Andrea B. Posted June 27, 2014 Share Posted June 27, 2014 Blum, A.G. (2013) More Examples and Fluorescence of Potentilla argentea L. (Rosaceae) Silver Cinquefoil. Flowers photographed in ultraviolet, visible and infrared light with fluorescence studies. http://www.ultraviol...d-fluorescence/ Comment:Rørslett (2013) first showed P. argentea in ultraviolet(1). Here are some more examples found in the US which also exhibit the characteristic UV-dark inkblot on the proximal petal end.Some UV-induced Visible fluorescence studies are included along with an experimental attempt to induce Infrared fluorescence. Reference:1. Rørslett, B. (2012) Potentilla argentea L. (Rosaceae) Hoary Cinquefoil. Flowers photographed in visible and ultraviolet light. http://www.ultraviol...ary-cinquefoil/ Set 1Middletown Township, New Jersey, USA14 May 2010Wildflower Equipment [Nikon D200-broadband + Carl Zeiss 60mm f/4.0 UV-Planar] Visible Light [f/11 for 1/15" @ ISO 500 with onboard Flash and Baader UVIR-Block Filter] Ultraviolet Light [f/8 for 1/2" @ ISO 500 with Nichia 365nm UV-LED and Baader UV-Pass Filter] UV-Induced Visible Fluorescence [f/8 for 3" @ ISO-500. Nichia 365 UV-Led + Baader-UV-Pass Filter. Lens + Baader UVIR-Block Filter. Photographed in Darkness.]Note: This photo has not been formally colour-calibrated, so the colours of the Fluorescence may not be entirely accurate. Possible UV-Induced Infrared Fluorescence? [f/8 for 2" @ ISO-500. Nichia 365 UV-Led + Baader-UV-Pass Filter. Lens + B+W 092 IR-Pass Filter. Photographed in Darkness.]This IR-pass filter reaches 50% transmission at 695nm and thus passes some Visible red wavelengths. I think that the photo is showing perhaps some induced Visible Red fluorescence which is also seen in the preceding Visible Fluorescence photo. I do not know whether there is any induced IR fluorescence in the photo. As in the Visible Fluorescence photo above, the UV markings can be seen.As in any IR photograph, the colour here is false. Infrared Light [f/8 for 1/45" @ ISO 500 with onboard Flash and B+W 092 IR-Pass Filter] Possible Fluorescence Induced by Nichia 365 UV-LED under B+W 093 IR-Pass FilterPossible UV-Induced Infrared Fluorescence? [f/8 for 30" @ ISO-500. Nichia 365 UV-Led + Baader-UV-Pass Filter. Lens + B+W 093 IR-Pass Filter. Photographed in Darkness.]This filter reaches 50% transmission at 830nm and should not pass any Visible wavelengths. I do not know whether this is induced IR fluorescence in the photo. As in the Visible Fluorescence photo above, the UV markings can be seen.As in any IR photograph, the colour here is false. Set 2Middletown Township, New Jersey, USA11 May 2010Wildflower Equipment [Nikon D200-broadband + Carl Zeiss 60mm f/4.0 UV-Planar] Visible Light [f/4.5 for 1/15" @ ISO 400 with onboard Flash and Baader UVIR-Block Filter] Ultraviolet Light [f/4.5 for 1/4" @ ISO 400 with Nichia 365nm UV-LED and Baader UV-Pass Filter] Visible Light [f/4.5 for 1/30" @ ISO 400 with onboard Flash and Baader UVIR-Block Filter]The characteristic silver-white underside of the leaf. Link to comment
Andrea B. Posted June 27, 2014 Author Share Posted June 27, 2014 Continuation of: Blum, A.G. (2013) More Examples and Fluorescence of Potentilla argentea L. (Rosaceae) Silver Cinquefoil. Set 3Southwest Harbor, Maine, USA26 July 2010Wildflower Equipment [Nikon D700-broadband + Novoflex 35mm f/3.5 Noflexar] Visible Light [f/11 for 1/2" @ ISO 400 with onboard Flash and Baader UVIR-Block Filter] Ultraviolet Light [f/11 for 1/4" @ ISO 400 with Nichia 365nm UV-LED and Baader UV-Pass Filter] UV-Induced Visible Fluorescence [f/8 for 2" @ ISO 800. Nichia 365 UV-Led + Baader-UV-Pass Filter. Lens + Baader UVIR-Block Filter. Photographed in Darkness.]Note: This photo has not been formally colour-calibrated, so the colours of the fluorescence are not accurate. Set 4Somesville, Maine, USA31 July 2010Wildflower Equipment [Nikon D700-broadband + Novoflex 35mm f/3.5 Noflexar] Visible Light [f/11 for 1/400" @ ISO 400 with onboard Flash and Baader UVIR-Block Filter] Ultraviolet Light [f/11 for 1/8" @ ISO 635 with Nichia 365nm UV-LED and Baader UV-Pass Filter] Link to comment
Damon Posted June 28, 2014 Share Posted June 28, 2014 Pretty cool!Are you using 1 UV light for the set 2 visflour pic? Link to comment
Andrea B. Posted June 30, 2014 Author Share Posted June 30, 2014 I don't recall whether I was using one or two Nichia UV-LEDs torches. Link to comment
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