 BetterPhoto Member |
F-Stops and Apeture settings Hi used to when I had my Yashica TL-Electro and bought film it was rated in ASA now the film is rated in like 400 speed For example I have been shooting Fujicolor Superia 400. What is the relation between this 400 and ASA that I used to use? Also there used to be a chart in each roll of film that gave me ideas about settings for Outdoors, Sunny and cloudy I used to remember 250 for Bright light and I think I would use an apeture setting of 8 or 11. I now have a Mamiya 1000 DTL I bought used because it uses screw-in lenses like my Yashica that I loved did. Is there any place to go to get a guide on F-stops, Appeture, film speed settings and so forth. I remembered inside I used a 60 and a 5.6 with a flash. Any help appreciated. Would even like a booklet that would speak about this. The light meter in the Mamiya is not working.\ Dr. Mike Hughes, D.Min.
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John A. Lind |
Mike, The "400" is the ISO film speed rating. For all practical purposes this is the same as the older ASA rating. ISO = International Standards Organization. ASA = American Standards Association. The exact lab method to measure a film's speed is slightly different for an ISO speed rating than what was used for the ASA speed rating, but the end results are very nearly identical. For an exposure guide, look for Kodak's "Pocket Photoguide" (Kodak Publication No. AR-21). You should be able to find it in any large camera store. The former title (many years ago) was "Master Photoguide." The current one I've seen has a white cover with the title and lens aperture blades in dark blue/green. Size is 4x5 inches, wire spiral bound, and it's just over 1/4 inch thick. This guide has a "Daylight Exposure Dial" for estimating exposure based on film speed. It provides the same information as was found on the data sheets that used to be included with film (Kodak still prints this on the inside of the box). There are a number of other useful sections including estimating existing light exposures for indoors and at night, filter data, etc. -- John
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