>> >> This is 40 year old advice. Today it is not applicable. Modern lenses
>> >> do not pass UV light. It's because of the multicoating.
>> >> Old legends die hard.
>> >Then the legend must have made the passage through the time warp to add
>> >to my August 2002 shots from Croatian coast made with Pentax-F 50 f/1.4
>> >coating!) without UV or any other filter.
>> Here is a quote from Pentax's book "Takumar Lenses for the Asahi
>> Pentax", page 4:
>> "Super-Multi-Coating creates truer colours since light is transmitted
>> more evenly at each wavelength. Another benefit: the
>> Super-Multi-Coated lenses do not transmit the invisible ends of the
>> spectrum nearly as well. The happy, automatic result is a UV filter
>I've read this book, and I've seen other similar texts. I really wanted find
>out a reason for bluish cast. The only possible reason I came out is that:
>a. on that day, the air was unusually dry and clear as the cold front passed
>overnight with heavy storms
>b. the shots were taken at arround betweem 1pm and 3pm
>a. and b. combined means there was a *lot* of UV light arround. The SMC
>multicoating perhaps does not cut off *all* of the UV light but only a major
>part (if you read above statement carefully, the claim is "... not nearly as
>well" and not "...not at all". A combination of rather simple lens (6 groups
>only) and huge amount of UV arround could have resulted in just enough UV
>reaching the film to add a bit of blue.
>I cannot substantiate above claim in any other way but with my slides. I
>also had a similar experience later last year, and this slide:
>had to be made warmer in photoshop even though it was made with Sensia 100,
>which is considered to be a "warm" film.
> In any case, after last summer I'm using UV filter when shooting at the
>sideside during day and I haven't got bluish slides since.