Weston ratings a.s.a exposure meter exposures . Available to purchase for immediate download. Below is an extract from the manual converted to text for a quick impression on the content. Weston ratings a.s.a exposure meter exposuresWESTON RATINGSFOR WESTON MASTER v. MASTER IV. MASTER III UNIVERSAL AND ALL CINE MODELS use the ASA ratings given on the following pages. If the film you are using is not shown. use the rating recommended by the film manufacturer. Or-cine models only-if the required value does not appear on the calculator dial, use of the next lower rating is recommended. Ensure that the ASA or DIN rating is set in the appropriate window of your Master V. FOR WESTON MASTER ll UNIVERSAL AND FOR EARLIER UNIVERSAL MODELS use the next lower rating on your meter in preference to the one shown in this booklet. If the film you are using is not shown. use the next lower rating to the 8.8. or A.S.A. arithmetical index recommended by the manufacturer. c A U TI O N When using a particular type of film for the first time. it is advisable to confirm that the correct Weston Rating has been used before exposing a large quantity. Equipment errors can lead to under or over exposure and the listed Weston Rating should be lowered if results are under exposed or raised if over exposed.