Good ND Filter for the 18-135mm Sony E-Mount Lens

I did this with an 18-400mm lens, just one filter I need

I have other K+F filters for other lenses and they have been exceptional. I ordered this duo for the Sigma APS-C 18-50mm F2.8 zoom I use on my Sony A6000. When I stack both filters together, there are severe black corners. When I zoom from 18 mm to 19.5 mm, they are gone. If I use one filter at a time, no problem. So I decided to leave the polarizer on for the summer and reinstall the UV in the fall. Unless I plan to shoot 20-50mm on a given day. These filter rims are so thin that I don't think there is anything on the market that could improve this situation. I have put K&F on other lenses with no problems. Must be just this Sigma lens design.

When used on a Nikon D3400 18-55mm it gives great results! Since I was curious to see the result before buying it, I thought some people would like to see a comparison between a picture with the filter and another without the filter...

We just love this binoculars!

They are brilliant, I can see so much from this, the conclusion is excellent, really well done, would recommend to anyone.

Compact but super powerful crystal clear monocular for a serious hiker or an outdoor adventure seeker. It's always important for me to have handy binoculars or monoculars nearby to take an exceptional look at nature and our oceans and mountains. Also great for bird watching and sporting events.
K&F Concept has done it with this very affordable monocular right here. This is 10-30x40 means not only can you see the object brightly and clearly, but you can also use the zoom function. With my years of experience with binoculars and monoculars, I'd like to suggest that if you're going over anything over seven power, it's better to use a tripod. Most people blame monocular, but it's actually their hands/body movement (nothing wrong with the product) This monocular comes with excellent built-in tripod screw function. Please see all my pictures and decide for yourself.
Also, I would like to point out that the lens is 40mm with a perfect 20mm eye lens. Even when the sun goes down, you can have a wonderful view because of the larger size of the objective lens. It will take a few times to perfectly open the monocular but it is to be expected from such a wonderful product. Enjoy the sightseeing!!!
PLEASE NOTE: Tripod is not included, but it will fit any tripod. The zoom image I took is only at 10 power. It's my cell phone picture nothing fancy. Amazing right!

Nice filter. Certainly useful in certain situations. Ideal for sharp lenses, especially without character. That brings some mood into the game. It's nice to have, looks well made and I love that I can put it on a lens and still use the lens cover over the filter when not in use. I use it on my Sony 18-105 f/4 and Sigma 18-35 f/1.8 and am quite happy with the result. In my images, the last image is the one without the filter, hopefully you can get an idea of ​​what it does.