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I have a Sunpak PF30x on a Nikon D40. When I take pictures with the Sunpak flash, I notice the image data has "Optional-TTL" as the flash mode.

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    Did the flash fire? – John Cavan Nov 7 '10 at 3:22
  • Yes the flash did fire. – Brig Nov 16 '10 at 16:11
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Optional-TTL means you're using an accessory flash instead of the built in flash, but still using the through the lens metering to control it.

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Maybe because of how your model is setup?

This flash unit supports flash exposure compensation which allows you to adjust output independently of the i-TTL.

Disclaimer: I don't have one of these units. Just what I noticed from a simple websearch about this product.

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