[visionlist] Low cost photometer/colorimeter

[McCourt, Mark]

Right, invariant with distance provided that the source or surface in question completely fills the aperture of the photometer. 

-----Original Message-----
From: visionlist [mailto:visionlist-bounces at visionscience.com] On Behalf Of Jeff Mulligan
Sent: Thursday, March 23, 2017 11:07 AM
To: visionlist at visionscience.com
Subject: Re: [visionlist] Low cost photometer/colorimeter

On 3/23/17 8:13 AM, Georgeson, Mark A wrote:
>
> Comment: since luminance is invariant with distance, it shouldn't 
> matter in principle what distance the meter is at.

insert "for extended sources"---------------------^

True enough for full-field displays, but maybe not for single pixels.



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