[Front] I'm actually using this as a cap for my Nikon microscope eyepiece tube. Some older Nikon microscopes use this size, and this fits perfectly. I use these for many of my camera lenses as well, and it fits very well. They fit snugly, but not so snugly you can't get it off when you need to. These have to be one of my favorite caps.

[31 mm] Wish it was a little cheaper, but it's what I need

[0.01 lb] Finding a 92mm push-on lens cap is hard, with very few suppliers world-wide.
This one was brand new with a great price from B&H and very speedy dispatch and delivery to me in England.
Thank you!

[0.01 lb] These are nice and snug, and they fit perfectly!! Why couldn't Bushnell come up with these in the first place?! They're great... I recommend them wholeheartedly. They fit much better than the caps that originally came with the scope.

[31 mm] I started using these over 20 years ago and still do for all new lenses. They last and are well made and stay on very secure

[31 mm] This cap fits very smoothly and snugly on the B+W 46 mm filters. I love these caps, especially for lens storage. They fit very well and protect lenses well and don't easily fall off and get lost. They are a lot less rattly than the pinch style caps. The only thing with these caps is you have to measure the outer diameter of whatever you need the cap for so you can get the correct cap since these go over the outside of the lens or filter. I also love how these caps fit even if your filter or lens does not have easily accessible or has recessed filter threads. The cap I got now has an updated and more modern looking design embossed on the front of the cap with the modern Schneider Kreuznach logo. Some of the older ones I have have the older logo. You can't go wrong with either. It's subtle and looks at home on the front of any lens from large format lenses to some nicer small or medium format lenses and cameras. The cap is domed, and will protect your lens even if the front element is flush with the top of the filter ring. It's also pretty deep, so it isn't too easy to dislodge it accidentally. It definitely will not come off in your bag. It is easy to take off and put back on if you are using it in the field, but in the field I tend not to use lens caps and just keep my front filter on to protect my lens from sticky fingers and mud. Of course these aren't as perfect as the SK Grimes custom caps, but for the something that comes in standard sizes, and for the price, these are well worth it.

[0.01 lb] These covers are super versatile. I use them on scopes that don't have caps designed for them. They fit excellently and stay on until removed.

[0.01 lb] Fits LEE 82mm WA lens adapter ring. I can now keep the adapter ring on my lens and use this cap to protect the front element.

[Slip-On] Perfect fit on a range of E46 lenses. Best lens cap IMHO. Light. Does the job. Looks classic. Typography is different than the picture, but still nice.

[Front] I have a vintage Nikon 500mm mirror lens that was missing the original cap; it's a weird size, 88mm; gave this a try. With a layer of fabric tape on the inside rim or the cap it fits fine.