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Sea & Sea has several different TTL converter models and you may have to test a couple yourself.
If it works, TTL will be fairly convenient for macro.
The DTTL will not work with the D100 / Z240 combo.
It also looks like Jean has given you lots of good advice.
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In your old system you had a Nikon strobe in a housing that talked directly to the Nikon camera. That's why TTL worked. Unfortunately, Nikon (and Canon) will not tell other strobe companies exactly how DTTL works so guys like Matthias at Heinrichs-Weikamp essentially reverse engineered the protocol and built a small circuit board that translates the Nikon signals into signals that the strobes can understand. I believe that the Sea and Sea converters essentially use H-W converter circuits but packaged in an external device. H-W converters are labeled as compatible. I use an H-W converter to trigger Z240 strobes so all should be good if you go that route. It is not clear from Sea and Sea if their TTL converter N will work with the D100. They suggest that it will for the D200 and later but I can't find anyone who knows, so if you buy the TTL converter from S&S make sure you can send it back if it doesn't work.
Bill Van Antwerp Canon/Nauticam/Subal/Inon Lots of glass
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No, sorry. The D100 will not work with our iTTL converters at all. It uses a DTTL system we do not have a converter for.
Looks like I will be shooting in manual mode until I upgrade to a Nikon camera that does iTTL i.e. D200 or later.
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