ZWO 2.5mm 170 degree lens
Format support: 1/2″ sensor
Focal length: 2.5mm
Wide angel: 170 degree
Match Model：ASI178MM, ASI178MC, ASI185MC
Before first usage of this product read manuals and install correct drivers and software.
Urs – September 7, 2019:
Is this lens fixed fous? It looks like the “focus” ring turns forever!
ZWO ASI Camera – September 9, 2019:
no, it is not fixed fous. you could fix with the screwdriver whihe you adjust the focal length.
Joel – September 2, 2019:
What is the purpose of the set screw? Can you move the lens element section in and out a bit to fine-tune back focus?
ZWO ASI Camera – September 2, 2019:
This screw is used to fix the focus ring of the camera.
Giritharan – May 22, 2019:
Does this lens have thread below for m25.4×0.75?
Katherine Tsai – May 22, 2019:
No it doe not have.
Huw – March 8, 2019:
Can I use this zwo-2-5mm-150-degree-lens on asi183mc color? if not, can you recommend a fisheye lens for asi183mc color? Thanks a lot!
Katherine Tsai – March 15, 2019:
183 sensor is too big for fisheye lens.
Arvid – December 24, 2018:
Sam Wen said: “it’s F2”
But it says 1:1.2 on the front ring! Is that wrong? The light gathering capability difference between these numbers is huge; an f/1.2 lens gathers about 2.8 times more light than an f/2.0 lens! So which is it?
Also, what does the “IR” signify? That it is transparent at IR wavelengths, or that it cuts IR?
Katherine Tsai – December 26, 2018:
Sorry about that. It F1.2, as it is said on the front ring.
33-4 – October 8, 2018:
If I use CS/C conversion adaptor , does this lense work with ASI290MM-Cool ?
Sean Wang – October 9, 2018:
290mm-c work with CS mount, will support C type lens, because the back focus is 17.5mm
Hide – August 4, 2018:
Doesn’t work with any cooled camera including ASI178MC-Cool?
Sean Wang – August 6, 2018:
Yes, that’s correct.
Brian – November 18, 2017:
Does this lens work with the new ASI385MC? Also… what is the focal ratio?
Sam Wen – November 21, 2017:
this lens come with ASI385MC it’s F2
Sandra (verified owner) – October 8, 2017:
I’d got one for a ASI178MM-Cool and can’t reach focus. I used the T2 To CS or C adapter adapter I appears to say it should work with the ASI178MM what am I missing
Sam Wen – October 9, 2017:
this lens is CS lens, cannot be used on our cooled camera whose back focus distance is 17.5mm
Jaeong – September 10, 2017:
Can I use this lens for ASI224MC? I wanna make all sky camera.
Famous low noise cooled ZWO ASI cameras. Color or Mono CMOS sensors to be cooled to 35C to 40C degrees below ambient! more
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We will be out of the office during the Chinese New Year holiday period from Jan. 22th to 31st. Orders placed after Jan 20th, 2020(UTC) will be arranged on Feb 3rd.