Ring made to adapt an addon lens to go as low as 66 micron

Hi,

here is a shared object to ehance a bit the G3D T1000 DLP resin printer
use mainly in 100 micron mode to lower it at 66. warning it make a small barrel distortion. mainly on the outside (i will use a software compensation for the slices i think in future)

the insulation size goes as low as 100x76 (/1.50) 66x50 mm but in 66 microns
i used an aliexpress cheap lens here:
https://www.aliexpress.com/item/2015-New-Arrival-BIg-Glass-lens-77mm-led-optical-lens-reflectors-fixed-ring-for-20