[5.1 x 4.8 x 1"] Works great on full spectrum cameras. Lets you get into the deep infrared on 720nm or higher converted cameras.

[77 mm] 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.

[Glass] 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!!!

[0.315 lb] This is not a filter to have just for fun. First of all it requires you to have a Full spectrum conversion on your camera. Second of all it is for a very specific use and its price is no joke, so if you don't need it I would spend my money on something else I would use more. But in my case it's been a blast. I will use a lot more my converted camera now that I have it, and just getting started with experimenting out of the users manual I have a lot of ideas to work on with this filter.
The filter only lets through UV light so exposure compensation is required and even under bright sun you will more than likely shoot on a tripod, with high ISO using slow shutter speeds. This filter is a tool, not a toy.

[0.315 lb] Best high quality filter for my infrared photography!

[Glass] This filter is easy to put in and easy to remove. The mounting mechanism works really well and the all metal construction is very durable. The filter itself is high quality and works very well. Kolari customer service is also fantastic.

[5.1 x 4.8 x 1"] I have only tested this filter on my Lifepixel-modified Canon R6 (v1), but I like it already. It produces some really interesting color combinations that my other Lifepixel IR filters do not. Samples below are with custom white balance in-camera.

[0.315 lb] Filter really makes a bold difference in astro imaging. Noting that the lens sun hood doesn't fit over the knurled edge of the filter. I can live with it since a sun hood is rarely needed at night... if I were to use this filter for artistic reasons during the day I might have another thought

[Brass] This filter case is made well and the magnetic latch is secure. I have not tried a drop test but I see no need to.

[5.1 x 4.8 x 1"] I really like everything except I needed to order a larger size to fit a circular polaizer.