Close Focus Distance Limits?

[cones]

I'm wanting to implement some cameras in hallways and smaller office rooms, but noticed the 180 camera below has a "close focus distance" of 3.6m (11.81ft) Does this mean it should not be used for a smaller area and won't have the ability to focus on subjects any closer than 11 feet?

DH-IPC-PDW5849-A180-E2-ASTE

https://us.dahuasecurity.com/product/dh-ipc-pdw5849-a180-e2-aste/

 

[bigredfish]

I havent used that specific camera but yes, in general thats what it means. Things will get blurry or increasingly less focused inside of that distance

Very obvious on the bigger 1/1.2" sensor 5849T1 (color 4K-X)

 

[guykuo]

This settings are still on auto otherwise it would also make sense to me if I had manually set black and white there that I would then no longer have a colored image.

No kidding. The limited depth of field on the big sensor and low f number lens makes near objects very noticebly blurred. Tack sharp beyond the critical, min distance, though.

 

[mat200]

I'm wanting to implement some cameras in hallways and smaller office rooms, but noticed the 180 camera below has a "close focus distance" of 3.6m (11.81ft) Does this mean it should not be used for a smaller area and won't have the ability to focus on subjects any closer than 11 feet?

DH-IPC-PDW5849-A180-E2-ASTE

https://us.dahuasecurity.com/product/dh-ipc-pdw5849-a180-e2-aste/

hmmm .. seems rather long the Close Focus Distance .. 11.8 feet .. I expected it to be shorter ..


Model Number: DH-IPC-PDW5849-A180-E2-ASTE

Close Focus Distance 3.6 m (11.81 ft)


( the more I look at this, the more I think there is a mistake .. can anyone confirm ? )









update: compare to

DH-IPC-HFWD8A1T-AZ .. which has a varifocal lens ..

 

[Mike A.]

That's a spec that you can't really rely on just looking at it on paper. I've seen some that go either way. A 5842 that I have I think that they list the close focus at ~6 feet but manually I could get it very good down to less than a foot. But then you still have the fairly short DOF so you start to lose things out 5 feet beyond that if you do. I think maybe they spec that at the closest focus to meet some minimum level with the overall focus set to infinity.

 

[mat200]

I'm wanting to implement some cameras in hallways and smaller office rooms, but noticed the 180 camera below has a "close focus distance" of 3.6m (11.81ft) Does this mean it should not be used for a smaller area and won't have the ability to focus on subjects any closer than 11 feet?

DH-IPC-PDW5849-A180-E2-ASTE

https://us.dahuasecurity.com/product/dh-ipc-pdw5849-a180-e2-aste/

Hi @cones

Perhaps picking a model up and testing it to see how well it works, here's and example I found on youtube where the camera still has on the protective film ..



ref:

Here is another one ..

 

[wittaj]

Hi @cones

Perhaps picking a model up and testing it to see how well it works, here's and example I found on youtube where the camera still has on the protective film ..

Ironically, the protective film only protects the black plastic. It doesn't cover the lens or white LED lol.