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05-05-2019, 07:49 AM   #1
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Join Date: May 2011
Location: Marseille Provence
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Posts: 140
Camera Simulator, Exposure Calculator : SLV -25 to 30 Ev mini.

.
Hi all !
I wrote this Utility SW first before year 2000 with Pascal language...
... then re-wrote it with Delphi & Kylix a few years later...
The 1st tool I install on all my computers !

I was waiting for every Browser to support the full JavaScript implementation...
- especially the Math.lib which is used for the calculations
... to share it with you ... I think it'll run since FF 44.x, IE 9.x or so ?

Camera Simulator, Exposure Calculator : SLV -25 to 30 Ev mini.

It's buit w/o Constant Values as dofmaster for ex., Everything is Calculated !
Except - of course - the Starting Values in the 12 photo scenes...
Photography is a strict framework inside which you can freely create whatever you dream ?...

As numerous Pentax cameras are ISOless : K5, K1, etc...
it may be useful to know - before going on site...
what you can easily or not, or can't do.

Another use could be to to Verify DxOmark assertions about in-camera ISO.
Fujifilm, Olympus, Pana tend to use way Overrated ISO Numbers !
This is totally ridiculous as it is stupidly for Marketing lie...

The Photo starting the P.2 review of the Pana S1r shows that :
- non dark sky + well lit right half of this picture taken at F/4 1/15 sec. ISO 5000
which exif datas compute to a 2.3 Ev Scene !
But it certainly is 5~6 Ev !!

Please, let me know if your ~ recent Browser couldn't run it, thanks !
Hope you'll enjoy it !

Camera Simulator, Exposure Calculator : SLV -25 to 30 Ev mini.

Notes :
Left~Right side : Decrease / Increase - Aperture, Shutter-Speed, ISO, SLV - Numbers !
– / + : Decrease / Increase - amount of Light on sensor and/or image Brightness
Calc.(ulate) : Aperture, ShutterSpeed, ISO, SLV from the 3 other values
- 12 Scenes Light Values to start with : from -6 Ev up to 16 Ev
this page won't run w/o a full JavaScript browser




Attached Images
 

Last edited by geo444; 05-05-2019 at 09:01 AM.
05-06-2019, 01:48 PM   #2
Senior Member




Join Date: May 2011
Location: Marseille Provence
Photos: Albums
Posts: 140
Original Poster
Camera Simulator, Exposure Calculator : SLV -25 to 30 Ev mini.

.
Wow !
250 Pentaxians... and not even a Crash ?... a simple Bug !?
I can't believe it !

This evening, I had time to add another " option select menu " for the Ev step :
- now, you can choose between 1 Ev, 1/2 Ev, 1/3 Ev...

Default is 1 Ev Step... would you prefer 1/3 Ev Step by default ?
... in case, I'll do it tomorrow evening...

Camera Simulator, Exposure Calculator : SLV -25 to 30 Ev mini.

QuoteOriginally posted by geo444 Quote
.
... Please, let me know if your ~ recent Browser couldn't run it, thanks...
.
Hem... finally...
I think I prefer you let me know when this Utility works fine with yer xxx Browser
Thanks !

Camera Simulator, Exposure Calculator : SLV -25 to 30 Ev mini.


Last edited by geo444; 05-06-2019 at 01:57 PM.
05-12-2019, 02:08 PM - 1 Like   #3
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Join Date: May 2011
Location: Marseille Provence
Photos: Albums
Posts: 140
Original Poster
Camera Simulator, Exposure Calculator, Scene Light Value -49 to 69 Ev-Lv.

.
In addition to the " Light Value " present in EXIF Datas,
this Utility SoftWare also Calculates the older " Exposure Value "
> just leave the ISO value unchanged at 100.

The 12 Action Links have been replaced by Buttons

The precision have been improved

The usable Range have been increased up to : -49 to 69 Ev-Lv

Camera Simulator, Exposure Calculator : SLV -49 to 69 Ev-Lv.

Left~Right side : Decrease / Increase Aperture, Shutter-Speed, ISO, SLV - Numbers

– / + : Decrease / Increase - amount of Light on sensor and/or image Brightness

Calc(ulate) : Aperture, ShutterSpeed, ISO, SLV from the 3 other values

3 Ev Steps: 1, 1/2, 1/3 --- 12 Scenes: Light Value –6 to 16 Ev-Lv

Camera Simulator, Exposure Calculator : SLV -49 to 69 Ev-Lv.


Last edited by geo444; 05-20-2019 at 12:52 PM.
05-20-2019, 12:58 PM   #4
Senior Member




Join Date: May 2011
Location: Marseille Provence
Photos: Albums
Posts: 140
Original Poster
Camera Simulator, Exposure Calculator, Light Value -49 to 69 Ev

.
Camera Simulator, Exposure Calculator, Light Value -49 to 69 Ev.

I try to make this Tool the fastest, the more practical possible :

- It only needs a tiny 568 x 320 pixel LCD, see illustration w/ iphone5...
... in order you could bring it everywhere with you...

- Once you've chosen an Ev-Step and a Starting Scenario... it Works Offline...
... in order you could use it everywhere...

+ 1/2 Ev Incr/Decrement Step has been replaced by 1/6 Ev more Practical, Useful...
...1/2 Ev = 3/6 or 1/3+1/6 Ev...

Camera Simulator, Exposure Calculator : Light Value -49 to 69 Ev

Notes :
'f/11' is f/11.3 - the number behind the label 'f/22' is f/23
calculation : f/4, f/8, f/16 x Square-Root of 2...
.

Attached Images
 

Last edited by geo444; 05-27-2019 at 01:31 PM.
05-22-2019, 11:21 AM   #5
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Join Date: May 2011
Location: Marseille Provence
Photos: Albums
Posts: 140
Original Poster
Get More Photons in ( very ) Low-Light conditions !

.
Now you have No excuse to persist using your Pentax as if it was an ordinary Canon Eos *1
at ISO 1600 and more on a Static Target. Everything's here to help you shoot at Base ISO :
www.pentaxforums.com/forums/115-pentax-k-5/143409-k-5-astrophotography-73.html

- My Utility SW to help you translate High ISO into "More Photons" Long Exposures !
...as Pentax K1, K5, don't fear (very) Long Exposures, even pushed +6 Ev
PK5Lv-5+6 Large Size - Astro - Photo Gallery - Cloudy Nights

- Astrams, if your EQ Mount gives pin point stars at 30 sec. it will hold 15 minutes...

- Guiding costs Nothing : I still use free PHD on my Win2k Acer TravelMate 270...
... trought my ToUcam Pcvc 740k mounted on the SW 9x50 finderscope !

- The comparative examples are Not from well selected pics shot for that cause...
...2011-04-04, 20:30, I was in a hurry to test my just received Pentax K5.
Standard glass 4 elements f/6.7 Refractor, 2004 HEQ5 Mount,
- I forgot to say Orion was very low over the horizon :
.
1120x1368 at 100% before pf.com resize down to 838x1024 pixel, right click to enlarge...

.
- 1st ISO 1600 sub shows an ugly white stain in place of M42 Trapezium :
... Dynamic Range falls from ~14 / 11 Ev down to ~9 / 6 Ev (according to DxO / P2P sites)
This is just ordinary ISO 1600 Highlight Clipping !
Photon law : you need ~60 subs to get a good pic at ISO 1600

- 2nd ISO 80 sub despite the basic refractor that severely inflates bright stars...
...+ the poor precision of my 2004 HEQ5 that blurs the small stars,
the 3 ISO 80 shots are Perfect, No Noise, No Amp Glow
my very firsts more than 3.5 minutes subs

- DSS settings : Bilinear interpolation of the 3 ISO 80 PEF files
No Dark-Frames, No Bias-Maps (offsets) used...
Detection Threshold 4 or 5 %, Black Point set to Zero...
that could well be standard settings...

- DSS had no problems to stack these 3 subs into a good picture !
if only bright stars were not inflated to this point !
I bet everyone achieves a better test...

it's your turn now...

*1 : Canon Eos, High ISO Champions, since at least 1D Mk II & 20D
... but unable to deliver a Base ISO picture in Low-Light w/o Banding Noise !
EOS 20D = Astro Test ; ISO 100 vs ISO 1600 ; 30 seconds

PS : comment from my album,
Get More Photons in Low-Light : 1st Astrams used their Eos at ISO 1600 due to Huge Read Noise +Banding at Base ISO. Despite K1, K5 at their Best at Base ISO, Pentaxians tend to persist using their K1, K5 at High ISO in Low-Light, Astro. High ISO, a bad habit, you cripple the very good performances of Pentax. ISO 1600, you mainly collect Noise, so you'll need 60 subs to equal ISO 80 quality +Dark-Frames +Bias-Maps if Hot Pixels, Amp Glow... ISO 80, 3 subs at the very Best Quality, that's it - Less ISO = More Photons !
.

Last edited by geo444; 05-24-2019 at 10:53 PM.
09-22-2020, 04:22 AM   #6
Senior Member




Join Date: May 2011
Location: Marseille Provence
Photos: Albums
Posts: 140
Original Poster
Camera Simulator, Exposure Calculator, Light Value -49 to 69 Ev.

.
Camera Simulator, Exposure Calculator, Light Value -49 to 69 Ev.

Last spring...
I added three Control-Dials and one Lighting-Dimmer pictures
to say the most with the fewest words.

These days...
I added a link to the Fantastic Job done by Wayne Fulton :
- he filled the whole list from Precise Values to Nominal Values
for Shutter-Speeds, F/stops and ISO values...
= in Full, Half, Third, Third+Half, Sixth, Tenth stops...
with up to Nine Significant Digits !
Thanks to Wayne Fulton
.
On page How To :
Left / right key : Decrease / Increase Aperture, Shutter-Speed, ISO, SLV - Numbers
– / + : Decrease / Increase - amount of Light on sensor and/or image Brightness
Calc(ulate) : Aperture, ShutterSpeed, ISO, SLV from the 3 other values
3 Ev Steps: 1, 1/3, 1/6 - 12 Scenes: Light Value –6 Ev to 16 Ev
for 1/2 Ev increment, shift 3/6 Ev equivalent increment
This won't run w/o a Full JavaScript Browser
from Precise-Values to Nominal ones
- link to Wayne Fulton's page
.
Camera Simulator, Exposure Calculator, Light Value -49 to 69 Ev.
.
3 Control-Dials + 1 Lighting-Dimmer added :
Attached Images
 

Last edited by geo444; 09-30-2020 at 11:24 PM.
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