Meter scales are different?

[Pawlowski6132]

At ISO 400 and EV 9, at f8, my Pentax digital spot gives 1/30 exposure. My sekonic twinmate gives 1/8. Why would these be different?..

Am I missing something?.

I'm pretty sure the sekonic scale is right but they should be equal.

[ic-racer]

EV value on the Pentax is always referenced to ISO/ASA 100 (oddball quirk with that lightmeter). Look in the manual under "Special Features" number 10.

Set the Sekonic to 100 and see if they now match.

[Pawlowski6132]

EV value on the Pentax is always referenced to ISO/ASA 100 (oddball quirk with that lightmeter). Look in the manual under "Special Features" number 10.

Set the Sekonic to 100 and see if they now match.

Thanx for the reply. But my Pentax has an adjustable ISO.

[Pawlowski6132]

https://www.icloud.com/photostream/#AAJRveFpF7VJH

[Pawlowski6132]

This table tells me Pentax scale is correct?

http://en.m.wikibooks.org/wiki/Basic...xposure_tables

[ic-racer]

Thanx for the reply. But my Pentax has an adjustable ISO.

Yes and in spite where the ISO is set, the EV is always referenced to ISO 100.

[Bill Burk]

Yet this table shows the Sekonic Twin-Mate is correct.

I'm afraid we have a case where the same two letters of an abbreviation for the same two words are used for two completely different purposes.

Quite an interesting mess the light meter people have given us isn't it?

http://en.wikipedia.org/wiki/Exposure_value

[Bill Burk]

ic-racer, are they only the same at EI 100?

[Pawlowski6132]

Yes and in spite where the ISO is set, the EV is always referenced to ISO 100.

That shouldn't matter in this case. The scales should match and they don't.

Right?

[Bill Burk]

Pawlowski6132,

I guess you figured something out? It looks to me like the Pentax scale should be labeled EV@EI=100 because that's what the numbers are.