6.5mm×1mm optical filter

Excellent filter to block infrared from sensors and cameras. Note that two filters are provided (not 20). I have attached a photo showing the percentage of incident light transmitted through the filter versus wavelength - it blocks wavelengths larger than about 635nm. The slight mismatch in the spectrum near 460nm is likely due to my spectrometer needing some calibration. These filters should work well with some smaller silicon photodiodes (etc).

Cut offs as advertised, nice and sharp. They need to update the specs on % Trans for <400 cut off or I couldn't find it. They have it for >700nm. To help reduce even more I stacked 2 of them. They are useful for the planned camera applications but also for amateurs using spectrometers looking for ways to evaluate scatter.If they could I would like to suggest another product -- 360-830nm corresponding to the range used in chromaticity calculations. It may be a niche market, but I am sure that some may appreciate being able to simply use a filter for both reducing scatter by reducing the wavelength window and expanding the range over this product for better evaluations for the x,y and other color parameters.Great filters. Well worth it.

Works good thanks

Worked like a charm. They were just the right size. Fixed the image color up nicely.

The picture is misleading. Instead of 1 page of these things, I got 2 lenses in a small box.

Great item and seller!

Great

This is as advertised, a good quality IR filter class. It has 10 mm diameter with thickness of 1 mm. This fits well for using in microscopy or spectroscopy devices. My only complaint is why it is shown to be compatible with DSLR cameras, maybe something I'm missing!