Hi,

I have tested both recently.
The PtzOptics does not have the NDI upgrade available yet so I pulled the stream via RTSP (H264 - MPEG4).
[On a side note the NDI upgrade for PtzOptics is introducing NDI 3.0, aka NDI-HX, aka improved H264. That means that NDI-HX compared to NDI will be a middle ground between pure RTSP/H264 born delays and NDI (max 1 frame delay). Some extra delay is to be expected from NDI-HX according to their spec sheets also. Also NDI = 100Mbits, NDI-HX = 10Mbits.]
Depending on your particular workflow the delays can be accepted. But if you wish to stream to a live audience (conference center style, filming and displaying on the big screen the live performance in the same room) pure NDI might work but I would recommend to stick to SDI for this.

For Live Streaming only, where you can accept delays, you can go with either.
This was my use case. This is why I'm able to use RTSP currently.

There are some delays in using RTSP/H264 vs NDI, but in my opinion and my particular use case, it does not make sense to pay the premium.
These are the short comparison results betwin the NewTech NDI Camera and PTZOptics 20 SDI Gen2.

Delay:
-Sub 1 sec compared to what happened on the stage for PtzOptics (aprox 600ms)
-NDI vs RTSP = strangely it was almost the same!!! - maybe about 70-100ms

PTZ from Vmix (ONVIF):
-It work straight forward for PTZOptics (for setting and calling presets it works great! Please note that you will probably need a PTZ controller also if you need to move the cams outside of your presets for LIVE performance, house of worship...etc). We have both vmix presets and PtzOptics IP Controller.
-It did not work for NewTech NDI Camera... You can control it via the NDI Studio Monitor and mouse but that might be ok for testing but nothing more.

If you have SDI cameras currently, you might have to add some delays (in frames) on each of the SDI inputs to match then with NDI or RTSP.
Do not forget to re-sync audio also!

I have a mix of both currently and it works just fine after doing all of the tweaks.

NDI|HX uses a long GOP compression method and will be slightly higher than full bandwidth NDI which is 1 frame of latency in software solutions. For using a long GOP compression type, NDI|HX offers very low latency. All PTZ cameras currently on the market that support NDI (NewTek, PTZ Optics, Panasonic) are using NDI|HX.

Overall the NewTek PTZ1 and the PTZ Optics cameras probably are pretty close in specs and features. However, one difference I do know is that the NewTek PTZ1 does support fractional frame rates which can be important if you are operating in NTSC countries.

Kane Peterson
NewTek

Can these cameras also use the standard NDI protocol?
Bandwidth is not an issue for me, but low-latency the more, because I want to display the cameras live on screens.

These cameras cannot support the full NDI protocol, just the NDI-HX version. There are SDI/HDMI outputs on these cameras, which could be better for IMAG workflows.

As for max video support, I know the NewTek PTZ1 supports up to 1080p60. I'm not familiar with all of the specs of the PTZ Optics models.

So today the only PTZ full NDI options are from BirdDog?