DazedAndConfuzed
Contributor
Since my flat port is in a stage where it might go kaput in my process of clearing whatever crap that is on it, I was looking at the option of getting a dome port. I had a few questions about how it works.
1. I heard it creates a virtual image 1 or 1.5ft in front of the lens (or is it film plane?) Does that mean everything from 1 or 1.5ft (lens, port or film plane) to infinity is in focus?
2. How do I take picture that is closer than 1 or 1.5ft? My 24mm could focus down to 10".
3. If I decrease the f-stop to f16 or f22, would that increase the depth of field of the dome image down to 9in or 1.2ft (depending whether it is 1 or 1.5ft focus.)
4. I heard a 24mm lens in a dome port preserves its above water coverage angle. I presume this is true.
Thanks for any information that you could provide.
1. I heard it creates a virtual image 1 or 1.5ft in front of the lens (or is it film plane?) Does that mean everything from 1 or 1.5ft (lens, port or film plane) to infinity is in focus?
2. How do I take picture that is closer than 1 or 1.5ft? My 24mm could focus down to 10".
3. If I decrease the f-stop to f16 or f22, would that increase the depth of field of the dome image down to 9in or 1.2ft (depending whether it is 1 or 1.5ft focus.)
4. I heard a 24mm lens in a dome port preserves its above water coverage angle. I presume this is true.
Thanks for any information that you could provide.