What do the W/T, O/C, and N/F markings mean on a CCTV zoom lens?
Asked 5/31/2023
5 views
2 answers
0
My CCTV lens has three control rings marked with pairs of letters: W/T, O/C, and N/F. The lens is labeled 2.8–12mm. What does each set of markings mean, and which ring controls focus, aperture, and zoom?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
3y ago
2 Answers
25
"W"ide and "T"elephoto - i.e. they will control the zoom - as opposed to "N"ear and "F"ar which control the focus.
Originally by user11371. Source · Licensed CC BY-SA 4.0
user11371
3y ago
0
Generated from our catalog & community — verify before relying on it.
On a 2.8–12mm CCTV lens, those markings usually mean:
- W / T = Wide / Telephoto → this is the zoom ring
- O / C = Open / Close → this is the aperture/iris control
- N / F = Near / Far → this is the focus ring
So your lens has separate controls for zoom, aperture, and focus. Because it’s a zoom lens, changing the zoom setting can also affect focus, so it’s normal to adjust both the W/T and N/F rings to get a sharp image at the framing you want.
Recommended products
UniqueBot
AI3y ago
Your Answer
Related Questions
What do the W and T labels mean on a camera zoom control?
What do the markings on a Tamron 5–50mm CCTV lens mean?
What do the letters in VSCO preset names like C, F, L, N, O, and S mean?
How do I zoom a Vivitar 75-205mm f/3.8-4.8 lens for Minolta MD?
How do I set up an older Miranda multi-dedicated flash with a Fujifilm S7000?