Accsoon CineView Master 4K Comprehensive Review

Guest Review

The Accsoon CineView Master 4K is a RTMS 4.0 protocol monitoring system, set up by Chinese company Accsoon.

Building a monitoring environment on set is a very important issue. Providing an appropriate monitoring environment for the many staff and cast members is a very important process. Many staff members, including the director and production team, as well as the lighting team, recording team, makeup artists and stylists, use the live footage projected on the monitor as a guide to carry out their roles. In that sense, building an appropriate size, accurate and stable monitoring environment is very important for filming to proceed smoothly on set.

In the past, video monitoring could only be done by wired connection, and even just connecting the cables required a lot of time and effort on location, considering the length and thickness of the cables, how to handle them, the risk of disconnection, etc. This became more complicated the more tight the schedule, and was extremely laborious when shooting outdoors or when there was a lot of movement between locations.

The Teradek Bolt, released in 2012, dramatically changed this complicated monitor environment. It adopted 5GHz wireless SDI/HDMI transmission, with almost zero latency. With a transmission distance of up to several hundred meters, the company’s products brought a revolution to film sets.

After that, various manufacturers released wireless transmission equipment, but they all had long delays or were unstable, and the performance was not satisfactory for use in complex shooting locations, so Teradek continued to have a monopoly on the market for a while.

However, Teradek’s products are expensive and, except for well-funded productions, are not always available on small to medium-sized, low-budget productions.

Enter Chinese Brands

In 2018, Chinese brands such as the Hollyland Mars series set their sights on this gap. Many inexpensive, high-performance products were released, but most of them were no match for Teradek in terms of stability and latency.

Amidst the ever-increasing pace of technological innovation, Accsoon has just released the CineView Master 4K. Not only does it far surpass the performance of other models, but it is also a very attractive product with a low price. This review goes over the Accsoon CineView Master 4K.

Accsoon CineView Master 4K Features

Speaking of product features, the first thing to mention is that it supports video input and output formats up to (3840×2160) 24/25/30/50/60 fps via HDMI input. Aside from the need for on-site 4K monitoring, this price is amazing for a product that offers performance approaching that of the latest Teradek products.

In addition, based on the proprietary RTMS 4.0 protocol, the company has integrated the 2.4GHz + 5GHz + 6GHz frequencies. By using three bands, it transmits with stability.. Although the frequency band is not something to be particularly concerned about when using it, the full-color LCD installed on the device displays the current frequency status. For this reason, six antennas of different sizes are installed on both the transmitter and receiver, one for each frequency.

Inputs and Outputs

In addition to 3G-SDI and HDMI 2.0 inputs on the transmitter side, there is an HDMI 2.0 through-out and an MFI-certified USB-C output terminal for using an iPhone or similar device as a monitor. The receiver side has 3G-SDI and HDMI 2.0 outputs, and a 12V 2A DC input terminal is implemented for both transmission and reception. An NP-F battery slot is also implemented on the back of both the transmitter and receiver, and an optional mount that can be directly connected to the camera’s V-mount is also available for the transmitter.

One of the features of this model is that it can be used with a dedicated app to receive signals simultaneously on mobile devices such as iPhones and Androids, but be aware that there are restrictions on the number and combination of receivers. Five combinations are possible, with a maximum of four receivers, meaning that up to four receivers and mobile devices can be used in any combination. If two receivers are used, then up to two mobile devices can be used (one wired connection is also possible, so up to five monitors can be used simultaneously).

Now, when it comes to this type of wireless device, especially those made by our neighboring country, China, the three points below are probably what bothers people the most on set:

Stable transmission and reception, distance, and delay speed
Time until video connection when powered on
Product quality

This time, I tried to verify the above three points in a simple way.

Checking points of concern on-site

First of all, one thing you may be wondering is how far it can transmit and receive signals at a practical level. The settings on the device were left as they were when the product was shipped, with the Wireless Bitrate Setting at the default of 9 and the VBR/CBR Setting at the default of CBR. This time, we tested how far an HD-HDI/30fps input signal could be received outdoors under clear skies and with good visibility.

The results showed that the reception distance was up to 330 meters in an environment with almost no obstructions. Anything further away caused frame drops in the video, and eventually a blackout. The manufacturer’s nominal value is 2.5 km, and it is concerning that there is a significant difference from the actual measured distance during testing.

Bit rate depends on a few variables, however.

However, it is highly possible that the distance may differ depending on the bit rate settings of the camera body, and we will continue to verify this point. At the very least, with a distance of 300 meters, as was the result of this test, I felt that there would be almost no problems with normal shooting except in special shooting environments.

The next thing I was curious about was the delay time. The manufacturer claims it is 25 ms, or 0.025 seconds, but what is the actual delay time?

Similarly, we shot using a Blackmagic URSA Mini Pro 4.6K G2 at HD-SDI/30fps, then displayed the transmitted signal on a Blackmagic Video Assist 7 inch 12G HDR and measured the frame delay. The measured delay time was 0.2 seconds, or approximately 6 frames. According to the manufacturers, the internal delay of both the URSA Mini Pro 4.6K G2 and Blackmagic Video Assist is less than 1 frame, so if we subtract 2 frames from the calculation, the calculated delay was 4 frames, or 133ms. As with the flight distance, it is likely that differences will occur depending on the set bitrate.

This result also differed from the manufacturer’s catalog value, but with such low latency as an actual measured value, it is unlikely to cause any significant disruption to specifications in the field.

Next, I measured the startup time when I turned on the power. The results were as follows:

Both transmitter and receiver on simultaneously for 61 seconds
Transmitter on, receiver on for 40 seconds
Transmitter on from receiver on state: 55 seconds
When both are turned on and a video signal is input from the transmitter, 4 seconds

I think that 3. is the most likely situation when shooting, such as changing the camera battery. Even when both are on, the video is output in a maximum of about 60 seconds, so it seems that you won’t feel too stressed even on a busy shooting site.

Finally, regarding the quality of the product, the body is made of aluminum and gives an impression of being very sturdy. The protruding antenna requires some care, but it doesn’t feel cheap at all. The display area is small, but the full-color LCD is very easy to read. I think this product would be in the low-priced category when categorizing it as professional equipment, but considering that, it is highly functional and can be said to be a very good value product.

As of the end of February 2025, the price is about 138,000 yen, which is quite cost-effective. Personally, I highly recommend this equipment. Why don’t you consider introducing it?