The Hollyland Mars 400S Pro is a wireless video transmission system that is quite capable of a variety use cases. What you get in the box is a dedicated Transmitter and Receiver, an instruction booklet, 5 antennas, with one being a spare, and one AC adapter that is usable with either the transmitter or the receiver. We should start by saying how versatile the power options are on this device. You can power either the transmitter or the receiver via USB C, like a battery bank, via the Sony L-series battery mount, or via the DC adapter plugin.
Video Inputs and Outputs on the units are just as versatile. You can take either an SDI or a HDMI input on the receiver and output SDI or HDMI on the receiver as a start. It will even transcode an SDI signal to HDMI on the receiver which is a real benefit here. I’ve been using a 5600mah L-series battery, and that will run both the receiver and transmitter for serval hours each
The Mars 400S Pro can either transmit to 2 receivers, 1 receiver and 2 smart devices running the Hollyview app or simply four smart devices alone running the app.
I started by testing the range claims, which are 400ft for the receiver or 300ft for a smart device running the app. The range claims are easily met with line of sight and will still go hundreds of feet with some obstructions. The primary use case I can think of where this would be useful would be time-lapses where you could set and leave a camera, and then monitor the camera remotely from another building or vehicle. The receiver has a very good indicator on the OLED screen of signal quality as well, so you’ll know when you are getting close the limits of the range.
For mounting there is a shoe adapter as well as a ¼” screw mount on the bottom.
For other distant use cases, the USB-C port has some additional functionality. Essentially you can use it as a remote live streaming camera from the receiver which gives you some flexibility on adding as an additional camera source to a live stream to your switcher via network or direct video input that will give you a 12mb 1080p 60fps stream.
I was really excited to try the app, since I could easily see my self setting up multiple tablets or phones as a output option. The first thing I needed to do was load a LUT for my Blackmagic Cinema Camera. The way this works is that you want to add a LUT to a Google Drive, and then open that LUT in the Hollyview App. This will then show the LUT as an option selectable from the 3D LUT selection in the lower right-hand corner of the app.
The next big question was latency. Hollyview claims 80 milliseconds, which is observable here. That’s around 4 frames latency at 60hz, which is good for its intended use cases. I have had no issues getting accustomed to the slight delay on the output, even for focusing. You wouldn’t use this to transmit FPV video to a pilot, but if you had a camera strapped to the hood of a car to review driving footage, that would be a more ideal use case for this type of device.
I bring this up, since one of the downfalls of the original BMCC camera was the inconvenient location of the screen for almost all tasks, and the Mars 400S Pro really made me start using this camera again since it made the SDI output now convenient since I could output HDMI on the other end, or simply use the app like I’m doing here.
Next up is fan noise. The transmitter and receiver both come in auto mode, which has fan noise significantly quieter than a BMCC or a Red Epic, so auto has worked for me. However if the noise is an issue, you can turn the fan completely off and I haven’t seen that affect either the transmitter or receiver in any of my testing.
Some other notes on setup. The app is very nice that it remembers the last wifi setting and will prompt you on start to reconnect to the transmitter. Its extremely seemless. Navigation of the menus and channels is well thought out as well. Going back to power options, I’ve used all three extensively. The DC input is well placed, the L mount is as well, and it is really nice being able to use a standard USB-C powerpack in a pinch. The transmitter uses around 11 watts and the receiver uses around 7 watts so you’ll easily be able to power both for hours. Since your ipad is just connecting via wifi, you could potentially have a client with the ability to sit and watch all day from a different room without any fuss. The video quality at 12mbs is easily good enough for focusing, and there are focus tools in the app to help as well. Generally on the ipad screen, it simply looks broadcast quality as a live preview.
On stability, I have not had one issue so far on the devices having issues or dropping the stream or the wifi. Just like the aluminum build quality and picture quality, the Mars 400S Pro has yet to disappoint and I think it is an excellent value for the $649.00 MSRP.
Learn more about the Hollyland Mars 400s Pro here: https://www.hollyland-tech.com/products/detail-46.html Visit Hollyland’s Youtube Channel: https://www.youtube.com/channel/UClAx1jeRVieI7oT049gczVA