The Law of Reciprocity in Photography: Part I

For over a year now I have been wanting to teach a photography workshop. This is finally happening next month.  In preparation for teaching the workshop I will be brainstorming on what information to cram into a 2 hour workshop. So, here we go:

RECIPROCITY LAW: Principal according to which the density of the image formed when an emulsion is developed is directly proportional to the duration of the exposure and the intensity of the light. (John Hedgecoe's Complete Photography Course)

Ok, so that probably doesn't make any sense in the modern digital era.  My understanding of the LAW of RECIPROCITY as it relates to photography is well stated here:

"Thus, once you have the correct level of light for perfect exposure you can choose to increase aperture by one stop and trade this off with a doubling of the shutter speed (halving of the shutter duration). Twice and much light coming in for half the time = same amount of light.

This allows the photographer to retain the same exposure but change either aperture or shutter for artistic or practical reasons.

In addition to this the photographer may wish to over expose or under expose. Understanding the law of reciprocity allows them to do this in a controlled and intuitive manner, understanding the exposure differences on the image PLUS the different changes to the depth of field or any motion blur increase or decrease." Trigwell, Keith. "Understanding Reciprocity in Photography." Web log post. Picture Correct. N.p., n.d. Web. <>.

Sacramento Real Estate Photography

Michelle Drewes is a commercial photographer now offering Real Estate photography services in the City of Sacramento and outlying areas.


Michelle offers crisp professional images that will catch the eye of your ideal buyer.  She offers a quick turn around time and competitive pricing.  To set up an appointment to have your properties photographed please email: or text to 415-517-9925


Calgary Avansino on

Being in a new location every day and meeting different people is why I love what I do. A while back I photographed Calgary Avansino for Vaunte.  Calgary is an editor at British Vogue and a mother of three. She also grew up about 10 miles from my childhood home.

Here is the feature I shot for Vaunte:


You can check out Calgary's website on health and fitness here:


Playing around with VSCO

I'm finally playing around with VSCO cam and filters.  I must admit, it is really fun to edit photos creatively on my phone while riding in the car on a road trip.

Cheetah is the New Black shot in Oak Park Sacramento with a Canon 5D MarkII, 50mm prime.

Cheetah is the New Black shot in Oak Park Sacramento with a Canon 5D MarkII, 50mm prime.

The Santa Ynez Valley shot from a moving vehicle on highway 101.

The Santa Ynez Valley shot from a moving vehicle on highway 101.

A Valentine's Day dinner with Ashley Bruhn of Hither and Thither

As you may or may not know I live in Sacramento, but all of my clients are in San Francisco and Los Angeles.  So, you can imagine how excited I was when Camille of Camille Styles asked if I would like to photograph Ashley of Hither and Thither in Davis, California.

It turns out that Ashley has an amazing mid-century modern home styled to perfection.  She was so sweet and such a pleasure to work with.  Here are a few of the photos: