Support our Sponsors, they keep FADU free:   AG Photographic   The Imaging Warehouse   Process Supplies   RH Designs   Second-hand Darkroom Supplies  

Notices

Go Back   Film and Darkroom User > General discussions > Photography in general

  ***   Click here for the FADU 2015/2014 Yearbooks   ***

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 26th March 2017, 04:02 PM
kev curry's Avatar
kev curry kev curry is offline
Friend
 
Join Date: Aug 2009
Location: West coast of Scotland
Posts: 115
Default Calculating ISO 1

My spot meter only goes down to 12 ISO but i need to calculate for 1 ISO. How many stops of difference is there from 12 to 1? I can't seem to find the sequence
Reply With Quote
  #2  
Old 26th March 2017, 04:26 PM
Richard Gould Richard Gould is offline
Friend
 
Join Date: Dec 2008
Location: Jersey Channel Islands
Posts: 5,433
Default

Each step is a half of the stop so 12 to 6 is one stop 6 to 3 is one stop so 3 to 1 1/2 would be one stop so down to 1 iso would be 3 stops, same way the 6 to 12 and 12 to 24 each is one stop, Hope this make sencse
Richard
Reply With Quote
  #3  
Old 26th March 2017, 04:28 PM
Lostlabours Lostlabours is offline
Friend
 
Join Date: Apr 2012
Location: West Midlands/Aegean
Posts: 1,988
Default

A fraction over 3½ stops. 12, 6, 3 1½ then 1.

Ian
Reply With Quote
  #4  
Old 26th March 2017, 05:03 PM
kev curry's Avatar
kev curry kev curry is offline
Friend
 
Join Date: Aug 2009
Location: West coast of Scotland
Posts: 115
Default

Smashing - thanks!
Reply With Quote
  #5  
Old 26th March 2017, 06:17 PM
alexmuir alexmuir is offline
Friend
 
Join Date: Jan 2010
Location: Glasgow, Scotland.
Posts: 2,668
Default

If you can read 16 from your meter, then it would be 4 full stops.
Alex
Reply With Quote
  #6  
Old 26th March 2017, 06:48 PM
Lostlabours Lostlabours is offline
Friend
 
Join Date: Apr 2012
Location: West Midlands/Aegean
Posts: 1,988
Default

misread

Last edited by Lostlabours; 26th March 2017 at 07:00 PM.
Reply With Quote
  #7  
Old 26th March 2017, 07:12 PM
kev curry's Avatar
kev curry kev curry is offline
Friend
 
Join Date: Aug 2009
Location: West coast of Scotland
Posts: 115
Default

thanks Alex
Reply With Quote
  #8  
Old 26th March 2017, 09:46 PM
Maris's Avatar
Maris Maris is offline
Friend
 
Join Date: Jul 2009
Location: Noosa, Australia
Posts: 183
Default

I've used a lot of photographic materials that have sensitivity values well below what light-meter dials were designed to accommodate. The easy way out of the problem for me is to set an ISO value that is 100 or 1000 times greater than actual speed. For example with ISO = 1 I'd set 100 and then just multiply the shutter speed suggested by the meter by 100: 1/60 sec suggested, 1.6 sec given; 1 sec suggested, 1min 40sec + reciprocity correction given; and so on ....
__________________
The word Photography first uttered and defined by its author Sir John Herschel at Somerset House, London on the evening of March 14, 1839: quote "Photography or the application of the Chemical rays of light to the purpose of pictorial representation" unquote.
Reply With Quote
  #9  
Old 27th March 2017, 06:28 AM
kev curry's Avatar
kev curry kev curry is offline
Friend
 
Join Date: Aug 2009
Location: West coast of Scotland
Posts: 115
Default

Great idea Maris - thanks!
Reply With Quote
Reply
Support our Sponsors, they keep FADU free:   AG Photographic   The Imaging Warehouse   Process Supplies   RH Designs   Second-hand Darkroom Supplies  

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Print processing - calculating time vs temperature EdmundH Monochrome printing techniques 19 13th July 2016 01:49 PM
Calculating New Exposure Time for An Enlargement Mike O'Pray Darkroom 10 4th January 2010 08:22 AM
Calculating the Hyperfocal Distance Barry Photography in general 2 8th September 2009 08:01 PM
Calculating exposure using extention tubes Larry Cameras - medium format 5 5th July 2009 12:23 PM


All times are GMT. The time now is 06:01 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.