Alex H Posted May 6, 2014 Share Posted May 6, 2014 Here is an example of contamination by UV light while imaging UV-induced visible fluorescence of a unnamed variety of sunflower. There is also small contribution from visible light, but UV-contamination is clearly visible. Link to comment
colinbm Posted May 6, 2014 Share Posted May 6, 2014 Hi AlexCan you explain what / where the UV contamination is in this photo please ?Perhaps a side by side examples ?Col Link to comment
Johan Posted May 6, 2014 Share Posted May 6, 2014 I suspect the spill is the blue on the stem and leaves... I appreciate it's a spill, but I have to say it's a very attractive spill that adds to the image :) Link to comment
Alex H Posted May 6, 2014 Author Share Posted May 6, 2014 The "bullseye" pattern of the sunflower gets visible here due to recorded reflected UV. Link to comment
Johan Posted May 6, 2014 Share Posted May 6, 2014 ahhhhhhhhhh... ok that makes sense, thanks Link to comment
Andrea B. Posted May 6, 2014 Share Posted May 6, 2014 It may be "UV contaminated", but it is a lovely starlight photograph. Question: what blocking filter were you using ? It might leak some UV ?? Link to comment
Alex H Posted May 6, 2014 Author Share Posted May 6, 2014 Question: what blocking filter were you using ? It might leak some UV ?? I am not sure I understand the question, Andrea. What blocking filter we are talking about? Here are the settings of the shot:ISO - 3200exposure - 30 secondsillumination - 5W UV torch with Nichia chip filtered through UG11 filterlens - Sony E-mount 16mm F/2.8 lens set to F/8, no filter over the lens Link to comment
JCDowdy Posted May 6, 2014 Share Posted May 6, 2014 Alex, I thought you did that intentionally, am I confused? More so than usually I mean......... - JD Link to comment
Alex H Posted May 7, 2014 Author Share Posted May 7, 2014 It is difficult to say what exactly my intentions were when I took that shot. Link to comment
JCDowdy Posted May 7, 2014 Share Posted May 7, 2014 Alex, I agree with Andrea that the result is remarkable. Sometimes the process is the intention. Link to comment
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