@Billthoo thanks!

nah, too long even with 400 in full sun. I packed one of those tiny “ultra pod” type folding tripods that can also be strapped to things. A good match for the ultralight holga. So this was from ground level with me kneeling next to it (holding the filters in place!) with a cable release and 3-4 sec exposures. Hard to see the window to advance the film, though!