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Photography Q&A
calculating "darkness factor" of IR filter
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<blockquote data-quote="Fred Kingston" data-source="post: 763343" data-attributes="member: 10742"><p>Kolari says a 720nm filter is 10 or more stops difference. I'd start with 10 stops and go from there. Your first project should be to determine how many stops your filter is, along with practicing how to focus/meter a scene, adjust your camera's settings, and then add the filter and shoot. Realizing that it's almost impossible to see thru the viewfinder with the filter in place, it take some practice in focusing and then screwing on the filter without moving the focus. Use that time/effort to test your filter's darkness with your camera's different metering modes. </p><p></p><p>I put the over/under at about 50 shots doing the above before you get tired of that and start looking for a second camera to convert. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></p></blockquote><p></p>
[QUOTE="Fred Kingston, post: 763343, member: 10742"] Kolari says a 720nm filter is 10 or more stops difference. I'd start with 10 stops and go from there. Your first project should be to determine how many stops your filter is, along with practicing how to focus/meter a scene, adjust your camera's settings, and then add the filter and shoot. Realizing that it's almost impossible to see thru the viewfinder with the filter in place, it take some practice in focusing and then screwing on the filter without moving the focus. Use that time/effort to test your filter's darkness with your camera's different metering modes. I put the over/under at about 50 shots doing the above before you get tired of that and start looking for a second camera to convert. ;) [/QUOTE]
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Photography Q&A
calculating "darkness factor" of IR filter
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