Monday, February 18, 2013

Soligor / Kyoei 105mm lens for reflected UV photography II

Here again about the Soligor (also sold as Kyoei) f3.5 / 105mm, a quite capable lens for reflected UV photography I have written before here. This time in comparison with my all day UV lens, the CERCO 94mm quartz fluorite lens. I'm using a yellow/red Phalaenopsis flower for that and my "work horse" UV filter, the Baader-U filter plus the deeper reaching Jupiter-U filter. Light source was an UV enhanced Xenon flash. All shots done at f8 and presented on a side-a-side format for easier comparison, left the Soligor, right the CERCO lens.

[click on image to see a larger one]

Visible light image:

UV image using Baader-U filter (approx. 320-395nm, effective peak approx. 375nm):

UV image using Jupiter-U filter (approx. 280-385nm, effective peak approx. 365nm):

Also this comparison confirms, that it is a very sharp and seemingly deep into UV reaching lens, with only some 0.9% focal shift. Of course it does not reach as deep into UV as the CERCO lens, but nevertheless quite a useful lens!

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

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