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PostPosted: Sun Mar 09, 2014 7:13 pm 
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Joined: Thu Jun 07, 2012 5:39 pm
Posts: 2
To All:
I searched the web and could not locate a simple DSLR Shutter Speed To Decimal Conversion Table,
but I did find out that there are sure quite a few DSLR user's that are looking for such a table.
So i've decided to take on the task for all DSLR user's that might want a handy conversion table,
I will keep it in text format for public domain and that means no ad's or copy bs, if that's treading
into anyone's sacred ground, just let me know. Below is the table i've come up with so far, I would
appreciate it if you would mind taking a look at it and let me know if there are any errors and any
suggestions for improvement will be highly appreciated and used. Now here is the one area i'm
lacking knowledge in, what are the formula's for figuring Canon's and Nikon's Actual Shutter Speed
to decimal values, it would be nice to include those value's in the table. Thank's in Advance, flixxtez..
FYI: Since there is no way to build a proper text table, the dashes (-) are the column separators, the
first value is the shutter speed --------------------- decimal value, best I can get, out of this.
DSLR Camera Shutter Speed Equals Time Value:
----------------------------------------------------------------------------------------------
Shutter Speed ---------------- Decimal Value------------------- Canon Acutal Delay--------------------Nikon Acutal Delay
60" ----------------------------------- 60
30" ----------------------------------- 30
25" ----------------------------------- 25
20" ----------------------------------- 20
13" ----------------------------------- 13
10" ----------------------------------- 10
8" ----------------------------------- 8
6" ----------------------------------- 6
5" ----------------------------------- 5
4" ----------------------------------- 4
3"-2 ----------------------------------- 3.2
2"-5 ----------------------------------- 2.5
2"-0 ----------------------------------- 2
1"-6 ----------------------------------- 1.62996
1"-3 ----------------------------------- 1.31498
1"-0 ----------------------------------- 1.0
0"-8 ----------------------------------- 0.79371
0"-6 ----------------------------------- 0.62996
0"-5 ----------------------------------- 0.5
0"-4 ----------------------------------- 0.39685
0"-3 ----------------------------------- 0.31498
1/4 ----------------------------------- 0.25
1/5 ----------------------------------- 0.2
1/6 ----------------------------------- 0.166
1/8 ----------------------------------- 0.125
1/10 ----------------------------------- 0.1
1/13 ----------------------------------- 0.0769
1/15 ----------------------------------- 0.0666
1/20 ----------------------------------- 0.05
1/25 ----------------------------------- 0.04
1/30 ----------------------------------- 0.0333
1/40 ----------------------------------- 0.025
1/50 ----------------------------------- 0.02
1/60 ----------------------------------- 0.0166
1/80 ----------------------------------- 0.0125
1/90 ----------------------------------- 0.0111
1/100 ----------------------------------- 0.01
1/125 ----------------------------------- 0.008
1/160 ----------------------------------- 0.00625
1/200 ----------------------------------- 0.005
1/250 ----------------------------------- 0.004
1/320 ----------------------------------- 0.003125
1/400 ----------------------------------- 0.0025
1/500 ----------------------------------- 0.002
1/640 ----------------------------------- 0.0015625
1/800 ----------------------------------- 0.00125
1/1000 ----------------------------------- 0.001
1/1250 ----------------------------------- 0.0008
1/1600 ----------------------------------- 0.000625
1/2000 ----------------------------------- 0.0005
1/2500 ----------------------------------- 0.0004
1/3200 ----------------------------------- 0.0003125
1/4000 ----------------------------------- 0.00025
1/8000 ----------------------------------- 0.000125
----------------------------------------------------------------------------------------------


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PostPosted: Mon Mar 10, 2014 3:45 am 
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Joined: Tue Oct 26, 2010 8:22 pm
Posts: 498
Location: 1 AU from the nearest star
The way I look at shutter speed is two fold.
1) Am I trying to freeze action (fast) or create a blured motion (slow)?
2) Do I need more light (fast) or less light (slow)?
Both ways I look at speed is relative to other speed settings. I will often take a picture, and then adjust some setting until I get what I want.

Unless you need high precision speed of the shutter, I am not sure as to why you would need a chart to give you a decimal value of the speed.

While the thought of having such a chart is interesting from a purely academic point of view; I cannot think of a use for one. Can you provide a use case?

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PostPosted: Mon Mar 10, 2014 10:12 am 
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Joined: Mon Sep 13, 2010 7:01 pm
Posts: 1228
Location: NW England
^^^^^ As above.

Quote:
....but I did find out that there are sure quite a few DSLR user's that are looking for such a table.

Who? Where? Why?

Also, what are the other column headers for; `Canon/Nkon Acutal (actual?) Delay` :?

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PostPosted: Mon Mar 10, 2014 10:15 am 
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Joined: Tue Jan 04, 2011 7:58 pm
Posts: 817
Location: United Kingdom
As above.

Why would Canikon wilfully have a disparity in shutter speed? What purpose would it serve?

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Lenses: Canon EF-S 15-85mm f/3.5-5.6 IS USM, EF 50mm f/1.8 II, EF 100-400mm f/4.5-5.6L IS USM

CSCs: Panasonic DMC-GF3
Lenses: Panasonic Lumix G 14-42mm f/3.5-5.6


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PostPosted: Mon Mar 10, 2014 2:19 pm 
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Joined: Fri Aug 01, 2008 8:27 am
Posts: 528
Location: Hanoi, Vietnam
I'm not really sure why you want/need to have this table.

If my camera's shutter speed is not accurate or is uncalibrated, I use exposure compensation and forget about it. After all, ISO is not consistent between brands/models, but correctly exposing images is never a problem.

However, I'm not sure that is what you're trying to measure/compensate for.

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