Normal colors test: Tangsinuo QB21 & ICF ("hot mirror") filters on Sony a7 full spectrum camera
I have bought QB21 and ICF filters from Tangsinuo on eBay for normal color imaging with my Sony a7 full spectrum converted camera with EL-Nikkor 80mm f/5.6 (old metal version) and found them, particularly some of the QB21 filters, to be too thin, which results in reds that are too light and signs of IR leak. After receiving yet another set of 52mm and 58mm filter that were listed as 2mm QB21, I thought they looked just as thin as before, but this time I did more than just test images of ordinary
I just did a quick and simple test with a plant in my living room in order to see how much color difference there is from near IR leakage in the green leaves. To me, it is obvious that they have a red tint in the image with only 1.5mm filter. Of course, this is without creating a custom camera color profile, which will remove at least some of the red discoloring in the darker tones. And with a 2mm QB21, it will be even less. Still, my stance is that 3mm QB21 is the best filter for a Sony camera,