Alley in Pisa, Italy

by Lars Kotthoff

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13
votes
2answers
798 views

What is the inverse-square law, and how does it apply to lighting for photography?

I hear photographers talk about the inverse-square law, particularly with reference to lighting. What is this law about, and most importantly, how is it applied to lighting for photography?
14
votes
2answers
6k views

What is the difference between luminance and illuminance?

The more I read about this, the more confused I become. Illuminance, as I understand it, measured in lux, is the perceived brightness of light on a surface. It's what you'd measure with an incident ...
4
votes
3answers
227 views

What's a fairly simple way of taking a photo through a microscope?

I have a simple microscope, with only one lens (though two eyepieces). Is there any way to do this, without too much money and modification?
7
votes
2answers
1k views

What is “solid angle” and how does it relate to photography?

So, I was hanging out in the chat room, and hear mention of something called "Solid Angle". What is this, and how can it be important?