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  1. I recently upgraded my old Canon 7D setup to a Canon R5. I really enjoy using the new camera and the Nauticam housing, but I have problems with my two Inon z240 type 4 strobes. With my Canon 7D, I used the internal pop-up flash and fiber optic cables to trigger the strobes. I mostly used TTL, which I found worked very well with this setup and just dealing in the +/- exposure on the strobes. I use inon fiber optic cables. Since TTL worked quite well for me with the 7D, I thought it would be nice to still have that option with my new R5 setup, so I bought a Nauticam TTL flash trigger for Canon to trigger the strobes, But when I try shooting anything in TTL mode with the R5, I’m getting pretty underexposed images. The z240s are set to STTL, and the other dial to B (also tried increasing the strobe power by turning it counter clockwise) . The pre-flash button is in the out position. (I also tried the in position by that underexposes even more). It’s about 2-3 stops underexposed if using f16, but if I switch to f2.8, then they look somewhat better. Anyway, I got a little tired of fiddling around in the TTL mode, so I decided to try out using manual mode instead for the strobes. That sort of works, up to about 25% power (right dial between 11 and 8). If I move it to 11 (50% power), or set the flash to full then I get basically no flash output. (pre-flash button is in the in position). I tried the strobes again on my 7D and they are able to fire at high output in TTL mode, so the flash part is working fine. I googled around for this problem and found several old post describing corroded magnets in the pre-flash switch, which seem to precisely describe my problem in manual mode. (I can also mention that full dumb does actually not work on the 7D, I just never discovered until now). The strobes are 8 and 6 years old. https://wetpixel.com/forums/index.php?/topic/48381-misbehaving-inon-strobe/ https://wetpixel.com/forums/index.php?/topic/43696-z240-manual-problem/ So I have a couple of questions: Is there a TTL trigger that works well with the R5 and z240 strobes? Or does anybody have any suggestions on how to get the Nauticam one to work properly? Second question: If I bought a manual only flash trigger, would that allow my z240s to work properly in manual mode without the fix for the magnets? I could also try to fix the strobes, but I’m not exactly sure how to. I’m afraid of opening up the button and then not being able to close it properly again and then having no working strobes. I have tried sending the links to the forum posts to the shop where I bought the Inons, to see if they could fix them, but that didn’t seem like the case. Lastly, I could also buy new strobes, but I would rather not spend the money of those at the moment, if I can get the Inons to work again. Thanks in advance if anybody can offer any advice or insights
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