Prefocus cap (Q29978)
From CanonBase
A technology for electric lamps to ensure the filament is always positioned in the correct place in the optical system. Before the prefocus cap, the position of the lamp had to be manually adjusted.
| Language | Label | Description | Also known as |
|---|---|---|---|
| English | Prefocus cap | A technology for electric lamps to ensure the filament is always positioned in the correct place in the optical system. Before the prefocus cap, the position of the lamp had to be manually adjusted. |