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I am also trying to use a Sony A7IV with the ASIAir Plus Module/App. But it simply does not work. ZWO I believe is working on this but the ASIAIR App does not recognize that the Sony A7IV is in Bulb Mode. The work around is to set your camera to 30 sec exposure instead of BULB mode. You can take 30 sec exposures through the app, but thats all. Hopefully next update fixes this as I have also had a frustrating time. Keep checking back here, many other Sony A7IV users are having the same problem.