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<blockquote data-quote="WayneF" data-source="post: 217021" data-attributes="member: 12496">I agree, the green circle does look like a sensor.&nbsp; Or maybe a logo?&nbsp; And thyristor is control, for TTL, but manual&nbsp; also needs a menu for humans to enter their goals.&nbsp; Most flashes, esp of that era, did also have a non-TTL Auto mode, where the flash body itself monitors light (via such a front sensor), light reflected by from its flash, and quenches the thyristor off when sufficient.&nbsp; This also means it needs to obtain camera ISO and f'/stop to know what is sufficient, either from hot shoe communication, or manual entry&nbsp; in a menu.&nbsp; And that could still work that way today (with manual entry of ISO and f/stop), but this user manual makes no mention of it.Reconsidering, I may be wrong about no manual mode.&nbsp; I realize now that the slide switch at left appears to select A (auto) or M (manual), on next to last page.&nbsp; &nbsp; However, it shows no menu to set manual flash power.&nbsp; Instead it appears to use guide number information (f/stop and distance).&nbsp; It appears to tell you which f/stop to use, but I don't how you tell it distance?&nbsp;&nbsp; Which maybe could be made to work, but anyone reasonable surely wants a more modern flash. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" /></blockquote>

[QUOTE="WayneF, post: 217021, member: 12496"] I agree, the green circle does look like a sensor. Or maybe a logo? And thyristor is control, for TTL, but manual also needs a menu for humans to enter their goals. Most flashes, esp of that era, did also have a non-TTL Auto mode, where the flash body itself monitors light (via such a front sensor), light reflected by from its flash, and quenches the thyristor off when sufficient. This also means it needs to obtain camera ISO and f'/stop to know what is sufficient, either from hot shoe communication, or manual entry in a menu. And that could still work that way today (with manual entry of ISO and f/stop), but this user manual makes no mention of it. Reconsidering, I may be wrong about no manual mode. I realize now that the slide switch at left appears to select A (auto) or M (manual), on next to last page. However, it shows no menu to set manual flash power. Instead it appears to use guide number information (f/stop and distance). It appears to tell you which f/stop to use, but I don't how you tell it distance? Which maybe could be made to work, but anyone reasonable surely wants a more modern flash. :) [/QUOTE]

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