tool bottles" that you carry on a holder on the frame, basically a water bottle without the spout.
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I live in the countryside, and cycling usually involves open spaces with plenty to see, so it's always great to have a little companion just in case.
As for pure optical performance, it's hard to forget all the quirks and drawbacks of the Terra, but I'd say it's probably the sharpest of the three, surely sharper, brighter and more contrasty than the Swarovski. This was a bit of a disappointment, I hoped the Swarovski to perform at least as well as the Terra, but I must admit that the MIC cheaper device simply has a better view. Switching from the Terra to the Diamondback what really surprises is the huge FOV of the latter, I'm not sure if this creates a magnification effect, or maybe the Terra is not fully "8x" (or maybe the Diamondback HD is +8x), but I get the same feeling you get when switching from a 8x porro to a 8x roof, there seems to be a higher magnification, although it is a purely subjective perception. So, between the Diamondback and the Terra, although the Zeiss is probably better, the Diamondback surprises with a really "inviting" view, the kind that puts you in the scene, for some reason it has a hugely larger "3D/immersive" effect, it's hard to describe. But then, comparing the 8x25 Terra to the 8x20 Habicht, optically there's little the Austrian can do, the Zeiss is more comfortable, brighter, sharper and has a better contrast, and probably a "purer" colour representation. So, from 8x32 downwards is all an incremental set of drawbacks of compromises, as is to be expected. So, the 8x20 Swaro fits in what I'd call pocketable, while the 8x25 Terra's size/weight do not justify its many drawbacks. By all accounts, the 8x20 Ultravid and the 7x21 Curio have great optics and improved handling/ease of use, but then their prices are really out of what I'm ready to spend in a device which sees limited use (although a really pleasing one).