I do not like the caps that you pinch or screw on these are my prefered type of caps
Always by Scheider caps for my lenses well made great product

The CMOS air filter provides clean air for the Nitecore BlowerBaby, which gives additional assurance while cleaning camera sensors and lenses.

One of the best items I've purchased for my 140mm telescope.
The reduction in sky glow and the contrast improvement add to those Oh, Wow! moments of star gazing.

I got this for my TLR camera with Heliopan Bay I filters, and it fits and works perfectly, just like any of my other Schneider push on lens caps. These are my favorite lens caps, and I love how they come in many sizes for anything you might need. Since they fit on the outside of the lens, you have to make sure you measure the outer diameter of you lens barrel or filter so you know which one to get.

Very nice. Could use one more thread though. Seems a little short on threading when trying to attach and remove while making lens changes in the dark. Makes me a little nervous sometimes that I will drop it during removal from the lens. Good quality though and I like having it around.

The 36mm Kaiser lens cap makes a great dual purpose cap for the Panasonic LX5. Here's how you use it - there's a type of artificial felt used in woodwind repair (you have to find the right thickness)and you glue a strip of this to the inside circumference of the lens cap and another to the outside smaller circumference. When the camera is turned off (lens retracted) the outside felt press-fits inside the camera's screw-on ring. And when the camera is on, it press-fits over the extended lens - be sure that the latter felt isn't too tight - and also be sure to tell the camera to not automatically retract the lens. This lens cap is great and I give it a 5* rating.

I bought this to see if it would help bring out some color and detail for my astrophotography. I have little light pollution in my area but it this thing really does what it's supposed to. I did some test shots with a colorchecker passport in regular daylight and the difference is definitely noticeable. There's a very clear boost in color and slight boost in contrast, what I mean is that they appear more clearly and saturated. It's magic! I might even start using this for some regular photography too! I have to use step-down adapters to fit these onto my lenses as I am not using it with a telescope (67mm, 58mm, 52mm). I just wish they made these in sizes native to DSLR/Mirrorless lenses! Highly recommend! Also if you are someone purchasing for a DSLR/Mirrorless camera, Get the 2 version of course, and you will need step-down/step-up adapters to 48mm. Even though 2 is not 48mm, that is the threads for this baader filter. I recommend the sensei filter adapters, cheap and very well made. In order to adapt some lens sizes down to 48mm, you might have to buy a couple adapters and stack them. I had to do this for my larger 67mm lenses. There will of course be vignetting when doing this, but its no big deal to me.

What can I say about an air filter. It appears to be quality made,

I got this for my TLR camera with Heliopan Bay I filters, and it fits and works perfectly, just like any of my other Schneider push on lens caps. These are my favorite lens caps, and I love how they come in so many sizes for anything you might need. Since they fit on the outside of the lens, you have to make sure you measure the outer diameter of you lens barrel or filter so you know which one to get.

These are great caps, they provide more protection than hard plastic and Schneider seems to make a size for every lens that ever existed or ever will exist.