The Fujinon company can produce sensational anti-reflection coatings. We found out that much testing the Fujinon 7×50 FMT-SX binocular and our expectations regarding the transmission level of Fujinon lenses were high. Let’s see how the transmission graph, depending on the wavelength, looks like.
The maximum transmission reaches a value of 94%, pretty high, and that level is kept in quite a large range of spectrum ensuring the right colour rendering. Still you can notice a slight loss of blue and purple light which might turn the light, getting through the optics, slightly yellowish.
To assess the efficiency of the coatings, used by Fujifilm, we can’t look at the overall transmission of the lens (because it doesn’t depend solely on the quality of coatings but also on the number of air-to-glass surfaces which should be covered by them) but at the efficiency of coatings on one air-to-glass surface. In the case of the Fujinon XF 35 MM F/1.4 R we deal with six groups of glass elements so twelve such surfaces. The overall transmission, reaching 93-94%, means the tested lens loses 0.5-0.6% of light on one surface. This result is not something which can bowl you over. The Fujinon itself showed than in FMT-SX series of binoculars it can use coatings which lose just 0.2-0.3% on one surface and such is a level you can demand from the most reputable producers. If those coatings had been used, the Fujinon’s 1.4/35 transmission level would have reached a sensational level of 97-98%.
When it comes to the work against bright light it can be assessed as good – perhaps not very good or excellent but good for sure. At the maximum relative aperture it is difficult to catch any artefacts. They appear only on significant stopping down as characteristic streaks of light and burn-out areas but only if the sun is almost exactly in the frame corner. It can be seen very well in photos below.
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