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Anyone ever have any problems with the TSA and their DS 160 batteries in carry-on luggage?

I am new to photography so please bear with me. I just cracked my Olympus housing and got an Ikelite to replace it. I thought this would also be a good time to move up to dual strobes and replace my single Sea and Sea 110a with dual Ikelite DS 125’s. This way I can use the sync cord connected to my hotshoe instead of the fiber optic I used with the Olympus housing. Can someone give me an idea what I should pay for the 125’s? Their used price seems to be all over the place and I can’t determine what is fair. I also see some of them have had upgrades by Ikelite such as a current listed one states it has the modeling light and the latest eTTL specs.

Has anyone had problems with the TSA and their carry-on camera rig? I have a couple 12" aluminum strobe arms and a large aluminum tray for my rig.  I was just wondering if I should put the tray and arms in my checked gear.

I need help finding the correct fiber optic cable. I have a YS-110a strobe that I will be connecting to an AD Mount base with a flash block. One end of the cable will need the connector that plugs into the strobe and the other shouldn’t have a connector. The end is slightly striped and pushed through a small bushing. All of the cables I find have two connectors on them and I have no idea if or how the cable can be cut.

I am trying to understand the difference and the advantages / disadvantages of using an electrical sync cord over a fiber optic cable on a point and shoot camera.  The camera housing is an Olympus PT-030.  It has an Inon bayonet mount where the fiber optic cable just pushes through a bushing in front of the onboard camera flash or I could get  a Heinrichs – Weikamp replacement bulkhead .  I will be attaching a S&S YS-110a.  If I use the sync cord and the Heinrichs – Weikamp replacement bulkhead will I get somewhat of an auto exposure with it for macro shots?  With the fiber optic cable will my only option be to manually adjust the power settings to control the flash intensity?  Sorry, I am really new at this and the articles I read just confused me further I think.