Ok,
Now, I've had a Minolta Spotmeter F for the last 10 years or so, and I have neve r really worked in EV, I always used the f-number and aperture output informatio n from the meter. However, I am aware that the EV is a relationship with variab les associated with the ASA and light level of the scene being metered.
For example, the meter might say EV 10 when set to ASA 100, and with the same re ading, it will shift to say EV 12 when set to ASA 400.
That's all fine and good, until... I just purchased a Pentax digital spotmeter. The two meters agree at ASA 100, but, wheras the Minolta will 'shift' the EV as the ASA gets adjusted, the Pentax EV reading remains the same regardless of the ASA.
Did I have an incorrect assumption about how the EV scale works? I always assum ed the EV was based on some kind of ANSI or other standard, and that all meters would agree. It appears to me that EV is somewhat arbitrary in use, and that th e the information (EV number) is only relevant for the particular meter that is being used.
One note, even though they display different EV numbers, they agree on the shutt er speed and aperture combinations to make a proper exposure.
Any thoughts?
---Michael
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