Opticron Rubber Objective Lens Covers 42mm OG M Pair fits models with Outer Diameter 51~52mm

Yes, they seem somewhat overpriced for what they are: two little rubber rings with attached caps. But I must say: they are an absolutely perfect fit to the objective lenses of the Leica Ultravid 8x20 Binos - and are FAR better than the Leica originals (which required attachment to the neck strap if you wanted to keep from losing them, plus were "loose-fitting" to boot). These Opticron 30-31 mm caps not only fit just right, they won't get lost - and do not interfere in any way with the ability to keep them mounted when inserting the binoculars back into the case. (And yes, they do also perfectly fit the eyepieces - I may have to get yet another pair... ( sigh - :) ).

48-50mm Fits my Nikon P7 Prostaff 8X42 perfectly. Easy to install. Will know durability with time.

I bought these as objective lens covers for my Leica Ultravid 8x20 compact binoculars. They are a good fit and work on the eyepiece side as well. The Leica's come with eyepiece covers, but they must be used either loose or attached to the strap. I prefer to keep these as pocketable as possible, so I don't use the strap. So I'm getting an extra set to use on the eyepiece side as well. Note, however, that using them on the eyepiece side means that either they sit a bit awkwardly on the pull-out eyecups OR they have to sit on the barrels where they will ever so slightly hit the Ultravid's wonderful and delightfully oversized focus knob and prevent the binoculars from fully folding up (it's about a 2mm difference in total). No impact on folding up if used only on objective end. Since the Leica Monovid 8x20 is basically a single tube Ultravid, I tried the lens cover on the Monovid object as well and it's a great fit. Moreover, it's slim enough that the Monovid will still fit in it's leather carrying case with the objective cover left on! My previous solution, a hard plastic flip cover suggested on some sport optics forums, is more durable but precludes the use of the Leica carrying case when mounted. It's also much stiffer and harder to open (it's really designed as a cover for a rifle scope). This Opticron cover is a much better solution for a birder like me. The material grips well to both the rubber armored Ultravid (I have the BR model) as well as the metal barrel of the Monovid. Pricewise, these are a bit expensive, but there's almost nothing else out there at such a compact size. So I'm buying two more pairs: one to use on the Ultravid eyepieces and another to put on the Monovid.

Leupold Yosemite 8x30 binoculars: measured objective OD was 43mm (old binoculars but I still use them a lot). These 42-44mm covers are a perfect fit. Snug but easy to slip on. Good quality material. These binoculars came with caps that have no attachment, so this was a "must" (wish I had done this long ago). I was taken back by the price, but once I received these covers, it appears they might be worth it. Attached pic shows one side with cap on and the other side with cap removed so you can see the natural fall point. Nikon Laserforce 10x42 range-finding binoculars: measured objective was about 54.6. The 53-55mm covers were a perfect fit. I was a little worried that they'd be too snug, but not the case. They fit just as nice as the aforementioned covers described above. The covers that come with these Nikon binocs are 'plug-inside the objective tube' rather than a cover. After several uses, I found that much as I like the plug design for sealing out the elements, they just never went in easy. It always took a little fiddling and some moderate pressure to get them in (one slip and you could easily end up with your greasy fingerprint smushed onto the lens). These new covers go on very easy without any fiddling or unnecessary force, and they are plenty snug that they won't come off. If I had not purchased these covers for my Leupold binocs, I would never have purchased for covers my nice, new, and expensive Nikon binocs. But I'm glad that I did. Much as I like these Nikon range-finding binoculars (they are awesome), I was getting tired of spending 30 seconds and, arguably more importantly, having to divert all of my attention to the binoculars just to secure the objective lenses.

Using these on Zeiss Terra ED 8x42 (choose outer Diameter 53~55mm). The loops that go around the objective tubes are a little loose but shouldn't slip off. The lens covers have a good heft. The fit is snug enough so that the caps don't fall off, but also push on easily.

Ordered for 8x30 Swarovski Binoculars. They fit like factory originals. A little on the cheap side. I hope to get a few years out of them. Originals that came with the Swarovski's were good for 20 years. I could not find original replacements so I tried these. Great fit but the strap that tethers them is very thin rubber.

I checked with Opticron before purchasing, Pete was right on! They fit my Swarovski CL Curio 7x21 binoculars perfectly and the quality seems good.

The covers fit my lenses perfectly. I had trouble locating the right Suze. O have another set coming but I don't know if they'll fit. I might have to return them. I'll let uou know when I receive them.