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Learn By Doing Photography

Learn by Doing – Metering for green -2/3

Assignment #20 – Take a picture where the majority of your picture is green. Take your meter reading on the green. Once your meter reads correct adjust your exposure¬† -2/3 recompose for the composition you’re looking for and take the picture.

Last week at coffee Sarah had a great assignment – Try the sky brothers and their cousin Mr. Green Jeans that Bryan Peterson talks about on page 122-126 from the book Understanding Exposure by Bryan Peterson. This is one of my favorite books that talks about well understanding exposure. So for the next few weeks we are going to practice his techniques starting with Mr. Green Jeans!

Peterson says when taking a picture that has a lot of green you can meter off the green then adjust either your aperture or shutter speed so your exposure reads -2/3 stops from correct.

First off you have to know what a stop is so you can adjust -2/3. So here is some technical information that might help out.

What is a full stop shutter speed?

1s 1/2s 1/4s 1/8s 1/15s 1/30s 1/60s 1/125s 1/250s 1/500s 1/1000s
Most cameras will be on a 1/3 scale which means there are two steps between every full-stop

What is a full stop for your ISO?

ISO 100 200 400 800 1600 3200
You many or may not have a 1/3 scale for you ISO. 400 – 800 = 1 stop if your camera has 1/3 scale you will have 500 and 640 as well.

What is a full f stop?

f2 f2.8 f4 f5.6 f8 f11 f16 f22 f32
Same thing most cameras will be on a 1/3 scale which means there are two f stops between each full stop. So between f/8 and f/11 you will have f/9 and f/10.

Opening up – more light would be on the smaller side of the aperture like f2
closing down or stop down – less light which would be using a larger aperture like f32

Every stop is double or half the amount of light!

I did two pictures to show the difference… I think I will keep playing with this technique. There are so many different greens and situations, but I think it’s a cool trick!

On my walk this afternoon I took this picture exposed at -2/3

Exposed -2/3
Shutter Speed 1250

The next picture was exposed correctly!

Exposed correctly
Shutter Speed 800

Are you ready to find that perfect green? You can post at the bottom of this post or on DigitalCamFan FaceBook wall. If you have questions about “Learn By Doing” Please refer to the guideline page. If you have no questions post away!


Related posts:

Learn By Doing - Meter using dusky blue sky
Learn by Doing - Now to use Shutter Priority
Learn by Doing Photography - Leading Lines


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