Shortest focal length thats not a fisheye...?
- Thread starter PatPend
- Start date
mat200
IPCT Contributor
- Jan 17, 2017
- 16,079
- 27,024
Hi PatPend,
The 2.8mm mini-dome wedge I have is already showing some distortion at the edges, and I don't recall seeing a lot of options for lens which have a wider FOV.
I have that problem too. Quality IP cameras come with lenses ranging from from 1 degree up to about 100 degrees horizontal and then there is nothing until 180 degrees.
That isn't to say there aren't a lot of cameras with 100-140 degree field of view, but every one I've seen is wifi garbage targeted at consumers who don't know RJ45 from RG9.
That isn't to say there aren't a lot of cameras with 100-140 degree field of view, but every one I've seen is wifi garbage targeted at consumers who don't know RJ45 from RG9.
The Dahua N68BR4V does its own dewarping before encoding, however it might not quality as affordable.
If that is the same as Dahua IPC-EBW8600 (about $400) then it is still about twice as much as I'm willing to pay.
CCTVCam
Known around here
- Sep 25, 2017
- 2,868
- 3,751
Depends on what you term fisheye. By fisheye, I'm assuming your wanting to avoid distortion, in which case it's not just the lenses focal length or whether it's a "fisheye", but whether it's rectilinear that matters.
eg. Here's a 280 degree fisheye lens (admittedly at $3.5K a very expensive board lens), but just look how straight the lines are when fitted to a gopro (the video is 360 - just pull the pic to rotate):
So personally I'd find out what focal length is going to suit your needs (maybe using the CCTV view calculator), then start searching for a lens with the correct screw thread that's also rectilinear (and preferably viewing some video example clips shot on it to ensure it's truly distortion free).
Also, be aware the wider you go, the less pixels per inch you have and so the lower the quality / recognition, not an issue if you have another camera capturing a zoomed in picture, but maybe an issue if the ultra wide lens is your only lens.
eg. Here's a 280 degree fisheye lens (admittedly at $3.5K a very expensive board lens), but just look how straight the lines are when fitted to a gopro (the video is 360 - just pull the pic to rotate):
So personally I'd find out what focal length is going to suit your needs (maybe using the CCTV view calculator), then start searching for a lens with the correct screw thread that's also rectilinear (and preferably viewing some video example clips shot on it to ensure it's truly distortion free).
Also, be aware the wider you go, the less pixels per inch you have and so the lower the quality / recognition, not an issue if you have another camera capturing a zoomed in picture, but maybe an issue if the ultra wide lens is your only lens.
I am trying to send a round fisheye image on the main stream as well as a sub stream that is de warped in the camera as a 4 cube view. This is supposed to be possible per the Dahua Specs. But i can't make it, how we do?
I don't know. I would expect the dewarp options to be on the same page as the sub-stream encoder options. I don't have any 180° fisheye cameras so I don't know what might be different about their configuration.
Thank you! I have a client booked this one.
PSD81602-A360 . I will show here later when I get it.super big one
Roman G
Young grasshopper
- Nov 3, 2017
- 45
- 6
What is the price for ot in USA?
What will be the purpose of it's use for the client?
Just get this monster
8x2MP Multi-Sensor Panoramic Network Camera+PTZ Camera
PSD81602-A360
. my office is too small, can't test it lol, this better put on a big area.
Package
Compare to SD59225U-HNI
8x2MP Multi-Sensor Panoramic Network Camera+PTZ Camera
PSD81602-A360
. my office is too small, can't test it lol, this better put on a big area.
Package
Compare to SD59225U-HNI
Attachments
Last edited:
mat200
IPCT Contributor
- Jan 17, 2017
- 16,079
- 27,024