The anti-reflexive coatings of the Pentax and the blackening the inside part of its tubus make the performance against bright light very good. You can notice some small and weak artifacts but they don’t constitute a serious problem.
It is worth having a look at the transmission graph to see how well fare the legendary SMC coatings. It is clear that in the case of a cheap kit lens you save on whatever you can because the results are not sensational although they are not very bad either. In the red part we reach the level over 90%. In the middle of the visible spectrum range we note a decrease to the proximity of 85% and by the blue edge the results decrease to the level of about 82% ;by violet the decrease is even more steep.
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