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mattdm
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What are the differences between E-TTL, i-TTL, and P-TTL?

Canon, Nikon and Pentax each have their own TTL flash metering systems, respectively E-TTL, i-TTL, and P-TTL work. As far as I know, theyThey all use a weak preflash that is metered and used to calculate flash power level required for correct exposure, but I suspect there might be differences in implementation details.

What are the nuances by which the modern TTL systems differ, and in which situations do strengths/weaknesses and weaknesses of these metering algorithms show?

I already know that each system is brand-specific and uses different hot-shoe contacts, so no need to mention that.

What are the differences between E-TTL, i-TTL and P-TTL?

Canon, Nikon and Pentax each have their own TTL flash metering systems, respectively E-TTL, i-TTL and P-TTL work. As far as I know, they all use a weak preflash that is metered and used to calculate flash power level required for correct exposure, but I suspect there might be differences in implementation details.

What are the nuances by which the modern TTL systems differ, and in which situations do strengths/weaknesses of these metering algorithms show?

I already know that each system is brand-specific and uses different hot-shoe contacts, so no need to mention that.

What are the differences between E-TTL, i-TTL, and P-TTL?

Canon, Nikon and Pentax each have their own TTL flash metering systems, respectively E-TTL, i-TTL, and P-TTL. They all use a weak preflash that is metered and used to calculate flash power level required for correct exposure, but I suspect there might be differences in implementation details.

What are the nuances by which the modern TTL systems differ, and in which situations do strengths and weaknesses of these metering algorithms show?

I already know that each system is brand-specific and uses different hot-shoe contacts, so no need to mention that.

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Imre
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What are the differences between E-TTL, i-TTL and P-TTL?

Canon, Nikon and Pentax each have their own TTL flash metering systems, respectively E-TTL, i-TTL and P-TTL work. As far as I know, they all use a weak preflash that is metered and used to calculate flash power level required for correct exposure, but I suspect there might be differences in implementation details.

What are the nuances by which the modern TTL systems differ, and in which situations do strengths/weaknesses of these metering algorithms show?

I already know that each system is brand-specific and uses different hot-shoe contacts, so no need to mention that.