View Full Version : Will we need to change the 'Sunny 16' Rule?
bsdunek
04-02-2009, 06:49 AM
Seems our sun activity seems to continue to lessen - the sun's brightness has dropped by 0.02% at visible wavelengths and 6% at extreme UV wavelengths since the solar minimum of 1996. Guess I'll break out the Tri-X and FP5.
http://science.nasa.gov/headlines/y2009/01apr_deepsolarminimum.htm
Steve Smith
04-02-2009, 06:54 AM
Yes. Its now the sunny f15.9968 rule.
Actually, in the UK it's usually closer to the sunny f11 rule.
Steve
Christopher Walrath
04-02-2009, 07:52 AM
Wirelessly posted (BlackBerry9000/4.6.0.167 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/102 UP.Link/6.3.0.0.0)
Today in Delaware it's f/8 and be there.
BWGirl
04-02-2009, 08:00 AM
Seems our sun activity seems to continue to lessen - the sun's brightness has dropped by 0.02% at visible wavelengths and 6% at extreme UV wavelengths since the solar minimum of 1996. Guess I'll break out the Tri-X and FP5.
http://science.nasa.gov/headlines/y2009/01apr_deepsolarminimum.htm
Ah, come on Bruce! You're in Michigan... the sun hardly ever shines there anyway! :D:D (said the former Kalamazoo native) ;)
keithwms
04-02-2009, 08:01 AM
Bruce, I doubt that fluctuations in the UV/xray wavelengths measured from space imply any change in the visible spectrum on terra firma. But I'd better let the astronomers amongst us comment on that. Anyway, local atmospheric conditions are always going to be far more important (as Steve and Chris duly noted!) ....
BobNewYork
04-02-2009, 08:53 AM
So how soon do we get to the "Sunny and Reciprocity Correction Rule" ?
Will we be using calendars instead of shutter speeds?:D:D:D
On a serious note - is this the slow dying of the sun, or is it something else?
Bob H
Around here (Tucson, Az. ) we use the sunny 22 rule.
BobNewYork
04-02-2009, 09:09 AM
Around here (Tucson, Az. ) we use the sunny 22 rule.
That's a horrible thing to say to us Northeasterners trying to claw our way out of winter. :p:p
Bob H
tessar
04-02-2009, 09:35 AM
Actually up here in sunny Alberta, the sunny 11 rule is right most of the time, just like in rainy Britain. Sunny 16 only seems to apply for distant views at the brightest time of day.
That's a horrible thing to say to us Northeasterners trying to claw our way out of winter. :p:p
Bob H
Sorry. But we here in the southwest suffer too! Just last night we suffered through a frigid 60 degree overnight and now we will have to find shelter from the blistering 80 degree sunshine.
It's tough. Sigh. :D
jasonhall
04-02-2009, 11:00 AM
Here in South Carolina the Sunny 16 works very well during all but mid summer...then its closer to f22. But with hazy skys and terrible humidity, who wants to photograph anything anyway. I can only image what it is like in Tucson. But right now...its 40s to 50s at night and about 70 during the day. Other than the pollen, its darn near perfect.
Jason
BobNewYork
04-02-2009, 11:11 AM
My hear just bleeds for you guys - NOT!! :D:D
Bob H
Christopher Walrath
04-02-2009, 12:06 PM
Wirelessly posted (BlackBerry9000/4.6.0.167 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/102 UP.Link/6.3.0.0.0)
In Delaware, Sunny 16=Tourons. Can't get within ten miles of the beach without walking on heads. (APUGers excluded, of course.)
2F/2F
04-02-2009, 12:36 PM
I dunno. Consult an incident light meter if you want to find out. There will be far more variation by guessing day to day to than there will be general light loss due to what you mentioned. Sunny 16 is not intended to be perfect. It is intended to give you a printable exposure. It is only *just* right on a perfectly clear and sunny day. Even then, it depends on where you are in the world. It tends to be sunny 11 or 11-1/2 around here on most days that look sunny.
Sirius Glass
04-02-2009, 01:02 PM
Sorry. But we here in the southwest suffer too! Just last night we suffered through a frigid 60 degree overnight and now we will have to find shelter from the blistering 80 degree sunshine.
It's tough. Sigh. :D
Yes, we have been experiencing a cold snap. Now we are waiting until 10:00 AM before it climbs up to 75 degrees, so we are forced to wear sweaters for part of the day.
Sirius Glass
04-02-2009, 01:04 PM
PE,
What does Rochester New York use for Sunny 16? We know that George Eastman founded Eastman Kodak in Rochester because Rochester is the world's largest natural darkroom.
Steve
Vaughn
04-02-2009, 01:12 PM
What is this condition you call "sunny"?
...from behind the Redwood Curtain...
Vaughn
bowzart
04-02-2009, 03:08 PM
It's been soggy 8 around here for some time now.
keithwms
04-02-2009, 03:15 PM
What is this condition you call "sunny"?
...from behind the Redwood Curtain...
Vaughn
Are the redwoods any good in late May? I am thinking of popping over then.
Sirius Glass
04-02-2009, 03:58 PM
Are the redwoods any good in late May? I am thinking of popping over then.
Redwoods are generally well behaved compared to other trees and their behavior is consistent throughout the year.
Does that help?
Steve