eye4invisible Posted November 4, 2019 Share Posted November 4, 2019 I've been experimenting with some dichroic glass (also known as gobo projector glass, typically used for architectural lighting). Discovered an aerochrome-esque rendition when stacking the green dichroic glass with KG3. For comparison, I took 4 shots:Visible (to compare the IR tones to the various species of trees)Dichroic green 55mm x 0.7mm thickDichroic green 55mm x 0.7mm thick + Schott KG3 52mm x 2mm thickHrommagicus 52mmAll shots were taken on my full spectrum Sony A7 with the 28-70mm lens at 70mm, and with the camera in APS-C mode (so, no discolouration around the periphery of the images). The only post processing done was a light exposure adjustment, straightening, cropping and re-sizing. It was a bit cloudy, so the tones are a little muted, but it was still a worthwhile experiment. Visible (f/5.6. 1/400s, ISO 100): Dichroic green (f/5.6. 1/200s, ISO 100): Dichroic green + Schott KG3 (f/5.6, 1/80s, ISO 100): Hrommagicus (f/5.6, 1/30s, ISO 100): Opinion: the Hrommagicus is still a better filter for the rendition of reds SOOC. I am able to achieve some reds SOOC with the dichroic green stacked with KG3, however the aquamarine tone to the sky means a little more editing. Still, not bad for a $3.00 piece of dichroic glass when stacked with KG3, and I think I would have got more reds if I had taken this in the summer. Link to comment
Cadmium Posted November 4, 2019 Share Posted November 4, 2019 Andy, nice autumn foliage tests.The only such dichroic filter I have tried this way is the Lee C47, special order yet inexpensive enough, but like many other filters produces orange foliage.https://www.leefilte...#C47&filter=dgf example, of course this was not shot in the autumn, more like May I think.https://www.ultravio...-1557448713.jpg https://www.ultravioletphotography.com/content/index.php/topic/3263-lee-729-183-c47-dichroic-compared/page__view__findpost__p__27376 Link to comment
eye4invisible Posted November 4, 2019 Author Share Posted November 4, 2019 Andy, nice autumn foliage tests.The only such dichroic filter I have tried this way is the Lee C47, special order yet inexpensive enough, but like many other filters produces orange foliage.Yes, Lee calls it turquoise, but I suspect it's the same/similar tone to my cyan dichroic glass - renders oranges much like the IRChrome. I need to run some more stacking tests - perhaps cyan + KG3. Link to comment
Andrea B. Posted November 6, 2019 Share Posted November 6, 2019 somebody please remind me again what is the Hrommagicus and how did it get that name? thx!! :lol: Link to comment
dabateman Posted November 6, 2019 Share Posted November 6, 2019 somebody please remind me again what is the Hrommagicus and how did it get that name? thx!! :lol: Thats Cadmium being funny. See here:https://www.ultravioletphotography.com/content/index.php/topic/3295-hrommagicus/page__st__20 Chrome magic, to ruin it for you. Or IR chrome magic. I still like my bad der filter. Seems to be the baddest uv filter. Link to comment
Cadmium Posted November 6, 2019 Share Posted November 6, 2019 Andrea, Hrommagicus is the name that Ninjin (Evgeniya) created for the 729 + KG3 stack (Chrome + Magic), I like the name.David, the 'Chrome' refers to the original Kodak film, Kodachrome, Ektachrome, and in this case Aerochrome.Blue = Visible Blue, Green = Visible Green, Red = IR (using a full spectrum camera white balanced on a gray card, such as WhiBal, SOOC, no processing). Link to comment
Cadmium Posted November 9, 2019 Share Posted November 9, 2019 Forbidden Planet (1956 movie) featured red foliage and green skies: Link to comment
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