100mm Handheld Motion Blur Filter Optical Glass Prism Special Effect Camera Lens Filter Nano-Basic Series

This 100mm handheld diopter filter from K&F Concept is a great creative tool for adding dreamy, distorted, or abstract effects to your photos and videos. I’ve used it for portraits and product shots, and the results can be really unique when you play with angles and lighting.

The glass feels high quality and the edges are smooth, making it comfortable to hold and easy to position in front of the lens. Since it’s handheld, you can quickly adjust placement to change the look without needing to screw anything on or off.

It’s not something you’ll use every day, but for creative shoots, experimenting, or adding that extra layer of atmosphere, it’s a great accessory to have in your kit. If you like shooting with a bit of artistic flair, this is definitely worth trying out.

It's well made, and the effect is potentially very effective. It's like holding a pair of glasses in front of the lens with a clean transitioning border. Depending on the distance and use it can either magnify or blur what you are covering. It videos well also.

The filter does deliver the effect it advertises. I wrote in another review for a visual filter like this that the effect is subjective, and overuse is the fault of the artist and not the tool, and I feel this filter could be quite effective in the right persons hand. Build wise, the filter is very well made and the glass is nice and clear and does what it advertises.

I think it's good for photographers to try new things and experiment - it keeps our creativity fresh. That's why I got this filter from K&F and it definitely is different from other filters I use. It's handheld instead of screwing on the front of the lens and it's a half circle which allows for some interesting effects on the image. I did some test shots with my little friend that you can see in the attached images. The quality of the filter is pretty good considering the price. Honestly I'm not sure how I would use this filter yet, but I'm glad I have another tool in the kit when I'm looking to try something new. I do wish they had included instructions on how to use this filter to achieve a desired effect. It's just trial and error without having used something like this before.

The handheld filter is shaped like a half moon, with two finger holes for easy grip. I found it very easy to hold while also holding onto my camera. Granted, if you camera is kitted out, you may struggle holding it with one hand, but for its purposes, it does it well. Some samples below. It can add a diffused light reflection if you angle it the right way, or introduce some artistic blur to a side of your picture. After using this, I kind of wish I had one that is curved, so that I can create a nice blurry half bokeh, but this is plenty cool. Love it, and will absolutely be taking it out on my next portrait photo walk.

This is fun to experiment with for adding fun and cool "practical" effects into your shots rather than use an artificial or digital effect after the fact. It feels substantial and well-made, but still relatively light and portable, so it's an easy addition to your camera carry. Great for distorting light or blurring part of your shot to add extra focus to your main subject or another area of the frame. It comes with a padded carrying case that's much larger than the filter itself, so it might be nice if there were a custom-shaped case to help cut down on size. And the glass can be prone to fingerprints so you have to be a little delicate when using it if you are using it handheld (and not on a mount).

So I'm not going to knock anything about if the effect is cheesy, dumb, or anything because the filter does exactly what it says it will looks wise.

What I can say is the filter is built really well, is sturdy, and make your life easier and invest in a magic arm and a mount while using this if you want consistent results, but hand hold it if you want easy fine tuning.

I found the effect akin to the Black Hole in the movie Interstellar with how it warps space and light. The effect can go from subtle to pronounced depending on how much of your lens you cover with the filter. Video is quite interesting with it since it can create a dream effect that can be interesting.

As mentioned above, I REALLY suggest using an articulating arm to hold it if you want consistency as small micro movements create a dramatic shift in how it works. Even the angle of filter can create warping and distortion vastly different even if you change it by 2~3 degrees.

Constructed well. While the effects of the filter are subjective to the artist, objectively it does the job it's supposed too, and it's made well to help achieve the results either with mounting it to a magic arm for consistency, or hand held.

Good for video, good for photos. I won't use it all the time, but it's neat to mess with. Comes with a heavy duty carry case also.

As someone who collects creative lens filters and regularly uses them in both personal and professional work, I’m always on the lookout for new tools that offer something different. This Spiral Halo filter from K&F Concept is a fantastic addition to my growing collection. It’s not just another gimmick — it’s a well-built, thoughtfully designed piece of gear that holds up against filters from brands costing two or three times as much.

Right out of the box, the quality is obvious. The K9 optical glass is crystal clear with no distortion, and the metal housing feels sturdy and well-machined. Unlike a lot of cheaper special effect filters that feel more like toys or novelty items, this one feels like it’s made for working photographers. One of the things I really appreciate is that it comes with a screw-mount holder, which allows me to mount it directly to my lens instead of handholding it. That might seem minor, but for long sessions — especially when shooting beauty or stylized portrait work — it makes a huge difference in consistency and comfort.

I specialize in beauty and avant-garde portraiture, so I’m constantly experimenting with ways to create atmosphere and texture in-camera, rather than relying entirely on post-processing. In an age where Photoshop and AI-generated edits dominate so much of what we see, it’s refreshing to work with something physical that bends light in a very real and organic way. This filter produces a subtle but compelling swirling glow around light sources — especially striking with backlit subjects, rim lighting, or anything involving practical lighting setups. The result is dreamy, otherworldly, and a little surreal without going overboard.

I also really trust K&F Concept as a brand. I’ve used several of their other filters and accessories, and they’ve all delivered consistent quality. They’ve carved out a space where professional-grade tools are still accessible — which is something I respect and appreciate as someone who shoots often and likes to work fast without compromising on results.

Bottom line: if you’re someone who values in-camera creativity, enjoys playing with light and atmosphere, and wants gear that feels as good as it looks, this Spiral Halo filter is an excellent investment. I’m excited to work this into my regular rotation and see how it plays with some of my other specialty filters. It’s the kind of tool that keeps creative photography fun, unpredictable, and tactile — which, for me, is the whole point.

K&F has really stepped it up with this new line of handheld lens filters, and I’m genuinely impressed. The design includes a 1/4" thread so you can mount it to an arm and hold it in front of your lens, very clever. I don’t have the full rig yet, so I’ve been experimenting with it handheld, and the results are still fantastic. It creates a soft focus or motion blur effect that adds a unique, dreamy character to the image, perfect for creative portrait work.

This filter has opened up a whole new creative avenue for me. It essentially brings some of the visual magic you’d normally add in post-production right into the shoot itself. That alone makes it a powerful tool for photographers looking to explore new styles and techniques.

Highly recommend this filter and honestly, the entire line from K&F. They’re pushing boundaries and making creative tools more accessible.

Bit of a faff to hand-hold, but creates an interesting effect that viewers of some 1970s movies might be familiar with, where both near and far subjects are in focus. Perhaps a tripod bush to fasten it to a lighting stand or tripod might be a good idea for an updated version of the product, because using it really needs three hands - one holding the filter, a second holding the camera and a third focusing the lens.
The glass in the filter is free of imperfections and is large enough that you can move it back and forth without fear of your hand or the mount appearing in shot. A padded case is provided.