On Nov 11, 2013, at 6:14 PM, Darren Addy wrote:

> ...and now I know...
> http://scotchtape.ductwhisky.com/2013/11/pentax-k-5-ii-and-strong-filters.html
> 

I have a very slow cranky web connection tonight so I haven't linked to your 
video. But the reason to use a viewfinder cover is that light coming through 
the viewfinder can/will affect the light meter reading of scene brightness. If 
you have the camera on a tripod (with your eye presumably not tight against the 
viewfinder) and AE turned on and nothing blocking the viewfinder, then you'll 
get a false reading, particularly in a situation with light coming from behind 
you. Not a problem is you use manual exposure.

stan


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