42mm Binocular/Monocular Objective Lens Caps Internal Diameter 51.8-53.3mm Rubber Cover Set Black, (51.8-53.3LC)

Works great. I’ve lost two lens protectors so far so let’s see how long this hangs on. Look just like my Vortex ones without the logo

If you're like me, you might be wondering... Do I get the 50.5-51.8mm or the 51.8-53.3mm. Well after trying both I can say definitely get the 51.8-53.3mm. Because the Prostaff P3/P7 has a thick rubber armor the smaller of the two was too tight, you almost have to force it a little around the lens. With the 51.8-53.3 you just push it in and it fits perfectly snug, not loose or too tight. The quality of these is fairly good. I was worried they'll be too much flex on the cap but it has a nice balance between flex and stiffness. I would prefer it to be a slightly stiffer/harder but it's still good the way it is. The edges are cut perfectly smooth. One noticeable thing I like is when the cap is off, it goes straight down and out of the way of the viewing lens as shown in the photo. Definitely recommend.

Perfect fit for the Vortex Crossfire HD 8x42.

I bought my Nikon Aculon 10x42 Binoculars on Amazon almost 4 years ago. The binoculars work great and are ideal for birdwatching. However the lens covers were a problem from the beginning. They were not attached to the binoculars and could not be attached in any secure or functional manner. Very recently I dropped one without knowing and it was lost for good. I contacted Nikon USA and oh what a difficult item to replace. I gave up and searched online for a better solution. VOILA ! I found these attachable lens covers on Amazon with different sizes to fit different size lenses. I followed their directions and measured the outside width of my binocular lenses. These arrived within a day or so and they fit perfectly. The rubber loops fit securely over the lenses and they do not fall off. I LOVE IT !

i measured exact and the caps are tight. I have to manually stretch them out to fit over the glass. I'd recommend adding a mm to your size estimation. They are also not as beefy as the covers that came with my Nikons and Swarovski, which you would expect from an aftermarket item. If you're looking for high quality, this item will get the job done, but, minimally.

Fits well.

My binoculars (bought at an estate sale) had no lens caps. I think caps are a necessary accessory. After researching the options, I chose this product and it is a perfect fit: snug (so they stay in place and can’t fall off) but not so tight that they are a struggle to get off. The key to getting the right size is to measure the outside dimension, not inside. The way the heading is written, the term “inside dimension“ is most prominent so could lead to errors in choice. Elsewhere, there’s an instruction to measure the outside, but punctuation would go a long way to fixing the clarity of the main heading.

Perfect fit for my Swarovski binocular objectives. These fit snugly on both objectives compared to the oems, which had stretched and constantly flopped off. I can recommend these. They seem to be good quality and stay on until you pull them off.