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Samsung NX-mini: M48, M42 Mount

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 :,236962.125.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

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

Add a M48 x0.75 Mount Thread to your NX-mini

How to Add a M48 x 0.75 Mount Thread on your Samsung NX-mini
Please, don't begin doing it if you don't feel able to achieve it...
It's Your Own Full Responsability to do it... Or not to...
You have to find a M48 x0.75 T2 Mount Adapter of any brand, with
the thicker 8mm M48 threaded Inner-Ring + a M48 to M42 Adapter
– 0) remove Battery & Lens + Protect the Sensor from Glue, Scratches
– 1) unscrew the 3 screws that hold the Inner-Ring in the T2 Adapter...
– 2) remove this Inner-Ring : « 48mm conon » off the T2 Adapter...
– 3) Remove the Latch, Button, Spring off the Samsung NXm Mount...
( 3 & 4 need to remove the Front Panel : SamsungNXminiTopIR.html )
– 4) Cut the Aestetic-Ring off the Front Panel at diameter of Inner-Ring
– 5) Verify the Inner-Ring slips around the NXm Mount of the NX mini...
/!\ Crucial : the Inner-Ring to be firmly glued around the NXm Mount /!\
– 6) Screw the M48 to M42 Adapter in the Inner-Ring from its marked
... side, letting 4mm free M48 Female Thread at the Non marked side...
– 7) Cut a 48mm Paper diameter, put it at bottom of the 4mm free M48...
– 8) Prepare some Araldite glue, apply it on the 4mm free M48 Female :
... the Paper at bottom prevents the M48 to M42 Adapter to be glued too
– 9) Slip the 4mm free M48 Female Thread around the NXm Mount...
... keep parts quiet ~24 hours at ~22°C... unscrew M48 to M42 Adapter
put the Front Panel w/ enlarged hole back : SamsungNXminiTopIR.html

/!\ No Glue, No Scratch on Sensor /!\

Any brand M48 x0.75 T2 Mount Adapter w/ its 48mm conon Inner-Ring :
this Inner-Ring must be at least 8mm thick
T2 M48x075 Mount Adapter
Clic Image, Ctrl+ to enlarge more
If your Reflector, Refractor is an Up to Date instrument with a M48 thread...
... go to Adjusting the Focusing Distance... at the bottom of page
If your Reflector, Refractor is a Classic instrument with a M42 thread...
... you'll have to screw in the M48 to M42 Adapter
M48 male to M42 female Adapter :
M48 male to M42 female
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

An Easier way to add an M42x0.75 T2 Thread to your NX-mini...
... plus a Bonus 'C' Mount at the same time :

Easy M-42 T2 Mount Thread via "C" Adapter for NX-mini

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

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