colinbm Posted April 29 Share Posted April 29 UVC 255nm Table Salt. Sigma fp mono converted with UV Nikkor 105nm Lens filtered with Asahi ZUV0325. Lighting with 2x 255nm LEDs. Table salt in a 90mm UVC Petri dish with white PTFE behind. Link to comment
colinbm Posted April 29 Author Share Posted April 29 For the inquisitive.... 2sec exposure & f22 Link to comment
Andy Perrin Posted April 29 Share Posted April 29 Neat! Why did you stop down all the way to F/22? Does the image keep getting sharper still as you stop down at that wavelength? Link to comment
colinbm Posted April 29 Author Share Posted April 29 Yes sharpness & depth of field. I did one at f5 but I didn't like it. I have another 5 samples of salt & sugar to do individually next, so I will spend some extra time on each & see if I can improve ? Link to comment
colinbm Posted April 29 Author Share Posted April 29 @Alaun UVC ie fused silica Petri dish. Link to comment
dabateman Posted April 29 Share Posted April 29 Great. I would like to see sugar. I still need to test mine. Link to comment
colinbm Posted April 30 Author Share Posted April 30 @dabateman @Andy Perrin I have re-taken the Table Salt with the same settings as the White Sugar & this looks much better, I think. Link to comment
Alaun Posted April 30 Share Posted April 30 23 hours ago, colinbm said: @Alaun UVC ie fused silica Petri dish. Ok, thank you Link to comment
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