Discussions (481)

YN460(-II) power calculator

view profile

dsvilko says:

I have posted this some time ago in the strobist group but have since revised it somewhat. Maybe this is a better place to post it.

I have seen that a lot of people (including myself) have a hard time making all the flash power / distance / f-stop / ISO calculations in their head so I have devised a simple 'calculator' that should help.
It is meant to be printed and glued to your flash, triggers or just carried in your pocket. Here it is:

You can also download a big version.
It's not meant to be more precise than 1 f-stop but it should give you a very good starting point. The flash power levels are given for 2 meter subject distance at ISO100. It is also assumed you can get away with a 1/250s sync-speed (if not, 1/200s should be close enough) - important only when also calculating the ambient exposure.
The chart can be used in a lot of different ways. I'll give just two examples:

Example 1:
You are shooting outside on a bright sunny day and would like to be able to get a deep blue, a bit underexposed sky by flashing the subject with a bare YN460-II at power level 6 (to get an near instant recycle). At what distance should you put your flash and what aperture should you use?
1) Set you camera at 1/250s, ISO100.
2) Find the symbol for the Sun. It is above f/11 - that's your starting point.
3) You want to underexpose the sky by one stop so hop one stop to the right - you are at f/16 so that's your aperture.
4) The power level 6 (what you want) @2m distance would require the f/11 aperture (the aperture above the white '6' in the last row). As you want to shoot at f/16 you need to position the flash 1-stop closer than the default 2m:
5) Look at the small scale that goes from -4 to +7 and locate the -1 (stop). You have to put your flash at 1.4m.
That's it!

Example 2:
You are shooting sports with your 70-200 f/4 lens and the YN460. You would like to light a subject 15m away at f/4 and power level 6.
1) The closes 'full f-stop distance' would be 16m so locate the number 16 on the main scale.
2) Look up the small number below it. It says +6 ( as in +6 stops more distant subject than the starting pont of 2m).
3) The fastest your lens can go is f/4 so you look up the basic power level below the f/4 mark - it's 4 (blue is for YN460 mkI).
4) You know you need to now gain +6 stops. You can gain +2 stops by going to the target power level 6 but that's it. You are still +4 stops short,
5) Look at the ISO scale and find the ISO that matches +4 - it's ISO1600. That's it! You shoot at power 6, f/4, ISO1600, 16m distance.
6:51AM, 1 September 2010 PDT (permalink)

view photostream

*haibar says:

I tried using it a few time. Its very useful, thank you for sharing. You could also try to post it in the Yongnuo group: www.flickr.com/groups/yongnuo/
Originally posted 56 months ago. (permalink)
*haibar edited this topic 56 months ago.

view photostream

DokH says:

Can this be adapted to YN-560?
54 months ago (permalink)

view photostream

qualityandme says:

is there a version for other speedlights? I have an SB600 and SB 900.

I'm pretty new to all this, so if it's an inappropriate question, please let me know.
54 months ago (permalink)

Would you like to comment?

Sign up for a free account, or sign in (if you're already a member).