+ 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 + IR-cut 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 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(256)sec. Long Exposure, Top for AstroPhotography. – So one can lower the ISO 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 : SamsungNXminiTopIR.html
– 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 : Search.for/?q=landscape-IR-photography&tbm=isch . 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 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: 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 :
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 M42-T2 x0.75 thread 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 length 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
