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Samsung NX-mini, a Top IR camera

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 :

Sony1in-CanAPSc.png
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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 : https://www.dpreview.com/reviews/samsung-nx-mini
www.imaging-resource.com/PRODS/samsung-nx-mini/samsung-nx-miniA.HTM
https://www.ephotozine.com/article/samsung-nx-mini-expert-review-24605

~> Sony imx183 BSI CMos sensor specification sheets :
sony-semicon.co.jp/products/common/pdf/IMX183CLK-J_CQJ-J_Flyer.pdf
sony-semicon.co.jp/products/common/pdf/IMX183CLK_CQJ_CQK_Flyer.pdf
~> ProColorCam : astronomy-imaging-camera.com/product/asi183mc-pro-color
~> ProMonoCam : astronomy-imaging-camera.com/product/asi183mm-pro-mono
~> Scientific = Spectro-photography : http://www.astrosurf.com/buil/asi183mm/
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 : https://www.dpreview.com/galleries/tags/nx-mini
chassimages.com/forum/index.php/topic,236962.200.html
https://en.astronomike.net/u/6809.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
NikonSony1PQ7NXmini
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Samsung NX-mini Class-Leading Specifications

+ 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 NX-mini is very Easy to remove (read next).
– 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 :
https://www.google.com/search?q=landscape-IR-photography&tbm=isch
.
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, Altair-HC183M-Qhy183M-Asi183MM/Cool, Samsung NX-mini :
Asi533-183-NXmini
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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

Mounting the NX-mini at Prime Focus on a Scope

Via Samsung MA4NXM NX-mini to NX Adapter, Good Luck to buy one...
then you'll need a NX to M42 x 0.75 T2 Adapter, this one is easy to find.

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

M48 + M42 T2 Mount Thread on your Samsung NX-mini

IR-cut Filter Removal to increase IR + Red SNR

How to Remove the IR-Cut filter from the Inside of the 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...

– 0) remove the Battery and the Lens on a clean well lit clear surface...
– 1) remove the 4 screws that hold the Mount on the Camera...
– 2) remove the 6 screws that hold the Front Panel on the Metal Body...
...1 near the Lens, 1 in the Flash Port, 1 behind the Card Door, 3 at the Bottom.
– 3) gently separate the Plastic Front Panel from the Metal Body...

More Pictures here : Stop Disassembling at Step10-3 Sensor
– 4) unscrew 1 that holds the Ribbon-Cable on Eleven-Contacts-Plate...
/!\ Care not to bend the Ribbon-Cable, see 'Q1u' at Top-Right of the photo...
– 5) the IR-Cut filter Plastic-Support : gently bring its hooks closer to Lift it a little...
~> watch carefully the photography of the inside of the NX-mini showing this !
– 6) the IR-Cut filter & its gasket will slide down : to store in a clean paper wallet...
~> you can see the IR-Cut filter on the Wi-Fi Antena at left side...
The Density of the IR-Cut filter is about ~1.3 Ev.
Careful : No things on sensor !
.
SamNXmini-IRcutFilter
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For those who want to replace the original IR-Cut Filter with a Clear Glass or...
another IR-Cut Filter at 680 or 720 nm, here are its exact Dimensions :
- Thickness : 0.6 mm
- Height : 14.5 mm
- Width : 18.3 mm

– 7) let's operate in reverse order to reassemble the camera...
– 8) record a Custom-White-Balance setting from White Paper sheet...
– 9) shooting a landscape will show Pinkish Foliage...
IR-Cut removed, the Auto-Focus is still Reliable with 9 & 9-27 mm lenses
saving a Custom-White-Balance setting from Foliages, will show them Whitish :
https://www.pinterest.com/explore/infrared-photography/
Infrared Photo possibilities are infinite...
.
Tired of the Yew trees in the garden, you'd rather see Tamarisk trees !
NX-mini-9mm-lens-AF, Bare-imx183, WhitePaper-CustomWB :
NX-mini 9mm BARE imx183 Test
Modified NX-mini, 9mm f/3.5 @ f/8, 1/558 sec. ISO 100
Clic Image, Ctrl+ to enlarge more

Bravo, you did it ! ;)
Hand-held IR-Landscapes and Deep-Sky-Objects, are all yours now...
https://www.dpreview.com/galleries/tags/nx-mini
Bests photos are ~3000 pixels wide !
     ©Dima Lootvoet 2010-21

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