2 sd cards died in about 15 years. Used like 20 different ones. One card died completely, second switched to read only state, but wrongly reported by other hw. It seems, like data beeing written, but they are not and only older data are there. Yeah, second slot saves lives.
Z 50mm f/1.2
Correct, I will just add few words. High speed sync uses more battery and is usually not that powerful. Some use them in opposite way, instead of nd filters, so in very sunny day, trying to get portrait with f/1.8 with 1/4000s. For halloween party I would not go for this settings, I would probably want to have some ambient lights involved, but froze the action with non hss. What is freezing the action is not the shutter speed. That works for continuous, ambient light. What freezes action is duration of the flash beeing burned. And these times are usually much much shorter, than sync speed, also depends on power of the flash. Full power burns usually longer, than 1/4 power. It may be 1/1000s vs 1/8000s. So. Turn off the flash first, expose for ambient light first. Then turn flash on and play with flash power. Now shutter speed and aputure will affect ambient light, aputure will also affect flash, but shutter speed will NOT affect flash. Have fun :)
As I don’t like the idea for great photos and finding the one you actually like for composition, pose, smiles, etc… but it could be handy to quickly find the sharpest / blurrest ones. Going throug few thousands of photos from wedding could be a little bit faster. Filter out the bad ones, quickly check the selection, flag them and focus more on the sharp ones.