Reviews
This is a specialised filter to remove the orange glow from sodium street lighting during night-sky photography.
It looks to be a quality product although, when I first saw it, I was surprised to see how lightly coloured the filter material seemed to be.
I have a small spectroscope and this showed that it is, in fact, a vary narrow band filter, which cuts out wavelengths around the orange sodium 'D-lines' but leaves the rest of the spectrum largely intact.
It works very well for me but is unlikely to be effective against newer types of broad-spectrum LED street lighting, so don't expect it to be a total 'cure-all'. I've taken off one star because of this limitation but it is very effective at what it does.
It looks to be a quality product although, when I first saw it, I was surprised to see how lightly coloured the filter material seemed to be.
I have a small spectroscope and this showed that it is, in fact, a vary narrow band filter, which cuts out wavelengths around the orange sodium 'D-lines' but leaves the rest of the spectrum largely intact.
It works very well for me but is unlikely to be effective against newer types of broad-spectrum LED street lighting, so don't expect it to be a total 'cure-all'. I've taken off one star because of this limitation but it is very effective at what it does.
17.08.2021