Eremophila divaricata x polyclada [Summertime Blue]

[DaveO]

Oldfield, D. 2013. Eremophila divaricata x polyclada (Scrophulariaceae) Summertime Blue. Flowers photographed in visible and ultraviolet light. http://www.ultravioletphotography.com/content/index.php?/topic/644-eremophila-divaricata-x-polyclada-summertime-blue/

 

Place of origin of this hybrid: In the wild, on the flood plains of the Murray River, northwest Victoria It has been given the informal name of “Summertime Blue” by the horticultural industry.

 

Maldon, Victoria, Australia

14 December 2013

Australian Native Wildflower as Garden Specimen

 

Comment

This hybrid, which is widely grown in Australia and California, has the best features of both parents, large bright flowers and a mass display of lilac tinged with a deeper lilac, in summer.

 

 

Visible Light: Pentax K-5 Full Spectrum Modification, Nikon Rayfact PF10545 MF-UV 105 mm f/4.5 lens, Metz 15 MS-1 flash, 1/180 s @ f/16 ISO 200, B+W UV/IR Cut Filter.

Image Reference: DO51879

 

Ultraviolet Light: Pentax K-5 Full Spectrum Modification, Nikon Rayfact PF10545 MF-UV 105 mm f/4.5 lens, Nikon SB-14 flash, 1/180s @ f/16 ISO 200, Baader UV-Pass Filter.

Image Reference: DO51887

 

 

 

References:

Chinnock, R.J. Eremophila and Allied Genera, Rosenberg, 2007, p. 55.

Boschen, N., Goods, M. and Wait, R. Australia’s Eremophilas – changing gardens for a changing climate, Bloomings Books, 2008, p.243.

 

 

 

Published 25 December 2013

[Andrea B.]

I notice that the hairs in the throat of this Eremophila are UV-dark whereas most of the others show up as UV-bright.

Very interesting!! There are always surprises.

[DaveO]

Perhaps it was just the angle of the flash and the brighter reflections before were due to a greater degree of specular reflections.

 

Here's an earlier image, taken with the 105 mm quartz lens of another bush of the same species.

 

 

When I've been doing this for a few years I might be able to remove some of the variables.

 

Dave

[Andrea B.]

We know that the presence of conical cells on the surface of petals/corollas can cause reflective variations.

And, like you mentioned, the angle of the illumination is sometimes not optimal.

 

Perhaps when shooting try to make a few shots from different lens angles and flash angles to determine the "true" colours, so to speak, of a particular flower?? Of course this is easier said than done when the wind is wreaking havoc with the shoot and sweat is pouring down into your eyes and the bees want you to move off of their flower right now.

 

It's OK to add that 2nd shot to the original post as a second view of the flower's UV characteristics.

[DaveO]

Another set

 

Visible Light: Pentax K-5 Full Spectrum Modification, Nikon Rayfact PF10545 MF-UV 105 mm f/4.5 lens, Metz 15 MS-1 flash, 1/180 s @ f/16 ISO 200, Baader UV/IR Cut Filter.

Image Reference: DO54312

 

Ultraviolet Light: Pentax K-5 Full Spectrum Modification, Nikon Rayfact PF10545 MF-UV 105 mm f/4.5 lens, Nissin Di866 Mark II flash, 1/180s @ f/16 ISO 200, Baader UV-Pass Filter.

Image Reference: DO54315

 

Ultraviolet Induced Visible Fluorescence: Pentax K-5 Full Spectrum Modification, Nikon Rayfact PF10545 MF-UV 105 mm f/4.5 lens with Baader UV/IR Cut Filter, Nichia NCSU033A UV-LED with Baader UV-Pass Filter, 30.0 s @ f/11 ISO 200.

Image Reference: DO54317

 

Published 11 March 2015

[colinbm]

Excellent Dave, you seem to have a system now.

Col

[DaveO]

Thanks Col,

 

It gives me something to do repeating previous shots with the inclusion of UVIVFL as the flowers occur.

 

Dave