enricosavazzi Posted June 12, 2019 Share Posted June 12, 2019 New on my site: http://www.savazzi.net/photography/UVwhiteBalance.html Link to comment
dabateman Posted June 12, 2019 Share Posted June 12, 2019 Interesting summary.I think finding a filter combination to get back the look of the stock camera is some what camera specific.My old full spectrum E510 did well with just a 486 filter, the auto white balance worked. However, this was not the case with my full spectrum converted Em1. My early best filter for auto white balance was a 4mm BG38 filter.However, using my same BaaderU custom white balance setting, my 2mm GRB3 filter, equivalent to a KG3 filter provides excellent back to normal colors. This is with sunlight.Using a white led with low IR, the 486 works on my Em1mk1. So lighting will matter. Link to comment
nfoto Posted June 12, 2019 Share Posted June 12, 2019 The BG40 apparently does well on my full-spectrum D600, at least with non-UV specialist lenses attached to the camera. I shoot my Colorchecker Passport and make a dedicated profile in Photo Ninja. Using the Baader UV/IR Cut filter on its own tends to produce a reddish cast that is difficult to get rid of. Haven't tried BG38 + UV/IR Cut yet on that camera -- might be worth a try in conjunction with the UV-Nikkor etc. Link to comment
Cadmium Posted June 13, 2019 Share Posted June 13, 2019 I tend to use BG38 alone, usually, it is a little redder than BG40, and BG40 works nice also, and I think BG40 works best for some other cameras than for mine.I don't stack Baader UV/IR-Cut with the BG38 or BG40, I have tried, and I didn't notice a difference.I always white balance from RAW(NEF) when shooting a visual shot on my UV/IR cameras anyway.But 90% of the time I use BG38, then white balance that from RAW.Some like BG40 better. It tends to look just a little bluer for me, maybe too blue.S8612 and BG39 are way too blue for me, and Baader UV/IR-Cut looks too red for me. Link to comment
ulf Posted June 13, 2019 Share Posted June 13, 2019 I agree with Steve.For my camera BG38 give the best results with simple white balancing even if the BG40 is not very different. Link to comment
eye4invisible Posted June 13, 2019 Share Posted June 13, 2019 I have never stacked any filters for vis - just used my Kolari Vision hot mirror filter (which I guess is the same as BG40) and set a new CWB without issue. Link to comment
enricosavazzi Posted June 15, 2019 Author Share Posted June 15, 2019 I don't stack Baader UV/IR-Cut with the BG38 or BG40, I have tried, and I didn't notice a difference.I don't see a difference either, with ordinary subjects. With my Sony A7 II I do see a difference if the illumination source is particularly NIR-rich (sunlight or incandescent lamps) and the subject is dark in VIS and NIR-reflective (especially some types of black cloth and velvet that I use as VIS-black background). Link to comment
Mark Jones Posted July 14, 2019 Share Posted July 14, 2019 Many UV images are only black white and blue in colors. It would be more exciting to use a debayered sensor with a red, green and Venus filter and then use photoshop to make each image the r, g and b (uv) channelsshould give some interesting full color/ false color looks. Link to comment
Andrea B. Posted July 17, 2019 Share Posted July 17, 2019 You can do that with a typical non-monochrome converted DSLR or mirrorless camera. Shoot the scene under the UV-pass filter and put that into the blue channel. Shoot the scene under the UV/IR-block filter and put that into the red channel and green channel. Or use red-pass and green-pass filters to shoot the red channel and green channel inserts. If you search on the Multispectral tag, you might find some of these stacks. Multispectral..For uv/vis/ir stacks or for mixed displays. Also on Ben Lincoln's site you can see multispectral stacking of every imaginable variety. Awesome stuff.https://www.beneaththewaves.net/Software/The_Mirrors_Surface_Breaks.html ***** Reminder: For accurate visible color from a photo made with Baader UV/IR-cut filter, BG 38, BG 39 or BG 40, be sure to make a color profile for the camera using that filter. White balance alone is not enough to restore accurate colour to a converted camera. Although you can get fairly close with WB alone. :D . Link to comment
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