Pentax smc FA 43 mm f/1.9 Limited
9. Ghosting, flares and transmission
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Undoubtedly it is a very nice graph. A high and even level of 95-96% is kept from near 500 to 700 nm. A slight decrease is seen for shorter wavelengths but it is so insignificant that it shouldn’t have a visible influence on the colouring of the images.
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The best measure of effectiveness of any coatings is their efficiency on one air-to-glass surface. In the case of the tested Pentax there are 12 such surfaces. In order to get the transmission as high as 95-96% you can’t lose more than 0.4% on one of them. Such a result is good but perhaps not sensational because the smc coatings, considered one of the best on the market, have been able to perform better in our tests, having losses as low as 0.2-0.3%.
Good coatings along with a proper inner construction are the reasons why the lens works well against bright light. You can catch some artifacts in photos but they are not numerous and their intensity is not high.
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