[0.23 lb] Works great on full spectrum cameras. Lets you get into the deep infrared on 720nm or higher converted cameras.

[5.2 x 5 x 0.9"] I’m new to IR photography. I’m using a Sony F828 with the magnet hack (Google it) & various external filters. I started with standard filters such as 720nm & 850nm but wanted something to pass more color for a more interesting twist. This 550nm delivers; it was worth the wait. It’s a lot of fun and making me enjoy photography again. There’s a lot of information out there about post-processing. Play with channel swapping (Photoshop channel mixer) to flex your creative muscles.

[Aluminum] I use a wide range of lenses, from cheap primes to large zooms, and my filter sizes vary across the range. With these clip-in filters, I can attach ND filters and shoot video with both RF and adapted EF lenses with no issues.

This 6 stop ND was perfect for shooting a music video outside in sunny Los Angeles, and the 1/8 Mist had just a hint of glow to highlights without killing the contrast. 

I own all three 1/8 mist (0-stop, 3-stop, and 6-stop), and I have one in my camera at all times. Looking to try the 1/4 mist at some point to compare.

[Aluminum] After long ago exploring IR images with Kodak chemical films, I purchased the Kolari K665Pro and K720Pro to use on a stock Canon EOS 5D Mark IV and Canon lenses. I chose the Kolari Pro series for their sharp cutoff spectra as well as their filter coatings compared to Kolari's base series or Hoya. The Kolari Pro quality / performance / price point trade-offs were great IMHO. Starting with the 665, I set the camera for manual exposure (typically bracketing around +2) and manual focus (typically longer focus settings), and the stock sensors pick up enough red for good composition and control. It has been a short learning curve and I am most pleased with the images that the Kolari filters are generating: awesome black and white landscapes, cloudscapes, and waterscapes, and excellent starting points for post-processed color shots (native red hue or channel swapped)! No discernible color aberration until I push the image magnification to its pixel limits. The coatings have been great with tough lighting angles - no flares - and stay remarkably clean in windy, dusty environments! Continuing experiments with the 720, which pushes the limits of the stock sensors but still works well. Highly recommend the Kolari 665Pro for anyone getting into IR!!!

[Dedicated] I decided on the 3-stop version because I was looking for a little help during sunny days and this has worked perfectly. The magnet slaps right on place and is easy to remove with anything that has a thin corner like a guitar pick or a credit card. No more ND filters dependent on diameter size!

[Aluminum] I'm not sure how long rear filters have been around, but this is absolutly groundbreaking for astrophotography, as well as other purpose filters ie: Polarizer, Neutral Density, B&W, etc. So much easier, and cheaper, than purchasing numerous front filters and the smudges and dust they attract, not to mention the space those velcro filter holders take up in your gear bag. I'd rather have room for another lens (or two). Simply cover your lens with a UV/protection filter. Lastly, these rear filters are simple and easy to change out. I'll personally just use one camera for astrophotography and will buy a rear Polarizer filter for one of my other cameras for daylight shooting.

[Glass] I really like everything except I needed to order a larger size to fit a circular polaizer.

[Aluminum] Infrared takes a hole lot of experimenting. If you convert a camera I would say make a Full Spectrum Conversion. After that a full set of filters to se your options. This filter is one of the most user friendly filters you can get for it. Have fun with it if you get it.

[0.23 lb] I use a wide range of lenses, from cheap primes to large zooms, and my filter sizes vary across the range. With these clip-in filters, I can attach ND filters and shoot video with both RF and adapted EF lenses with no issues.

This 3 stop ND was perfect for shooting a music video outside in sunny Los Angeles, and the 1/8 Mist had just a hint of glow to highlights without killing the contrast. 

I own all three 1/8 mist (0-stop, 3-stop, and 6-stop), and I have one in my camera at all times. Looking to try the 1/4 mist at some point to compare.

[Dedicated] Best high quality filter for my infrared photography. Very happy with it.