Monday, February 21, 2011

White Lilly - a surprising lens find for UV and VIS w/o focus shift II

Well, a while ago I was doing these "Psychedelic Lilly" test shots here . Prior to that I had taken UV transmission tests of that very interesting lens family, which turned out to be very promising, reaching down to about 320nm (-3EV). Here now more about that.

These macro shots were done at f8, ISO400, 1/160s using Xenon flash, exposure adjusted using flash power control and ND filters. UV shots were done using the Baader-U filter.

[click on image to see a larger one]

Here now a VIS-UV differential:

quite a sharp lens with quite good UV transmission and hardly any focus shift, as the two overlaid images nearly perfectly match!

Here the VIS shot:

and the UV shot:

Finally now the VIS-IR differential:

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

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