To drive your vintage 15″ Apple Studio Display (ADC) from your 2018 Intel MacBook Pro, you’ll would actually need two adapters:
ADC ➟ DVI Adapter
AFAIK, the only adapters that actually convert the ADC plug (which carries video, USB, and power) to a standard DVI signal + external power are the genuine Apple version or a Gefen box:
- Apple M8661LL/B (A1006) – the official Apple DVI → ADC active adapter, complete with power supply. These pop up on eBay or vintage Mac parts sites between ~$40–90 USD
- Gefen EXT‑DVI2ADC (or ADA‑ADC‑2‑DVI) – a standalone DVI-to-ADC conversion box.Note: some buyers report it only works on ADC LCDs, not CRTs
Either of these will take your Mac’s video and USB (plus external power) to drive the studio display.
USB‑C (Thunderbolt 3) ➟ DVI
Since your 2018 Mac outputs via USB‑C/Thunderbolt, get a straightforward USB‑C ➟ DVI adapter. Here are some to consider:
- TeciSoft Plugable USB-C to DVI Adapter
- StarTech.com USB‑C to DVI Adapter
- SifoSolutions USB‑C to DVI Adapter
Unfortunately, I don't have either of these devices, so I can't verify that any of these adapter will work. As such, I strongly suggest that you review the source site's return policies should they do not work.