ASI678 Manual
Revision 1.0
Aug, 2022
All materials related to this publication are subject to change without notice and its copyright totally belongs to Suzhou ZWO CO., LTD.
Please download the latest version from our Official website.
Instruction
Congratulations and thank you for buying one of our ASI Cameras! This manual will give you a brief introduction to your ASI camera. Please take the time to read it thoroughly and if you have any other questions, please feel free to submit it on the ZWO support site:
https://support.astronomy-imaging-camera.com/ The ASI678MC is one of the latest color planetary cameras released by ZWO in 2022. Packed with Sony sensor IMX678, this camera has some very great highlights, including super low readout noise, high dynamic range, and a surprisingly amazing characteristic of zero amp glow. It is considered as the upgraded version of ASI178MC.
| Model | Mono/Color | Sensor |
| ASI678MC | Color | SONY IMX678 |
For software installation instructions and other technical information, please refer to our official website https://astronomy-imaging-camera.com/
What’s in the box?
ASI678MC 
Camera technical specifications
| Sensor | SONY IMX678AAQR1-C |
| Format | 1/1.8″ |
| Diagonal | 8.86mm |
| Resolution | 8.29 Mega Pixel, 3840*2160 |
| Pixel size | 2.0 pm |
| Sensor size | 7.68mm * 4.32mm |
| Max fps | 48. |
| Shutter | Rolling shutter |
| Exposure range | 32 ps-2000s |
| Readout noise | 0.6 — 2.7e (le@8db gain) |
| QE peak | 83% |
| Full well | 11.271ce |
| ADC | 12bit |
| USB interface | USB 3.0 /USB 2.0 Type-B |
| Adapters | 1.25″ /2″ /M42*0.75 |
| Protect window | IR D21*Imm |
| Dimension | 62mm |
| Weight | 126g |
| Back focus length | 12.5mm |
| Supported OS | Windows, Linux & Mac OSX |
QE graph & Read noise
QE and Read noise are the most important parts to measure the performance of a camera.
Higher QE and Lower read noise are needed to improve the SNR of an image. The following figure shows the QE curve of ASI678. According to our measurement, the QE peak of ASI678 is 83%.
As you can see from the camera performance graph, the readout noise of ASI678 is very low. The built-in HCG mode can, even more, reduce readout noise at high gain and keep the same wide dynamic range for this camera as at low gain. When you set the gain at 182, the HCG mode will be automatically turned on. Readout noise in this case can be as low as 1.0e while the dynamic range can still get close to 11bit. 
No amp glow
ASI678 exhibits zero amp glow, no matter how long the exposure and how high the gain value is. Since it is implemented directly at the hardware level, it does not require software control. 
Getting to know your camera
6.1 External View 
① USB 3.0 & USB 2.0 Input
② ST4 Guide port
③ IR Protective window D21*1mm
④ 1/4” screw: allowing you to mount the camera to the tripod.
6.2 Structural dimension diagram 
6.3 Power consumption
ASI678 camera is built with low power consumption, max at 1.875W with USB power supply.
6.4 Analog to Digital Converter (ADC)
The ASI678 camera records in 12bit ADC and 10bit ADC. You can image at a faster fps rate if you use 10bit ADC (high-speed mode). You can also set an ROI if you want an even faster fps rate. Below are the maximum speeds of ASI678 running at different ADC modes.
| Resolution | USB3.0 | USB2.0 | ||||
| 12BIT ADC | 10BIT ADC | 12BIT ADC | 10BIT ADC | |||
| RAW16 | RAW8 | RAW8 | RAW16 | RAW8 | RAW8 | |
| 3840*2160 | 24. | 48. | 48. | 2.61fps | 5. | 5. |
| 1920* 1080 | 95. | 102 | 102 | 10.4fps | 21. | 21. |
| 1280*720 | 149. | 149. | 149. | 23.5fps | 47 | 47 |
| 640*480 | 215. | 215. | 215. | 70.5fps | 141. | 141. |
| 320*240 | 388. | 388. | 388. | 280.5fps | 388. | 388. |
6.5 Binning
ASI678 camera supports software bin2, bin3 and bin4 mode and hardware bin2, bin3, and bin4 mode.
The biggest benefit is a faster frame rate. If you don’t care about speed, we suggest you use software binning.
How to use your camera
There are many adapters available for this camera for connecting to your scope or lens. Some are included with the camera and others you can order from our site:
https://astronomy-imaging-camera.com 
① 1.25” Nosepiece
② 1.25” filter (optional) 
Notice for use
Below are the requirements for camera storage and working temperature. Please don’t use your camera when the environment does not meet these requirements, otherwise, the camera might get damaged.
| Working temperature | -5°C ~50°C |
| Working humidity | 20% ~ 80% |
| Storage temperature | -20°C ~ 60°C |
| Storage humidity | 20% ~ 95% |
Do not use corrosive solutions to clean the camera, so as not to corrode the surface oxide layer and not to damage the camera; Meanwhile, do not expose the camera to the sun or a long time, so as not to discolor the appearance of the oxide layer.
Cleaning
The camera is sealed and comes with an IR protection window to protect the sensor from dust and humidity.
To see the dust, you just need to set up your telescope and point it to a bright place. A Barlow is required to see this dust clearly. Then attach the camera and adjust the exposure to make sure not overly exposed. You can see an image like below if it’s dirty. 
The big dim spot on the image (right side) is the shadows of dust on the protective window.
The very small but very dark spots on the image (at left) are the shadows of the dust on the sensor.
If the above situation occurs, it is recommended that the dust on the sensor surface be blown off with an air pump. If it cannot be blown off, it is recommended to use cotton swabs and 99% anhydrous ethanol to gently wipe the sensor. We have very detailed instructions on our website:
https://astronomy-imaging-amera.com/manuals/How_to_clean_ASI_camera_and_redry_the_desiccant.pdf
Warranty
- ZWO will provide a 2-year free warranty service (Warranty Period) for ZWO products purchased by Users from ZWO (“Products”) in accordance with this Policy, commencing on the day following receipt of the Products by Users. For ASIAIR Plus users, commencing on the day of device activation.
- If a User encounters the following Dead on Arrival (DOA) and contacts ZWO within the corresponding time limit to issue the Product purchase invoice and relevant evidence, ZWO will provide door-to-door pick-up service and, as appropriate, after-sale replacement (or partial replacement), repair or return (or partial return) service for the following Products:
1) Product quality problem Provided that a User detects a quality problem and contacts ZWO within 30 days after receipt of the Products, and the ZWO support team confirms that the Products indeed have a quality problem or defect after their inspection, ZWO will provide free replacement service towards such Products;
2) Product transportation problem Provided that a User finds obvious signs of bubbling, serious overstocking, or deformation on the outer package of the Products upon receipt of the Products, and provides ZWO with pictures of the outer package and proof of receipt within 3 days after receipt of such Products, ZWO support team will verify the actual shipper and determine the responsible party for such transportation problem. In the event that ZWO is the actual shipper, ZWO will be responsible for providing the relevant return or replacement service, however, if the Products are directly sold or transported to the User by an agent of ZWO, the agent will be responsible for providing the relevant return or replacement service - If the Products are under the following circumstances, they are not within the scope of warranty service, ZWO may provide maintenance services to the Users:
1) The Warranty Period of the Products has expired; or
2) The Products are injected into liquid or affected by moisture or corrosion; or
3) The Products are damaged by an external force (such as the broken camera protection window glass, the deformation of the product shell, the broken of USB port, etc.); or
4) Disassembling, repairing by a third party, refurbishment of the Products (such as downloading erroneous firmware) without the written authorization of ZWO; or
5) The product system is modified, or the maintenance notice is lost or changed; or
6) Product quality problems caused by installation not following the requirements or instructions for the Products; or
7) Physical damage or failure of the Products caused by the force majeure (such as strong vibration or extrusion such as flood, fire, earthquake, or thunder stroke); or 8)Damage caused by the improper User operation during the period of shooting or use, such as using without the equipment protection or direct shooting of the sun; or
9) No valid purchase invoice or warranty certificate; or
10) The Products are second-hand products.
Any quality problem with the accessories or other parts of the Products is not a condition for the return or change of the Products, and the User may solely request to replace the accessories with new ones, which shall be handled after verification by the ZWO support team. If the issue with your ZWO product was caused by certain damage (such as severe damage not covered by the 2-year warranty), you might have to pay the replacement value.
Servicing
For software upgrades, please refer to “Support-manual and software” on our official website. https://astronomy-imaging-camera.com/
For repairs and consultation, you can visit here: https://support.astronomy-imaging-camera.com/
Note:
- For the normal repair or replacement of the Products during the Warranty Period, the User will bear the return cost. When returning the Products, Users shall specify the actual reasons for the damage to the Products, and shall provide the corresponding valid certificates, such as pictures or videos, etc.
For the Products that need to be replaced after being confirmed by ZWO in writing, the User shall return the Products with the complete package, together with all accessories, manuals, etc., to the address designated by ZWO.
By sending back the product to ZWO, the User agrees to pay out-of-warranty fees that may arise during the repair process of the product. ZWO will send back the product after charging. - For the Products that need to be returned for after-sales service, ZWO will provide the corresponding RMA code for reference.
ZWO will not accept any products having no RMA code that have been returned privately without ZWO written confirmation. - If a User purchases the ZWO Products from a ZWO agent, the User may contact the ZWO agent directly for the relevant after-sales service.
Documents / Resources
 |
ZWO ASI678MC 12 Bit CMOS Color Camera [pdf] User Manual ASI678MC, 12 Bit CMOS Color Camera, ASI678MC 12 Bit CMOS Color Camera, CMOS Color Camera, Color Camera, Camera, ASI678MC OSC Planetary Camera with Low Noise |
ZWO ASI – Astronomy Cameras 
ZWO ASI | Support 
