Pentax 30465 Operation Manual - Page 18
wide-angle
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LINIDE-ANGLE/TELEPHOTOLENSADAPTORS HOWTOATTACHTHEADAPTORS Slide either adaptor into the slots at the top and bottom of the flash head, making sure to push it all the way in until it is centered over the flash head. 18 WIDE-ANGLAEDAPTOR( AFW1) Designed principally for ultra-wide-angle lenses down to 24mm, this adaptor also offers improved results with 28mm and 30mm lenses. Auto Flash: When the wide-angle adaptor is employed maximum auto flash range is reduced to 5 meters (16.4 ft.) at the RED auto setting and 2.5 meters (8.2 ft.) at the GREEN auto setting. Index the ASA film speed as for normal auto exposures, but use the respective "W" index line of both RED and GREEN auto modes to determine the f-number. Manual Flash: To compensate for manual f exposures with the wide-angle adaptor index, halve the ASA film speed on the ASA film speed index on the flash unit's control panel (if you are using ASA 100 film, for example, align the number 50 with the white index line). Then, choose the f-number opposite the subject distance in the same manner as with manual flash when the adaptor is not used.