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UltravioletPhotography

Gazania rigens [Gazania]


Andrea B.

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Blum, A.G. (2014) Gazania rigens (L.) Gaertn. (Asteraceae) Gazania. Flowers photographed in ultraviolet and visible light. http://www.ultraviol...rigens-gazania/

 

Synonyms:

  • Treasure Flower
  • Orthonna rigens L.
  • Gorteria rigens L.
  • Gazania splendens hort. ex Hend. & A. A. Hend.

Comment:

Gazania rigens is native to South Africa. The cheerful Gazanias developed for commercial sale in plant nursuries feature a variety of colours and patterns. Interestingly, in Ultraviolet light the flowers also have a variety of UV signatures and false colours.

 

Reference:

1. Missouri Botanical Garden (2014) Gazania rigens http://www.missourib...kempercode=a517

 

Set 1

Middletown, New Jersey, USA

17 June 2010

Cultivar in home garden

 

Equipment [Nikon D700-broadband + Novoflex 35mm f/3.5 Noflexar]

 

Visible Light [f/8 for 1/500" @ ISO 800 in Sunlight with Baader UVIR-Block Filter]

gazaniaRigensVis061710wf_2949pfCrop.jpg

 

Ultraviolet Light [f/8 for 1.3" @ ISO 800 in Sunlight with Baader UV-Pass Filter]

Note that some flowers have a UV-dark central bullseye with a brighter inner ring around the disk.

These bullseye flowers have brighter ray tips which vary in false colour - white, blue or yellow.

One flower has UV-dark rays with a bright edge (on the left).

Another flower has almost wholly UV-dark rays with false yellow tips on some petals (in the back).

See Set5 and Set 6 in the following posts for a Gazania having UV-striped rays.

gazaniaRigensUV061710wf_2945pfpnCrop.jpg

 

Ultraviolet Light [Alternate false colour rendition of preceding photo]

gazaniaRigensUV061710wf_2940proofCrop.jpg

 

Infrared Light [f/8 for 1/320" @ ISO 800 in Sunlight with B+W 092 IR-Pass Filter]

Gazania rigens is one of the very few flowers which shows some patterning in Infrared light.

The proximal end of each ray has an IR-dark patch. Together these patches form an IR-dark ring around the disk.

The IR-dark area seems to match the visible brown ring around the disk.

gazaniaRigens092IR061710wf_2958proof2.jpg

 

Infrared Light [Alternate false colour rendition and different crop of preceding photo]

gazaniaRigens092IR061710wf_2958proof1Crop.jpg

 

Set 2

Middletown, New Jersey, USA

21 June 2010

Cultivar in home garden

 

After seeing the interesting IR-dark patches in Set 1 made using the B+W 092 IR-pass filter

which leaks some visible red light before its cut-in at 720nm,

I gathered some petals from my Gazanias for a closer look to see whether

the IR-dark patches were still visible under a stronger B+W 093 IR-pass filter

which passes IR only.

 

Equipment [Nikon D700-broadband + Carl Zeiss 60mm f/4.0 UV-Planar]

 

Visible Light [f/11 for 1/60" @ ISO 800 with onboard Flash and Baader UVIR-Block Filter]

gazaniaRigensPetalsVisFlashIncan062110wf_3511orig.jpg

 

Infrared Light [f/11 for 1/30" @ ISO 800 with onboard Flash and B+W 092 IR-Pass Filter]

Both sets of rays show the IR-dark patches in the mixed Red + IR light.

gazaniaRigensPetals092IRFlashUniWB062110wf_3496orig.jpg

 

Infrared Light [f/11 for 1/10" @ ISO 800 with onboard Flash and B+W 093 IR-Pass Filter]

The rays on the left from the yellow Gazania show the IR-dark patches in IR-only light.

The rays on the right from the white Gazania may have the faintest shadow of these patches,

but it is not at all obvious.

gazaniaRigensPetals093IRFlashIncan062110wf_3508orig.jpg

 

Set 3

Middletown, New Jersey, USA

22 June 2010

Cultivar in home garden

 

Equipment [Nikon D700-broadband + Carl Zeiss 60mm f/4.0 UV-Planar]

 

Visible Light [f/11 for 1/640" @ ISO 400 in Sunlight with Baader UVIR-Block Filter]

gazaniaRigensVis062210wf_3580pf.jpg

 

Ultraviolet Light [f/11 for 2.5" @ ISO 400 in Sunlight with Baader UV-Pass Filter]

A light leak through the viewfinder has brightened the corners of this photo.

gazaniaRigensUV062210wf_3602pf.jpg

 

Infrared Light [f/11 for 1/250" @ ISO 400 in Sunlight with B+W 092 IR-Pass Filter]

gazaniaRigens092IR062210wf_3588pf.jpg

 

Infrared Light [f/11 for 1/40" @ ISO 400 in Sunlight with B+W 093 IR-Pass Filter]

gazaniaRigens093IR062210wf_3594pf.jpg

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Continued from preceding post.

 

Set 4

Middletown, New Jersey, USA

10 October 2010

 

Equipment [Nikon D700-broadband + Novoflex 35mm f/3.5 Noflexar]

 

Visible Light [f/8 for 1/13" @ ISO 400 in Sunlight with Baader UVIR-Block Filter]

gazaniaRigensVis_101010wf_10263pfCrop.jpg

 

Ultraviolet Light [f/8 for 4" @ ISO 1600 in Sunlight with Nichia 365 UV-Led]

The narrowband Nichia 365 UV-Led produces a different false colour appearance

as compared to UV photos made in sunlight or with a UV flash.

However, the central bullseye is apparent in this particular Gazania.

gazaniaRigensUV385Led_101010wf_10289pfCrop.jpg

 

Ultraviolet Light [f/8 for 1.3" @ ISO 1600 in Sunlight with Nichia 385 UV-Led]

Similar remarks hold for the Nichia 385 UV-Led.

gazaniaRigensUV365Led_101010wf_10313pfCrop.jpg

 

Infrared Light [f/8 for 1/320" @ ISO 400 in Sunlight with B+W 092 IR-Pass Filter]

gazaniaRigens092IR_101010wf_10224origpnpn.jpg

 

Set 5

Middletown, New Jersey, USA

23 May 2013

Cultivar in home garden

This is a view of the center of the cultivar Gazania rigens 'New Day Mix'.

 

Equipment [Nikon D600-broadband + Nikon 105mm f/4.5 UV-Nikkor]

 

Visible Light [f/11 for 1/125" @ ISO 400 with onboard Flash and Baader UVIR-Block Filter]

gazaniaRigens'NewDayMix'VisFlash_052313wf_12502pnpf.jpg

 

Ultraviolet Light [f/11 for 5" @ ISO 400 in Sunlight with Baader UV-Pass Filter]

In UV the rays have a central dark UV-stripe matching the visible red stripes.

The tiny disk flowers are UV-bright with a UV-dark center.

gazaniaRigens'NewDayMix'UVBaadSB14_052313wf_12532pnpf.jpg

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Continued from preceding post.

 

Set 6

Middletown, New Jersey, USA

11 August 2013

Cultivar in home garden

This is again the cultivar Gazania rigens 'New Day Mix'.

 

Equipment [Nikon D600-broadband + Asahi 85mm f/4.5 Ultra-Achromatic-Takumar]

 

Visible Light [f/11 for 1/400" @ ISO 100 in Sunlight with Baader UVIR-Block Filter]

gazaniaRigensVisSun_081113wf_13814pnpf.jpg

 

Ultraviolet Light [f/11 for 1/6" @ ISO 400 with SB-14 UV-modified Flash and Baader UV-Pass Filter]

gazaniaRigensUVBadSB14_081113wf_13840origpn.jpg

 

Infrared Light [f/11 for 1/1600" @ ISO 400 in Sunlight with B+W 093 IR-Pass Filter]

gazaniaRigens093IR_081113wf_13852pf.jpg

 

Set 7

Middletown, New Jersey, USA

11 August 2013

Cultivar in home garden

Here is a plain orange variety of cultivar Gazania rigens 'New Day Mix'.

 

Equipment [Nikon D600-broadband + Asahi 85mm f/4.5 Ultra-Achromatic-Takumar]

 

Visible Light [f/11 for 1/80" @ ISO 400 in Sunlight with Baader UVIR-Block Filter]

gazaniaRigensVisSun_081113wf_13862origpnpn.jpg

 

Ultraviolet Light [f/11 for 2.5" @ ISO 800 with SB-14 UV-modified Flash and Baader UV-Pass Filter]

gazaniaRigensUVBadSB14_081113wf_13868pnpfpn.jpg

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Well done. That new day mix is stunning.

That whole first group shot is awesome. I need to get a hold of some more of these. So fun to shoot.

I think I am going to flat press one of mine and let it dry & die for a bit and see if the signature remains. I have a feeling it will still be there but I want to confirm it.

Have you ever tried bringing them inside for the winter?

 

-D

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  • 7 years later...

Wow, those striped flowers in sets 5 & 6 are stunning in UV!  Close to the best examples of floral UV photography I have ever seen!

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