Sounds a little too good to be true? Well it might be, I didn't count the 950nm longpass that I used in the price. But if you don't already own one, a piece that corresponds in size to the other filter can probably be had for next to nothing on eBay.   What's the other filter? This. https://www.ebay.com/itm/133238203848 It was extremely cheap so I didn't expect much, I was afraid of striations and such, turns out the biggest downfall of this item is the low OD, which isn't even specified. I aske