The product was put through a field evaluation by H&Y Global Ambassador, Giovanni Corona. His article is being reproduced here with permission (Note: Minor editorial changes).
And we came, last but not least, to the “darkness” section: night shots. Today we are more and more fascinated by this kind of shots: nightscape, cityscape and even astrophotography.
In this case we find ourselves fighting another kind of light, rather parasitic: the light pollution coming from the artificial lights that are reflected between humidity and different types of particles of which the atmosphere is composed. Notwithstanding that: there is no night filter that switches off the artificial lights (ehehe we still hope!), the filters for the control of light pollution (anti LP) are usually composed of a film or totally made of neodymium: chemical element that, in in this case, it allows the absorption of particular frequencies of the color spectrum (warm) CHANGING the shade, sometimes also in a visible way to the sight (from the rosy aspect passing through the cyan up to the quite intense violet).
The “PureNight” H&Y filter is totally made of neodymium glass and is able to filter the color spectrum of frequencies between 570 and 590nm while it is able to limit the frequencies from 590 and 620nm: this will allow you to manage the night glow hot both inside and outside the city, but if the phenomenon is very present and if the weather conditions are too unfavorable, the phenomenon will continue to be quite visible.
Here alongside some of my shots made without and with PureNight Filter. Obviously even the Pure Night filter can be “framed” and used with the magnetic system.
To simplify, I numbered the photos so as to make the comparison more immediate because it is quite complex. First I took the Photo N°1 with filter inserted, extending the time of 6 “and keeping unchanged aperture (ƒ/2.8) and ISO value (3200) The white balance was set at 4650K and +2 of Tint;
Photo N°2 I used the same shooting settings (ƒ/2.8 and ISO 3200) but decreasing the shutter speed (20″) to compensate for the final result and the WB was set at 4450K and +5 shades (so just colder and more turned to magenta than the previous one).
Finally, Photo N°3 resumes the settings of No. 1 but with the shooting times of N°2 (20″) and the ISO at 6400. We will then examine the various comparisons step by step.
1-Effects on the intensity of artificial light
In this first comparison we will see how, by applying +0.50 of exposure to shooting N°1 compared to N°2, we will get a scene almost identical but with a very different situation regarding the intensity of artificial light reflected by glares, making it certainly a more homogeneous shot and also about the “darker” parts of this starry.
2- Effects on color temperature
In this second comparison we will see how, setting with the same value the color temperature and increasing +0.50 the exposure value on photo 1, the photo will not be “the same” and, therefore, the use of the filter positively affects those areas in which light pollution compromises the visibility of the sky. Also interesting is the part of the Via Lactea (i.e. Milky Way), assuming a more homogeneous and more “verisimilar” color with regard to astronomical photography, with a small emphasis on contrast without affecting its brightest parts.
3- Effects on the overall result doubling the ISO
In this last comparison it is still possible to notice a reasonable margin of difference between the two shots by applying to the shot N°3 (which is twice the ISO value of N°2) a reduction of -0.50 of the exposure value: even though , almost identical, the same exposure and the same balance of white we can still notice the differences of glow especially under the rock, also there is a very good general contrast that does not affect the nuances of the milky, except for the passage of the veiling .
So: note that these shots are made with Fuji X-T1 (and certainly it will be possible to have a greater definition and possibility to exploit even better the filter with more performing and higher-end machine bodies), it can be said that the PureNight Filter is a generic LP filter that works really well without being as aggressive as other LPs on the market? The answer is yes … without a doubt. Merit of excellent coatings (and not very influential) but also and above all from the glass in neodymium (glass, not film inserted between the plates).
– Giovanni Corona
To view some of Giovanni’s other works, here’s the link to his website.