Talk:Photopsin

Untitled
It seems that the Rhodopsin article has much of the same information and is more complete.

Wavelength or frequency?
This article, like all literature on the subject, treats the -opsins in terms of wavelength. But is it wavelength they are sensitive to, or frequency? The law of refraction states that EM frequency remains the same, but wavelength does not, across a transition medium. The frequency of a particular light emitted in vacuum, which crosses into air, and then vitreous humor, is constant. The wavelength is not. --76.217.90.99 01:15, 4 May 2007 (UTC)

In birds and other animals
The photopsins that exist in humans are not the only ones that exist. Could anyone name the UV-sensitive photopsin that gives birds their tetrachromacy? Are there any infrared-sensitive photopsins? If so, what animals use them? What genes are responsible for producing various photopsins, and what are the precursor chemicals? 71.202.31.63 (talk) 04:02, 1 September 2011 (UTC)

Molecular Structure
Why no mention of the molecular structure?75.129.91.157 (talk) 08:12, 7 December 2013 (UTC)

Why does "porphyropsin" redirect here?
Is it a synonym? Equinox ◑ 23:11, 21 May 2017 (UTC)
 * The redirect in non-sense, porphyropsin is rod-opsin with covalently bound 11-cis-retinal-2 while rhodopsin is rod-opsin with covalently bound 11-cis-retinal-1. Two different things, if it all it should redirect to rhodopsin. -- Martin Gühmann (talk) 01:38, 3 December 2021 (UTC)