Thanks for the advice guys all really helpful! I'm going to look up the sunny 11 rule, I'm confused about what you mean about the kodak grey?
18% Grey
White is 100%, Black is Zero %.. 'Kodak' Grey, or 'Neutral Grey' or 'standard' grey is 18% grey... ie something about 4/5th the way towards white from black,
And its the average brightness of a scene that most exposure meters are calibrated to, on presumption that usually, thats how bright most scenes are on average.
If you check the Tutorial on Exposure over in Tutorials, the 18% grey-scale metering method, is explained.
Basically, rather than hoping that what you are actually pointing a camera at DOES average out to 18% Grey brightness, you stick a bit of cardboard that has been painted a garanteed 18% grey in-font of teh camera to fill the frame; measure Exposure value off that... for the light falling on it... then take it away and take your picture.... cheapskates like me, simply point camera at a light-ish colour paving slab or similar, 'close' to 18% and see how different the meter reading is from whatever the scene we are snapping is.
If you have a look in Photo-Editor or other softeare you can pic colours or tones from palet, you are likely to find you can set an 18% grey on a slider bar.
Add on Ed.. found a picture for you.... l
Picture of snow on the ground... as exposed by camera, with 18% grey square next to it. As you can see, snow is almost pure white, 100%, so the camera has under-exposed trying to make the whole scene 18% grey. Beneath, adding one stop of exposure compensation, to 'over expose' from what the meter suggests, brings the white back to white. On dark subjects, say a picture of a lump of coal, would work the other way and meter would try and over expose to make the near black come out light grey, so you would deliberately under expose to compensate.
F16-Sunny Rule: in biref. Rough reckoner for assessing exposure setting without a meter. If its a clear sunny day, outside in indirect light, ie sund behind you, then at f16, setting the shutter speed to the same number as your film ASA / ISO setting will give 'about' the right exposure.
So, nice sunny, summer day, you have 100ASA film, you set appature to f16, and a shutter to same number as your film ASA.... 100th... of as close as.. 1/90th or 1/125th depending on what the shutter increments are, and you're exposures ought to be pretty close to whatever a hand held meter may say.
You can then use a bit of know-how and adjust the exposure up or down, if you are shooting something very bright, like say a beach, with very white sand, the light not quite over your shoulder and reflecting off the water, you may stop down a bit; use f22 or perhaps 1/250th to avoid over exposure; or vica versa, if you are shooting into shaddows, or something dark, you open the apature up or drop shutter speed to something you think a bit closer.
Ditto if the day is over cast, or its getting dark, or its hissing with rain... and you 'open up' to let more light in depending on how dary you reckon it is, by eye, compared to a suny day.
Your eye, being probably more sensative, an exposure meter, and your ability to judge colour and brightness of what you are pointing the camera at, probably far more acute than any cameras meter, if you practice at it a bit.
f11 sunny... is British Pessamism... we dont see bright sunny days very often, so opening up a stop for more usual
thred on it here:
Sunny Rule
Thread co-incided with a new light-meter arriving; so I added a reply, comparing meter-readings from my Nikon, the old Russian Light-Meter I had just bought, and the F16 rule, on photo of my driveway!
The rule provides pretty useful guide; but the 'lesson' is that your eye and experience, is worth as much as any meter, no matter how sophisticated or how integrated with the camera... and the F16 Sunny 'rule' is no more binding than the Exposure Values hand-held meter suggests, or the AE settings a camera might try and set for you.