mccamy@squirt.DEC (01/29/85)
From: "...decvax!decwrl!rhea!Squirt!McCamy"
Merrimack, New Hampshire
For the person lacking an ASA speed of 1000 on their Pentax:
Usually there is a click stop in-between 800 and 1600 (closer to 800) that
corresponds to ASA 1000. If your camera does not have a click stop at that
location, then you can set the ASA at 800 and follow these instructions:
o I cannot give you specifics on how to set up your camera, because
I don't know if your camera has the "shutter priority" or "aperture
priority" automatic system. But, the idea is to set up the shutter
speed and aperture based on the ASA of 800, and then close the
aperture 1/2 f-stop. The ASA 800 is so close to ASA 1000 that it
is possible that you may get very good results without having to
change the f-stop.
o The basic theory of my suggestion is this: By setting your camera
to an ASA of 800, you're telling your camera that you are shooting a
film that is less sensitive than ASA 1000. The camera will then
provide the film with more light than it would if the ASA were set
to 1000. You don't want the camera to expose the film with more
light, so you compensate by closing the aperture by 1/2.
o You can "bracket shoot", meaning, you can take two or three pictures
of the same scene at different camera settings. That will usually
assure you of getting a correctly exposed picture. This will also
enable you to determine the ideal camera settings you will use on
future rolls of ASA 1000 film.
o Just for the record, the American Standards Association (ASA)
designation has been replaced by the International Standards
Organization designation (ISO).
Good luck with your camera! 1000 film is a lot of fun to use!