![\"Green](\"http:\/\/www.pmstudios.co.uk\/blog\/wp-content\/uploads\/2014\/07\/E14_4868.jpg\")
<\/a>I have experimented with this and managed to remove a lot of the green cast by adjusting the raw image with the raw image converter and exporting the resultant image (in this version as a jpg file – I have also tried tiff files):<\/p>\nBut what use is such a filter? I see two main uses:<\/p>\n Now I have got the basics covered, I will give these a try.<\/p>\n Postscript:<\/strong><\/p>\n How did I fix the welding glass to a lens? I didn’t want to risk cutting the glass so I attached it to an old Cokin filter holder:<\/p>\n Welding glass makes for a cheap, dense, ‘big stopper’ type filter. Unfortunately, it gives a deep green cast to the image: I have experimented with this and managed to remove a lot of the green cast by adjusting the raw image with the raw image converter and exporting the resultant image (in this version as … Continue reading “Increasing exposure times”<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,65],"tags":[],"class_list":["post-3673","post","type-post","status-publish","format-standard","hentry","category-photography","category-technical"],"_links":{"self":[{"href":"https:\/\/www.pmstudios.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/posts\/3673","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.pmstudios.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.pmstudios.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.pmstudios.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.pmstudios.co.uk\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3673"}],"version-history":[{"count":3,"href":"https:\/\/www.pmstudios.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/posts\/3673\/revisions"}],"predecessor-version":[{"id":3683,"href":"https:\/\/www.pmstudios.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/posts\/3673\/revisions\/3683"}],"wp:attachment":[{"href":"https:\/\/www.pmstudios.co.uk\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3673"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.pmstudios.co.uk\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3673"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.pmstudios.co.uk\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3673"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}<\/a>As you can see, most of the green cast has gone, along with most of the blue sky. However, I took a 3-exposure HDR set and got the following result using as input the 3 processed raw files which were exported as jpg files:<\/p>\n<\/a>This is beginning to look like a more natural image, but it could do with a bit of tweaking:<\/p>\n<\/a>Here, I have managed to recover the blue sky and recoloured the green grass. Not a bad result considering the state of the original images.<\/p>\n\n
<\/a>For this, I used ‘Chemical Metal’ as an adhesive to attach the filter to the front of the filter holder – this makes an almost permanent fixing. I then used black ‘Sugru’ (brilliant stuff!) to fill the gaps top and bottom to reduce the risk of glare from the sun – this is shown in close-up below:<\/p>\n<\/a>And this is what it looks like attached to the camera:<\/p>\n<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"