ASI174MM Mini (mono)


ZWO ASI174MM Mini is Available Now!!!

SKU: ASI174MM-M Categories: ,

Product Description

ASI174MM Mini camera integrates Sony IMX174LLJ / IMX174LQJ 1/1.2″ sensor (11.3 mm x 7.1 mm). It is ZWO first mini camera. This camera has 1936 x 1216 pixels. The pixel size is 5.86 μm x 5.86 μm.  This camera provides 12bit ADC and its QE peak is 77%.

Astrophotography Performance

ASI174 mini camera offers you very good performance for planetary imaging and guiding. Low read noise, high dynamic range, QE peak 77%, AR protective window and much more.

174 Gain RN DR FW vs gainHigh QE

Absolute QE Curve, we estimate the Peak Value is about 77%.



174Mini vs. 174MM

Compared with ASI174MM camera, 174mini has smaller outlook, lighter weight, and it can reach focus with eyepiece at the same position.


USB2.0Port & ST4 Port

USB 2.0 Port: Mini cameras have one USB2.0 type C port. Type C port is very popular among mobile phones, it doens’t matter with the  positive side and negetive side of the adapter.

ST4 Port: Can connect mini camera directly to the auto guide port of mount.


Connecting Drawing企业微信截图_15349961443718

  1. M28.5-CS adapter
  2. CS-C adapter
  3. 1.25″ extender
  4. 1.25″ filter

Mechanical Drawing

What is in the box?

ASI mini camera box includes all necessary cables, adapters, and manual.

174 290mini配件图

Drivers and Softwares:

Our website has newest camera drivers and many DSO and Planetary capture softwares. Please make sure the newest driver and software has been installed before you start shooting:




ASI174 and ASI290 mini camera have very beautiful outlooks, small size, lighter weight, this is not a big deal.

We should consider much more…

How to  choose a good guide camera?

Many people may say : it must be small, suitable for different equipments(guide scope, OAG), stable working.

Yes, I think thoes are basic demand for a good guide camera, and ASI mini camera can do them well.

So, what else we do care in the deep of our mind?

I think there will be three potential requests: high sensitivity, precisely guiding, big FOV.


High Sensitivity

Sensitivity is the first thing we considered. it is very important to look for a guide star. So at the beginning, we were considering to use mono sensor to design our guide camera only. Because mono sensor has much higher sensitivity than color ones. After that, we carefully compared the sensitivity of our sensors. At last, we decide to use 290 and 174  mono sensor. As we know, 290 and 174 mono sensor have about 80% QE peak, can detect more stars in view. Also, we can shorten the exposure time in guiding.

Precisely Guiding




ASI290 mini is designed for precisely guiding. 2.9um pixel size can give you a higher arcsec/pixel than 224 or 120 camera. Which means in same guide scope, 290mini can detect slighter movement of stars. ASI290 mini can improve about 30% guide precision than 120mm.








ASI174 mini is designed for Big FOV guiding. This is very useful in OAG to looking for a guide star. When you using OAG guider to work with Ritchey-Chretien or Schmit-Cassegrain telescope, the hardest part is to looking for a guide star. ASI174 mini have 1/1.2″ big sensor which means you can have  4 times bigger Fov than 120mm.





Smiling Face

The back of ASI mini camera is like a smiling face, it’s mouth is Type C USB port, which is widely used in mobile phones. And it’s nose is ST4 port, for guiding. Every time, you use mini camera, there will always a smile face stay with you in the dark nights.

174miniVS290miniFocus like a eyepiece

ASI mini camera and eyepiece can  reach focus at same position. You can focus with an eyepiece, and put ASI mini camera into 1.25″ holder.

画板 1

Work with OAG

Mini camera is very suitable for OAG, it can have much biger focus range than normal ASI cameras. Never to worry about that guide camera can not focus with main camera at same time.


Work with CS adapter and CS lens

P1040896Work with 1.25″ extender


ASI mini camera is available now! You can buy it form us or our dealers! Wish you all have clear skies!



Sensor: 1/1.2″ CMOS IMX174LLJ / IMX174LQJ
Resolution: 2.3Mega Pixels 1936×1216
Pixel Size: 5.86µm
Exposure Range: 32µs-300s
ROI: Supported
Interface: USB2.0
Bit rate: 12bit output(12bit ADC)
Adaptor: 1.25″ / M28.5X0.6
Dimension: φ36mm X 61mm
Weight: 140g
Working Temperature: -5°C—45°C
Storage Temperature: -20°C—60°C
Working Relative Humidity: 20%—80%
Storage Relative Humidity: 20%—95%
1936*1216 18.4fps


  • Fast Shipping(amount ≧ 299USD) for free
  • Fast Shipping(amount < 299USD) : $20.00
  • Free Shipping(amount < 299USD) (Air Mail, 3-4 weeks) (Free)


  1. Fast Shipping: we will choose DHL, UPS, TNT, EMS etc to deliver it. Usually you will get your package in one week. We provide free fast shipping for order ≧ $299 or charge extra $20 for order < $299.
  2. Free Shipping: we will ship via DGM or China Post Registered Air Mail. It usually costs 2-3 weeks to reach US or Europe and costs 3-4 weeks to reach far places.
  3. Customers from Brazil and Chile should leave a message to provide your CPF or CNPJ as your custom needs it.
  4. Customers from Russia need to provide the name of your company.

Tracking site:


China air mail:


  • The price list on our website is USD without tax.
  • Please note that buyers areliable to pay tax involved, such as Import tax, VAT , customs handling fee, etc. The additional fees may be collected at time of delivery by courier.
  • For best local service we advise customers buy our cameras form local dealers.

Warranty and Return Policy

  • We provide 2-year warranty for our products, we will offer the repair service for free or replace for free if the camera doesn’t work within warranty period. After the warranty period, we will continue to provide repair support and service on a charged basis.
  • This warranty does not apply to damage that occurred as a result of abuse or misuse, or caused by a fall or any other transportation failures after purchase.
  • Customer must pay for shipping when shipping the camera back for repair or replacement
  • If you get a faulty camera, please contact us as soon as possible though email: Please describe the problem in detail and we will do our best to help you solve the problem. Most instances perceived problems are simply bad driver install or software configuration.
  • For customers who bought the camera from our dealer, dealer is responsible for the customer service for you.


Before first usage of this product read manuals and install correct drivers and software.

Do you have question, answer or comment? Post here!

  1. :

    Hi Sam. How suitable is the ASI174MM Mini for use with a C6 and hyperstar for DSO? The form factor looks good and should not encroach into the light path. I know it’s mono, but I can always get the appropriate sliding filter wheel. Given how short the exposures can be with hyperstar I’m not sure if a cooled camera offers much advantage over uncooled. Your thoughts?



    • Sean Wang


      Hi, 174mini have M28.5 threads and 1.25″ diameter, I think there are some adapters required between camera and hyper star system to get best back focus.
      Cooled camera has lower noise than uncooled camera, but, uncooled camera still can do some DSO imaging under short exposure time.


  2. :

    Does USB 2.0 of mini cameras means lower speed of FPS compared with classic USB 3.0 cameras?


    • Sean Wang


      Yes, it is.


  3. :

    Does the ASI 174MM Mini support 2×2 binning? I am looking for a guide camera for my Celestron 9.25 Edge HD using an OAG. At F7 (reducer), the 1×1 binning will provide a good imaging scale however at F10 (2350mm focal length), I would have to binning at 2×2.

    Thanks in advance,


    • Sean Wang


      Yes, it does.


  4. :

    I am looking for a guide camera that has a good deal of sensitivity for the fainter stars. Would the 174MM Mini work well in such a situation? Basically, I am looking for something that surpasses the Loadstar X2.



    • Sean Wang


      Yes, 174mm and 290mm mini camera are have high sensitivity.


  5. :

    Besides the new form factor and USB 2.0 is there any other difference to the “old” ASI174 ??


    • Sean Wang


      No, there is no difference.


  6. :

    Hi guys, do the ASI mini cameras work with your Android Asicap app? I know you state on that only USB 3.0 works with Asicap, but I thought I’d ask anyway because of the USB type-C standard used for the mini cams. Many thanks :)


    • Sean Wang


      Yes, android asicap support mini cameras.


  7. :

    Hi Sam. Will this camera work with a standard USB C cable in case the one that comes with the camera fails?


    • Sean Wang


      It support USB type-c cable. Some mobile phone use that cable too.


  8. :

    Is there is a way to connect M42 lens to this camera?


    • Sean Wang


      174mini only have 1.25″ adapter, we don’t have correct adapter for M42 lens.


  9. :

    Does the D25 IR blocking window fit this camera?


    • Sam Wen


      yes, but we suggest you use one external 1.25″filter IR-CUT filter



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