Vello Hot Shoe Adapter with PC Socket for Sony Multi-Interface Shoe

Yes you can connect it to the pc port

Would supposedly work since this pc male output passes the signal outward. However, my Sony A3000 could not even trigger or fire my Neewer flash when attached onto the hot shoe socket. Otherwise, if it can fire the flash in the hot shoe, should be able to output a signal thru the male pc sync socket. Other users have commented that it sometimes one or the other meaning that both flash in the hotshoe or using the pc sync socket will not work simultaneously.

Sure, check out the Vello HSA-CCS https://www.bhphotovideo.com/c/product/765449-REG/Vello_HSA_CCS_Hot_Shoe_Adapter_to.html

We are not aware of this working with the HDR-XR-502V camcorder.

Yes, the Vello Hot Shoe Adapter with PC Socket for Sony Multi-Interface Shoe would allow for a Godox TT685N for Nikon to fit a Sony A7 III.

I just tried it on my Sony A7IV and it did not work. Could not trigger my Dynalite pack. Also tried another brand, and it also did not work. I've read that the hot shoe on the sony A7IV is slightly different/smaller than previous Sony Cameras. I'm searching for a solution on how to use my A7IV with a wired connection to my Dynalite strobe pack.

Yes, the Profoto Air Remote TTL-C for Canon will work with the Vello Hot Shoe Adapter with PC Socket for Sony Multi-Interface Shoe on the Sony a7R III Mirrorless Camera in manual flash mode without TTL.

The Vello Hot Shoe Adapter with PC Socket for Sony Multi-Interface Shoe will not work with the Yongnuo YN560-TX II Manual Flash Controller for Nikon or Canon. And sync in rear curtain with the Sony A7IV.