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01-24-2015, 12:38 PM   #1
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Question on Spotmatic Speed Ring / ASA Indicator

On the ASA indicator on the Spotmatic there are a series of numbers which tells you what ASA the camera is set for. Some of the indicator "dots" have accompanying numbers (like 200, 400, 800, etc.) and some "dots" on that ring have no number.

So, I want to shoot ASA 50 transparency film, but there is no labeled indicator for ASA 50...only a "dot" between ASA32 and ASA 64. Can I reasonably assume that the unlabeled dot could be ASA 50 setting (or close enough not to materially affect the shot)?

01-24-2015, 01:53 PM   #2
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The ASA/ISO dial is in 1/3rd stop increments. ASA 50 is on full stop slower than ASA 100 so if you count down three click stops from 100 it will be set at 50. Which happens to be 1/3rd stop below 64.

The Spotmatic F manual shows all the film speeds, password is "Pentax"
http://www.pentax-manuals.com/manuals/m42/pentax_spotmaticf_manual_s.pdf
01-24-2015, 02:21 PM   #3
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QuoteOriginally posted by Not a Number Quote
The ASA/ISO dial is in 1/3rd stop increments. ASA 50 is on full stop slower than ASA 100 so if you count down three click stops from 100 it will be set at 50. Which happens to be 1/3rd stop below 64.

The Spotmatic F manual shows all the film speeds, password is "Pentax"
http://www.pentax-manuals.com/manuals/m42/pentax_spotmaticf_manual_s.pdf
Thanks very much. Got it.
01-25-2015, 08:20 PM   #4
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That would be correct!

QuoteOriginally posted by Flylooper Quote
On the ASA indicator on the Spotmatic there are a series of numbers which tells you what ASA the camera is set for. Some of the indicator "dots" have accompanying numbers (like 200, 400, 800, etc.) and some "dots" on that ring have no number.

So, I want to shoot ASA 50 transparency film, but there is no labeled indicator for ASA 50...only a "dot" between ASA32 and ASA 64. Can I reasonably assume that the unlabeled dot could be ASA 50 setting (or close enough not to materially affect the shot)?


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