tmr design's posts about the alien bees has got me thinking.
i think the ab800 is a very awkward light for me.
in the studio (our living room), we always, without exception, have too much power!
i like to shoot from f/2.8 to f/8, to stay in my lenses' sweet spots.
as an example, here is a shot from my lighting test last night. shooting with the 85L my target aperture was f/4 at iso 50.
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the main light is an ab800, in a large octobox. the box is feathered to get a more short light and thus is also lighting the background. the front diffusion panel is removed. i believe this light was set to a hair under 1/16 power. meters at f/4. i would have preferred that this light meter at 3.2 or 3.5 but i was unable to get it any lower because of ratio to the fill light.
fill was an abr800 with moon unit. this was on the floor leaning against the base of the main light's stand. my target reading was f/2.8. with the power all the way down at 1/32 i was getting f/4. i put a shoot through umbrella over the moon unit, the shaft going through the hole in the ring. this cut 1.3 stops and i was at f/2.5 not what i wanted but not a huge problem either.
the kicker was an ab800 and 30 degree grid on a boom. the grid causes quite a bit of light loss and i believe i was at 1/8th power (EDIT - just checked and wrong - it was at 1/32) and getting f/2.8.
the light together metered at f/4.5.
i work almost exclusively in the 1/8 - 1/32 range. those familiar with the controls know that it is basically luck if you are able to make say a 1/3 stop adjustment in that range on the first try. the analog non linear slider is not very accurate. this can be very frustrating. as i refine my tastes in lighting i am beginning to understand the value of accurate fine tuning. i waste a lot of time guessing about power.
i made this work, but it would have been much simpler to either have less power to work with and be working in the easier to control range or to have digital control available to precisely dial in the power. both would be great.
i could have lost three stops and been fine. really i could have lost 5 and been fine, shooting at iso 200. i think i could really only give up two, in case i want to shoot at f/8.
two stops is what, an 80 watt second strobe?
what's more, outdoors, in direct sun with diffusion it's really not bright enough either.
maybe for one person if you can get the light in very close but not for a small group. as far as i can figure it you need around 1200 watt seconds to comfortably beat the direct sun at a reasonable distance for shooting groups with diffusion. which is the situation i need the most power.
so really the advice of you can always turn it down and you'll be glad you have the extra power when you need it are both incorrect - for me.
i am curious if anyone sees any holes in my reasoning. because if i am going to make a move on replacing my lights with something better fitted for my style than i need to do it now.




