BirdForum is the net's largest birding community dedicated to wild birds and birding, and is absolutely FREE!

Register for an account to take part in lively discussions in the forum, post your pictures in the gallery and more.

Reply to thread

Message: <blockquote data-quote="typo" data-source="post: 3150053" data-attributes="member: 83808">Chosun,I'd been hunting around various colour theory and colour perception articles trying to find an explanation why some binos, particularly those with very good short wavelength transmission appear to my eyes to produce a richer or possibly brighter colour palate. I found something called the Helmholtz-Kohlrausch effect that appear to at least to offer a partial explanation. I posted a bit more here:<a href="http://www.birdforum.net/showpost.php?p=3149517&postcount=63" target="_blank">http://www.birdforum.net/showpost.php?p=3149517&postcount=63</a>It looks like you might have muddled a couple of things up in point one. A wide field of view is not altered by the pupil of the eye contracting. When the pupil is dilated in low light, visual acuity is poor, when the light levels are higher your acuity is better and the DOF improves. I'd agree a sharp image and wider sweet spot appears brighter than a more blurred image, so when it is brighter, the view looks brighter.... but that's probably not helping.:-ODavid</blockquote>