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UltravioletPhotography

TODAYS FLOWERS


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all the photos were taken with Sony A7 f.s. + Nikkor-H 50 f:2 - @ f:8

 

standard vision (BG39) and UV (BG39+BG25)

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the first with red filter A25 - 580nm

the second without filters

the third with BG39

the fourth with BG39 + BG25

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These were an interesting set of images using different filter combinations.

 

A comment about your A25 filter.

The A25 designation is originally from the Wratten gelatin sheet filter way of naming.

A25 has been used for many different filter brands with glass filters.

I think the cut on wavelength normally is closer to 590-595nm but might be wrong about that

 

590nm red filters are often used for Goldie style landscape IR-photography with converted cameras.

https://www.google.com/search?q=goldie+ir&oq=goldie+ir&aqs=chrome..69i57j0j0i22i30j0i10i22i30j0i22i30l3j69i65.7703j0j4&sourceid=chrome&ie=UTF-8

 

Well done Toni!

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These were an interesting set of images using different filter combinations.

 

A comment about your A25 filter.

The A25 designation is originally from the Wratten gelatin sheet filter way of naming.

A25 has been used for many different filter brands with glass filters.

I think the cut on wavelength normally is closer to 590-595nm but might be wrong about that

 

590nm red filters are often used for Goldie style landscape IR-photography with converted cameras.

https://www.google.c...chrome&ie=UTF-8

 

Well done Toni!

 

 

Thanks Ulf W

the red filter is a glass that I bought as a student 48 years ago with my first reflex.

it is branded Vivitar R 25A I used it with black and white photographic film.

I also have Kodak Wratten filters in 10x10 cm sheets N ° 87 and 87C BLACK they produce great BW photos but they are problematic to use

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  • 1 month later...

today I went to a large plant and flower nursery with my A7 f.s.

(one shot with BG39 alone and one with BG39 + BG25)

looking for UV signals

I only found these potted flowers

(zinnias were in the cold room with neon light) :-)

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You are getting these images with no flash?

I normally get around 40 - 50 times faster exposure time with a BG25 stack, like the one Photoni used above, than with a proper UV U-360 based stack.

 

The telltale for BG25 and BG3-stack based images is that UV false yellow flowers often turn red like the examples above.

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  • 10 months later...

once again this year it has flourished it should be an Echinocereus subinermis plant

Soligor 35mm f: 11

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  • 2 weeks later...

Cactus flowers are so intriguing. That small plant has produced such large flowers!

 

R72 is one of my favorite IR filters. It can produce lovely delicate tints.

Nice work as always, Toni.

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