Easy to acquire test subject?

[Doug A]

Made a UV WB target by wrapping many layers of plummer's tape around a flat piece of cardboard. The full spectrum Pentax K-1 is able to set a custom WB with the Ioriginal Kyoei 35 clone and ZWB1(2mm)/BG38(2.3mm) filter set. The photos come out mostly B&W. Sometimes there are some blue tints. Dandelions do come out yellow with black bull's-eye center. Is this most the colors the lens and filter combo will produce?

 

Also managed to get the El-Nikkor original 135mm enlarging lens on the Pentax bellows. I like the filters fitting inside the bellows. Less flare and contrast loss.

 

Any potted plants that would help test these setup's color response? It needs to be readily available in a Midwestern US plant store. 

 

Oops, just found a 2015 sticky that lists some plants. Not sure which plant would produce the most colors in reflected UV photos.

Thanks,

Doug A

[Andy Perrin]

Sunflowers are always a good subject. 

[nfoto]

Helianthus species in general are good UV "test beds". However, be aware that many of the cultivars have rather broad  dark areas on their ray florets ('petals' which aren't petals), thus only the top of the rays may show a contrast colour.

[Kai]

Maybe my current post is here of interest:
Low-cost color chart for UV-A - Techniques, Tests & Gear - UltravioletPhotography

 

[Andrea B.]

Suflowers in a grocery store can very often be found year round.

[dabateman]

I think the responses are missing the point, except for Kai.  Doug wants a multi colored UV target.

From this test maybe  carrots and turnips might work for you:

https://www.ultravioletphotography.com/content/index.php?/topic/3762-my-salad/&tab=comments#comment-33930

[Andy Perrin]

Sunflowers ARE multicolored.