are you sure it’s not the set? ttartisan only sell their titanium lenses (17, 35 and 50mm) as a set. that would explain the big price difference. Aside from that, if you’re buying ttartisan you’re looking for a cheap lens. why do you even consider a $150 more expensive option?

I don’t want to see what photography will be like 10 years from now

you’ll need to do long exposures. also research your lenses, some let ir through unevenly across the frame (hotspots)

never had any pain, but my telephoto alone weighs more than your setup there, and many professionals will shoot for more than 3h