Friday, June 30, 2017

Petri Kuribayashi 35mm vs Kyoei E-Acall 50mm lens for reflected UV photography VII

Today a spectrometric test using that previously mentioned Petri Kuribayashi f3.5/35mm lens, compared to a recently found Kyoei E-Acall f3.5/50mm enlarger lens, as a proof that both actually have a very useful lens transmission, especially in UV.

[click on image to see a larger one]

The Kuribayashi 35mm still reaches deep into UV, even a bit below 320nm and shows a rather high UV at 365nm transmission of over 80%. However the Kyoei E-Acall f3.5/50mm enlarger lens seems to be quite similar, reaches beyond 320nm too and has a tad above 70% UV transmission at 365nm, so another useful addition to the rather short list of UV capable lenses. It has a different blueish coating, compared to the golden coating the 35mm Kuri has, hence suppressing a bit the blue and UV area.

I will test how it performs as a UV taking lens soon, time permitting.

I have written about those lenses before HERE

Stay tuned, more will follow on that fascinating subject...

More info on this very interesting field may be found on my site