Hello! I've been following this thread ever since i got the new Seafrogs A6xxx housing and got great tips from the group. so thank you, all. so in return, please allow me to share what I've done with my set up so far and hope this could also help others. and maybe get additional tips for improvement as well
First off, finding a lanyard that would fit the Meikon tray proved to be challenging for me. so what i did instead was to buy paracord and braided it, attached a small stainless shackle and looped it around the base of the ball mount. 6 months after, no complaints.
2nd, to those curious if a shutter release trigger would work on the Meikon tray and Seafrogs housing set up, the answer is Yes. though it will require a few tweaking. see photo below.
3rd, I wanted to do macro shots but the short port with 67mm thread and macro lens/diopter is quite beyond my budget right now. so what i did was to use the 16-50mm kit lens and added an extension tube (the 16mm to be exact) using the standard port that came with the housing. ( i bought the housing during the time when all other ports was still on the drawing boards). a little DIY to extend the focusing ring and, voila. It fitted the standard port just fine. i'm pretty satisfied with the photo results. only downside of it is, you can only shoot in macro all throughout the dive.
lastly, i bought a 7artisans manual fisheye lens and followed Barmaglot's advice on the DIY focusing ring. used it with the 4 inch dome and setting the camera to 16:9 aspect ratio to remove the vignette. question though to those using this set up, are you satisfied with the sharpness and clarity of the 7artisans underwater? i'm having a hard time getting good focus. or maybe this is just the drawback of using manual lens for underwater photography?
here's a photo of the lanyard and shutter release trigger
sample photo using 16-50mm kitlens plus extension tubes on standard port
sample photo using 7artisans fisheye on 4" dome port
cheers,