Camera simulator, Exposure calcul

- Set Scene Light Value : -- Pls choose Scene Light Value to start with -- -6 Ev Guided EQMount Dso AstroPhotography -4 Ev Guided EQMount DSO Astro Orion-full -2 Ev EQMount DSO Astro-Photo M42-core 00 Ev Very Dark areas at night 02 Ev Dark streets at night, Dark indoor 04 Ev Poorly lit areas at night, ditto indoor 06 Ev Normally lit night streets, ditto indoor 08 Ev Las Vegas at night, Grand Casino indoor 10 Ev Near Sunrise or Sunset scenes 12 Ev Overcast daylight or open shade 14 Ev Sunny Landscape under Blue sky 16 Ev Sand, Sea, Snow in Bright sunlight
- Set Increm/Decrement Step : --- Pls choose Step: 1, 1/3, 1/6 --- 1/1 Ev Increment/Decrement Step 1/3 Ev Increment/Decrement Step 1/6 Ev Increment/Decrement Step

 set F/  +Aperture– CalcApe set SS +ShttrSpeed– CalcSS calcul.

- Iris Aperture : f/   - Shutter Speed :  sec.

- Sensitivity : iso   - Scene Light Value :  ev.

 set ISO –ISOSensi+ CalcISO set LV –LightValue+ CalcSLV calcul.

Reset (in case) Step=1 Scene=10Ev - date: .
left / right: decrease/increase Aperture, ShutterSpeed, ISO, SLV - Numbers.
- / +: Decrease / Increase - Amount of Light on sensor / image Brightness.
Calculate: Aperture, ShutterSpeed, ISO, SLV from the 3 Other Values.
3 Ev Steps: 1, 1/3, 1/6 - 12 Scenes: Light Values –6 Ev to 16 Ev.
For 1/2 Ev increment, Set 3/6 Ev Equivalent increment.
From " Precise-Values " To " Nominal-Settings ".
- Number inside v. Setting on the camera.

Precise Maths-values -vs- Nominal-Settings

Pls take a look at 1 old lens, Standard ~50(FF) or ~30(APS) Lens is ok.
on its Aperture Ring, you can distinguish 2 types of Numbers interlaced:
-1, 2, 4, 8, 16, 32, 64: Powers of 2 Never need Rounding nor Truncating.
-1.4, 2.8, 5.6, 11, 22, 45: √2 Multiples do need Rounding before printed,
can seem irregular at 1st look. In fact, Multiplier is √2 from 1 up, for All,
finally Aperture's Diameter is finer to print on Lenses than Area's big #s.
'#' ASCII character code 35 decimal or 0x23 hexadecimal for "Number".
Light Value is Function of Aperture² : Exposure gains 1 Ev for each F/.

Nominal Settings of Cameras: the Lenses' Aperture Ring's numbers F/.
XIX^th century, bad habit was taken to Mix Rounded vs Truncated values.
2.8=Round(2.828427) but 5.6=Trunc(5.656854) vs 11=Round(11.3137).
Back to Trunc(22.627417) is 22, and finally, 45 is Round(45.254834) !?
so you do see Discrepancies between "Computer" vs ~setting~ Values.

Your old smartphone will be blazingly Fast w/ Precise Computed values:
will do several round trips from -49 to 69 Ev, w/o tiny Rounding Errors.



iphone-5 Off-Line Camera Simulator or Exposure Calculator, as long as,
you don't tap Blue-Keys as "Prev.Page", "Next.Page" to exit temporarily.
Memorised Results can be used back. - Click Image, Ctrl+ to Enlarge.

Short / Long-Exposure Computed examples

Samsung NX-mini has Class-Leading specs for Astro- or IR-photography.
4 minutes Exposure at f/5 works perfectly at a Noiseless ISO 400 setting.
Resolution of 20+ Mega-Pixel + Green Peak Quantum Efficiency of 84%.
Its Price is $100euro or even less and its IR-cut Filter is Easy to Remove.
Dxo=85 (CanG7x+SonyRx10²)/2 +2/3Ev w/o IRcut =135 rounded to 141.

M-42, M-43 nebulae, Orion Warrior -- this with my Selfie Camera
Astrophotography D.S.O. with the Samsung NX mini

Nikon D600, D610, D750 are very Good Tools for Astro-Photography too,
google/?q=Nikon-D600+D610+D750+Best+Tools+for+AstroPhotography
their imx128 Sony Exmor sensor is at its Best from ISO 100 up to ISO 400.

Clusters, M-42, M-43, NGC-1977 Running Man -- Sensor Comparison, Ranking

Orion examples Settings: 1 digital min. value's often 64 sec, Dxo ISO #s used.

the Pentax K-5 works in a totally opposite way than the Eos 20d and Eos 5d.
Long Exposures at base ISO-80 are 100% Noise-Free. Not even AmpGlow.

Clusters, M-42, M-43 and the nebulae around
Clusters, M-42, M-43, nebulae around
Pentax K-5 Galaxies, Nebulae
M-42, M-43, nebulae around : Orion, 1500 Light-Years away
Pentax K-5 Astrophotography -- The ISO-80 Marvel

Canon Eos since 2004 were 1st DSLR to output Top ISO 1600 sub-frames,
tests said my 2004 Eos 20d is ~1/3Ev less than 1600 sensitive: ISO-1270.
my 2006 Eos-5d is same ~1/3Ev below 1600, so I kept this real ISO-1270.

Canon Eos-20d, Eos-5d Astrophotography, Tests ISO-100 vs 1600
Clusters, M-42, M-43, the most parts of NGC-1977
Clusters, M-43, M-42, Running Man - NGC-1977
Clusters, M-42, M-43, some parts of Ngc-1977

Simulator, Calculator won't run from -49 to 69 Ev
- without a Full JavaScript featured Browser.
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