Sunny 16 is not a 10:00 a.m. to 4:00 p.m. rule. It is a "two hours after sunrise to two hours before sunset" rule. If sunrise is 10:00 a.m. and sunset is 2:00 pm, then sunny 16 isn't going to work for you.
No,it's not.The purpose is to prove your statement wrong 'sunny 16' works from 10 am to 4pmalmost anywhere on the globe at all seasons,weather permitting of course and assuming properly working equipment; so far so good
The EV for sunny 16 is not EV15! As stated and assuming we're talking about ISO 100. The aperture is f/16 and the shutter speed is 1/100 that is equal EV 14 and 2/3.
I had one of those and I wish I knew what happened to it
Sunny 16 is f16 1/125 @EI100
I would also add that the further south in Australia you go the worse the UV gets. My worst sunburn was in Tasmania and I was only outside in sun for 15-20min. And that's from someone who grew up in QLD.
I assume you need a clear, sunny day with the sun unobstructed by clouds. But does time of day have an impact?
I wonder what explains this. It seem contrary to eveything I thought I had read. Isn't the "reductio ad absurdum" of this that in summer the worse place to be for sunburn is the South Pole. Come to think of it the South Pole might be bad because there is very little to prevent the UV rays penetrating the atmosphere. Might the same have been true of that day in Tasmania?
All I know is that the incidence of extreme sunburn is much greater for Scots who holiday in say Greece and don't take precautions than those who holiday in Scotland and don't take precautions, all other things being equal
Could your worst sunburn be caused by any other factors?
pentaxuser
the point of this exercise is how stable the light soutce sun actually is.
I have found these to be very accurate:
http://www.earlyphotography.co.uk/site/entry_E40-6.html
Steve.
I think your scientific experiment, although interesting, is flawed. How do you know all these light meters are giving correct readings? Some have got to be ancient. I know the hand held ones I own are creaking with age.
The earths orbit around the sun is elliptical, not circular.
There is definitely a bit of variation at higher latitudes because the light has to travel through more atmosphere, and there are of course effects from haze and pollution. The spectrum of course changes because of the atmospheric differences too - in Australia we have far more UV than Europe due to the antarctic ozone hole.
I recommend having a look at some of these surveys and their techniques and some of these insolation maps. The latter are derived for the purpose of budgeting PV solar cell outputs and therefore include annualised weather patterns (cloud etc) so you should ignore the variations wrt sea/land and longitude. However, they do show a strong and uniform variation in insolation with latitude. Some of the papers show the variation throughout the day, and on a clear day, you can expect about 15-20% difference between mid-morning and noon, depending on your latitude, which is about EV0.3 difference.
I get EV14.8 in Adelaide in mid-summer, and about EV14.3 in winter. When I travelled Europe (Prague, St Petersburg) in late summer, it was more like EV13.8. I'd be interested to see a reading from inside a polar circle.
PS Sunny 16 is EV 14.66 not 15. EV15 would imply f/16 1/125 @ EI100.
That cannot be true. Here in Finland at 4pm in December the sun has already long set. It´s night already.
How did you get to 14.66.I get an even 15 at f/16 and 1/100/s
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