Going from 125 to 250 is a one stop change, so if you want to shoot ISO 100 at f11, bump the shutter up to 1/250. If you think of the shutter and aperture stops as interchangeable, you can just swap one for the other. So for every stop you open up the aperture, set the shutter one stop faster, and vice versa.
Hope this helps! - MCC At 07:53 AM 12/4/01 -0500, you wrote: >Using this assumtion,between shutters speeds are we looking >at about a 1-2 stop change.By that i mean going from 1/125 to 1/250 >ISO 100 base,is there a stop difference of 2?I should knowe this >but...... > >Dave(picking up non metering equip. soon)Brooks >---- Begin Original Message ---- > From: Mark Cassino <[EMAIL PROTECTED]> >Sent: Mon, 03 Dec 2001 21:56:40 -0500 >To: [EMAIL PROTECTED] >Subject: Re: Sunny 16 rule > >On a clear sunny day, set the aperture to f16 and the shutter speed to the >inverse of the film speed (e.g. 1/100 (or 1/125) for ISO 100, 1/200 (or >1/250) for ISO 200, etc). Of course, you can elaborate from there - f 8 >and 1/500 for ISO 100 film for example. > >You probably should use print film for this, since it is more forgiving in >exposure than slide film. > >Good luck! > >- MCC > >At 06:45 PM 12/3/01 -0800, you wrote: > >Sorry to be a bore, > >But can someone explain the Sunny 16th rule for me, as I am not going to > >have my SPF meter repaired. I also want to use my newly acquired S1a, so I > >need to practice exposures without the aid of a meter. I will eventually > >buy one, but not now. > >Regards > >James > >- > >This message is from the Pentax-Discuss Mail List. To unsubscribe, > >go to http://www.pdml.net and follow the directions. Don't forget to > >visit the Pentax Users' Gallery at http://pug.komkon.org . > >- - - - - - - - - - >Mark Cassino >Kalamazoo, MI >[EMAIL PROTECTED] >- - - - - - - - - - >Photos: >http://www.markcassino.com >- - - - - - - - - - >- >This message is from the Pentax-Discuss Mail List. To unsubscribe, >go to http://www.pdml.net and follow the directions. Don't forget to >visit the Pentax Users' Gallery at http://pug.komkon.org . > > >---- End Original Message ---- > > > >Pentax User >Stouffville Ontario Canada > >Sign up today for your Free E-mail at: http://www.canoe.ca/CanoeMail >- >This message is from the Pentax-Discuss Mail List. To unsubscribe, >go to http://www.pdml.net and follow the directions. Don't forget to >visit the Pentax Users' Gallery at http://pug.komkon.org . - - - - - - - - - - Mark Cassino Kalamazoo, MI [EMAIL PROTECTED] - - - - - - - - - - Photos: http://www.markcassino.com - - - - - - - - - - - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
