Mailinglist Archives:
Infrared
Panorama
Photo-3D
Tech-3D
Sell-3D
MF3D

Notice
This mailinglist archive is frozen since May 2001, i.e. it will stay online but will not be updated.
<-- Date Index --> <-- Thread Index --> [Author Index]

Re: rodinal developer for infrared

  • From: George L Smyth <GLSmyth@xxxxxxx>
  • Subject: Re: rodinal developer for infrared
  • Date: Fri, 13 Sep 1996 20:04:20 -0400
J. Wayde Allen 303-497-5871 wrote:
> 
> Film speed goes in 1/3 stop increments as I recall.  So a 1 stop change
> in exposure is equivalent to changing the film speed (ISO) by a factor of
> three.  Now I'll have to check to be sure.

I believe you're thinking about how many cameras deal with aperture
settings.  They allow you to alter the aperture by 1/3 stop increments.

No, one stop will double or halve the EI.  For instance, if you are set
at EI100 and open up one stop, you are now set for EI50.  Conversely,
stop down one stop and you're set for EI200.

george

-- 
 Handmade Photographic Images     
  http://www2.ari.net/glsmyth

------------------------------

Topic No. 23