photoni Posted July 12, 2021 Share Posted July 12, 2021 all the photos were taken with Sony A7 f.s. + Nikkor-H 50 f:2 - @ f:8 standard vision (BG39) and UV (BG39+BG25) Link to comment
photoni Posted July 12, 2021 Author Share Posted July 12, 2021 the first with red filter A25 - 580nmthe second without filtersthe third with BG39the fourth with BG39 + BG25 Link to comment
ulf Posted July 12, 2021 Share Posted July 12, 2021 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! Link to comment
photoni Posted July 12, 2021 Author Share Posted July 12, 2021 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 Wthe 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 Link to comment
colinbm Posted July 12, 2021 Share Posted July 12, 2021 These are fantastic Toni, & the flowers are all beautiful. Link to comment
photoni Posted August 18, 2021 Author Share Posted August 18, 2021 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 signalsI only found these potted flowers(zinnias were in the cold room with neon light) :-) Link to comment
microbat52 Posted August 18, 2021 Share Posted August 18, 2021 Oooh so cool. Love love love the zinnias. You are getting these images with no flash? Link to comment
Andy Perrin Posted August 19, 2021 Share Posted August 19, 2021 microbat, I think his filters are partly UV and partly blue light, so the exposure is much faster. Link to comment
ulf Posted August 19, 2021 Share Posted August 19, 2021 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. Link to comment
photoni Posted July 1, 2022 Author Share Posted July 1, 2022 once again this year it has flourished it should be an Echinocereus subinermis plant Soligor 35mm f: 11 Link to comment
colinbm Posted July 2, 2022 Share Posted July 2, 2022 Well done Toni You certainly got a UV dark one there. Link to comment
Andrea B. Posted July 12, 2022 Share Posted July 12, 2022 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. Link to comment
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