Prev. Page             Main Page             Page Bottom             Next Page

Samsung NX-mini: C-Mount M42-T2

NX-mini Class-Leading Specs 4 Astro- / IR-Photo.

+ 4 min. Exposure at F/5 => NoiseLess ISO 400 !
+ a Top Resolution of 20.50 Mega-Pixel !
+ a Peak Quantum Efficiency of 84%
+ a Price of $100 €, or even less
+ IRcut filter Easy Removal

More Advantages to the Samsung NX-mini over other 1" BSI cameras
– the NX-mini is the unique 1" BSI cam. to support Interchangeable Lenses.
– MA4NXM optional Adapter opens the NXmini to the whole NX lens system.
– NX-mini has a Huge 2330 mAh Battery : lasts a whole night in worse conditions.
(– As nights become warmer, could be very easy to cool this camera from inside)
– Bulb Mode holds 240 sec. Long Exposure, the Top for AstroPhotography...
... so one can lower the setting down to a NoiseLess ISO 400 at F/5 !
– the NX-mini is a Costless camera : I bought mine for €183 in spring 2015.
– the IR-Cut Filter inside the Samsung NX-mini is very Easy to Remove :
– IR-Cut removed, the Auto-Focus is still Reliable with 9 + 9-27 mm lenses,
the NX-mini could be the Best for Landscape-IR : nor High-ISO, neither Tripod,
get ten times, 10x the Light, for twice, 2x the Price of 1 R72 IR-Filter :
Zwo mono AstroCams Relative QE
Clic Image, Ctrl+ to enlarge more

I superimposed the curves of Relative QE from 3 Zwo BSI mono Astro-Cams :
the Asi178mm is very sensitive toward the Blue, the Asi290mm which sensor is
advertised as Near-IR by Sony, and the Asi183mm which seems the very best
compromise between the 2 others ! At 656 nm, their Relative QE is : ~60% for
the 178, ~80% for the 183 and ~93% for the 290 ! If I could achieve the same
"easily readable graph" for their Color Version with a Bayer Filter, I'll do it. But,
there is no reason things will change dramatically. What we can see here is their
Silicon response to different wavelengths and the effect of deeper photodiodes :
the deeper, the more IR sensitive. Asi183mC & Samsung NX-mini could reach
an Absolute Peak QE of ~84% in both Green channels, an excellent sensitivity !

Asi533MC vs Asi183MM-Cool vs Samsung NX-mini :
Clic Image, Ctrl+ to enlarge more

The Drawbacks of the Samsung NX-mini with its 1" imx183 BSI sensor
– ISO 1600 shows Amp-Glow localised in the Bottom Corners of the frame,
but the 240 sec. Bulb Exposure was enough. I just once had to set to ISO 800 :
wind and Turbulence were so strong that Guiding over 30 sec was very difficult !
U do need ISO1600, it's not so bad to reduce the format ratio from 1.5 to 1.4 or
even to 1.33. That means from 8.8 x 13.2 to x 12.44, even to x 11.74 mm wide.
DSS-336, Levels upped to Highlight the ISO 800 Amp-Glow at bottom corners
Amp-Glow NX-mini ISO-800
Clic Image, Ctrl+ to enlarge more

I Never subtracted nor Bias-Maps (Offsets) neither Dark-Frames from my subs.
Even during Last Summer 2019, where nights Temperatures climbed over 25°C !
But you do need a Set of 3-4 ISO-100 Flat-Fields from your well-lit clear ceiling

Samsung NX-mini for Astro-, Landscape-IR-Photo.

How could this small CostLess digicam become an IR Must-Have ILC ?

2015, the Best Canon APSC Camera has got a 1" BSI Sensor :

Clic Image, Ctrl+ to enlarge more

Despite tiny sensor 33% the area of APSC, the 1" BSI shows 70%
of the DxoMark-ISO Sensitivity of Renown Canon Eos 60D(A), 600D...
PowerShot G7X & Samsung NX-mini both have the Sony imx183 BSI sensor
~> Sensor's main page for more detailed informations : SensorCompare.html
~> Samsung NX-mini tests :

~> Sony imx183 BSI CMos sensor specification sheets :
~> ProColorCam :
~> ProMonoCam :
~> Scientific = Spectro-photography :
Few years ago, you'd have to be a Fortunate Professional Researcher to get a
BSI CCD sensor with High Energy Waste, and High Dark Current Level, and No
possibility to get the Signal Cleaned, then Digitized "on chip" : The Exmor Bonus !
Astro-Photography-DSO :,236962.175.html
DPReview : Nikon1v3, Nikon1v1, 1j1, PentaxQ7, Samsung NXmini, SonyRX100
- Nikon 1 (1" FSI), Pentax Q7 (1/1.7" BSI) : lower Raw & Low-Light-ISO scores
- Samsung NX-mini, Sony RX100 (1" BSI) : higher Raw & Low-Light-ISO scores
Clic Image, Ctrl+ to enlarge more

Add a 'C' Mount Thread to your Samsung NX-mini

Adding a 25 x 0.75 'C' Mount Thread on your Samsung NX-mini

Where to find a 25 x 0.75 'C' Mount Adapter for Samsung NX-mini :

25 x 0.75mm 'C' Mount Lens Adapter for Samsung NX-mini

Clic Image, Ctrl+ to enlarge more
For AstroPhotography purpose or Lenses with a M42x0.75 T2 threaded Mount...
... then you'll have to screw in the 'C' to M42-T2 Adapter
'C' male to M42 T2 female Adapter :
an easy to find one
Clic Image, Ctrl+ to enlarge more

Adjusting the Focusing Distance with Extensions :
– 1) The distance from the Sensor to the NXm Mount is ~ 7.5 mm ~
– 2) Backfocus Distance of your instrument minus 7.5 = ~ the lenght to add...
– 3) With the Moon / a Bright Star, verify the Right Focusing on the Sensor...
Backfocus Distance of a T2 instrument or lens = 55mm

Never point Optical Instrument toward the Sun w/o AstroSolar Filter

Never hold Heavy Optics From the Samsung NX mini !

Astro-Photography possibilities are infinite :
Bravo, you did it !
The whole sky full of Deep-Sky-Small-Objects is yours now
Bests photos are ~3000 pixels Wide !
     ©Dima Lootvoet 2010-21

Prev. Page             Main Page             Top of Page             Next Page