Good tips.
I'm using two projectors, normally with a hard cut or sometimes a very quick dissolve. I do around 4 seconds per slide with 10-20 slides tops, on auto with the presentation on a loop. That means the entire show is over in a minute or so, about the attention span of my friends and family used to scrolling screens. Photos of family and friends gain more attention than photos of mountains or flowers. I've found dissolving two slides of the same scene but with different focus points is a neat trick but it gets old quick.
Two projectors just seems like vast overkill.
It gets ludicrously cumbersome to have the whole setup sitting around, or dragging it out every time.
And you have to part your show over two slide trays/carousels.
Cross-dissolve is a nice trick for a very professional looking show.
If you are pitching a new campaign to a board in 1985, or have your show at a fair or museum, it might lend a certain extra something to your presentation.
But for private use, it just telegraphs “too much”.
I’m writing this not so much to tell you what to do or not to do.
But more to dissuade others from pursuing the idea actively.
If a two projector setup drops in your lab you’d of course try it.
But I wouldn’t suggest making it a priority.
Actually one of my most successful “shows” was with a tiny, crappy Leitz seesaw projector, that takes one slide at a time.
And it was just a spur of the moment where I wanted to show one or two slides quickly, and we ended seeing a whole stack for thirty minutes.
No pressure to sit through a program, and no big 20kg projector with a fan.