It would change your exposure. Your camera calculates the correct exposure
(aperture and/or shutter speed) based on the light reading and the film
speed. By using an ASA number lower than the film's actual speed, you would
be overexposing, and using higher numbers than the film would cause your
pictures to be underexposed. Print film can generally be over/underexposed a
stop or even two without a huge impact because of the film's latitude and
the automatic correction done when the lab prints it; slide film is much
less forgiving.
There are varying opinions, but many photographers routinely overexpose
("pull") some films by half a stop or more because they feel it improves
detail or stauration or contrast. An example might be shooting an ASA 200
slide film at 160, or an ASA 100 film at 80 or even 64.
Conversely, the term "pushing" refers to intentional underexposure to
achieve a higher than rated film speed, for example "pushing" 800 film to
1600 or 3200, and then changing the film development time to compensate.
This can be done on the camera by changing the ASA as you've suggested or
using Exposure Compensation.
tomp
----- Original Message -----
From: "Jason Lay" <[EMAIL PROTECTED]>
To: "EOS" <[EMAIL PROTECTED]>
Sent: Friday, January 19, 2001 9:58 PM
Subject: EOS film speeds
> I own the Elan II...my question is this...When I insert the film the ISO
> speed is automatically detected...what would happen if I were to manually
> adjust the ISO settings on the camera to slower or faster film
speeds...for
> example...if I put in say ISO 800 filam, and changed the ISO settings to
> 200, or maybe 1000, or go up as high as 4000...what exactly would this do
to
> the pictures I would take...thanks for the help... :-)
>
>
*
****
*******
***********************************************************
* For list instructions, including unsubscribe, see:
* http://www.a1.nl/phomepag/markerink/eos_list.htm
***********************************************************
