Dralowid
Michael
Has anyone got exposure tables for 'old scales'? I am going back to basics and can only remember 125th at F16 for bright sun...or maybe my memory is going ropey.
Anyway I'm after tables for 100/125/200 ASA.
The Leica I is ready, I have a lens hood and, apart from commiting part of the tables to memory, I am ready...
Michael
Anyway I'm after tables for 100/125/200 ASA.
The Leica I is ready, I have a lens hood and, apart from commiting part of the tables to memory, I am ready...
Michael
rxmd
May contain traces of nut
http://rohleder.gmxhome.de/manuals/tomsk1d.pdf is a very handy cut-out slide rule for sunny 11 and sunny 16 for any ASA number. Cut, glue, done. I've been very happy with it.
darkkavenger
Massimiliano Mortillaro
Rob-F
Likes Leicas
The value of sunny 16 lies in its simplicity. As long as it's really sunny, then at f/16, the shutter speed is the reciprocal of the film speed. Just as you said, 125th at 16 (that's for ISO 125) then for any other film speed you just put a 1 over the film speed and set the shutter. For ISO 100, the right speed is 1/100, but most cameras today have 1/125 as the closest speed. So you can accept the 1/3 stop error, or you can make the rule "1/125 at f/11 and 2/3." For ISO 200, "1/250 at f/11 and 2/3."
Mental arithmetic beats tables for this. Want a higher shutter speed? A one-stop adjustment to 1/250 at 8 and 2/3 is easy enough, but what about two stops, thinking fast? Okay, two stops: let's change from 1/125 to 1/500. What's the f/stop, quick! Just go the stop that is half the original. Don't even think about f/8 and 2/3. Let you mind skip to the next stop, the one that is half of f/11. That's f/5.6 of course (and 2/3, don't forget the 2/3).
Or else just shoot Tri-X processed in D-76 1:1 for 10 minutes. Then you can forget all that 2/3 stuff. 1/125 at 16 (equivalent to ISO 500). 1/500 at 8 (half of 16, right?). Or, 1/125 at 11 (equivalent to shooting the Tri-X at EI 250, a good thing to do). Then: 1/1000 at (mentally junp to) f/5.6. Practice your two-stop jumps in the shower or when waiting in line.
Then of course there are some rules of thumb for other conditions. Remember the Kodak instructions for "light sand or snow" "hazy sun" "overcast" and so on. I bet I have a few of those old sheets around. Want me to post some numbers?
Rob
Mental arithmetic beats tables for this. Want a higher shutter speed? A one-stop adjustment to 1/250 at 8 and 2/3 is easy enough, but what about two stops, thinking fast? Okay, two stops: let's change from 1/125 to 1/500. What's the f/stop, quick! Just go the stop that is half the original. Don't even think about f/8 and 2/3. Let you mind skip to the next stop, the one that is half of f/11. That's f/5.6 of course (and 2/3, don't forget the 2/3).
Or else just shoot Tri-X processed in D-76 1:1 for 10 minutes. Then you can forget all that 2/3 stuff. 1/125 at 16 (equivalent to ISO 500). 1/500 at 8 (half of 16, right?). Or, 1/125 at 11 (equivalent to shooting the Tri-X at EI 250, a good thing to do). Then: 1/1000 at (mentally junp to) f/5.6. Practice your two-stop jumps in the shower or when waiting in line.
Then of course there are some rules of thumb for other conditions. Remember the Kodak instructions for "light sand or snow" "hazy sun" "overcast" and so on. I bet I have a few of those old sheets around. Want me to post some numbers?
Rob
Wayne R. Scott
Half fast Leica User
Dralowid,
Look at this thread and down load the tables;
http://www.rangefinderforum.com/forums/showthread.php?p=518802#post518802
Wayne
Look at this thread and down load the tables;
http://www.rangefinderforum.com/forums/showthread.php?p=518802#post518802
Wayne