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Learning
Photography Q&A
calculating "darkness factor" of IR filter
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<blockquote data-quote="lucien" data-source="post: 763335" data-attributes="member: 36292"><p>Hi I ordered a 720nm IR filter and I wanted to calculate how "Dark" the filter is going to be because I want to calculate how long I have to expose for . Sort of like ND filters have a # based system. ND 1 , ND 6 is there a formula for that? Do I have to find out by trial and error? 720nm = Nd 7? Something like that. I spoke to the conversion people and they don't have such a formula.</p><p></p><p></p><p>thanks,</p></blockquote><p></p>
[QUOTE="lucien, post: 763335, member: 36292"] Hi I ordered a 720nm IR filter and I wanted to calculate how "Dark" the filter is going to be because I want to calculate how long I have to expose for . Sort of like ND filters have a # based system. ND 1 , ND 6 is there a formula for that? Do I have to find out by trial and error? 720nm = Nd 7? Something like that. I spoke to the conversion people and they don't have such a formula. thanks, [/QUOTE]
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Photography Q&A
calculating "darkness factor" of IR filter
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