I tried a T20 in my 24" brolly box this morning and, at ISO 100 it
measures about f/13 at roughly 1/3 meter. Two of those would put you at
about f/18 or f/16 if you back off a bit. So I don't think there is
much of a problem in controlling the amount of light you need for your
macro work. But remember, you can't control the light with shutter
speed and (I don't think) your camera can go lower than ISO 100 so your
control options are moving the flashes toward or away from the subject
or adding more diffusion. Your larger brolly boxes will probably lose
more light but if they do you can just up the ISO dial a bit.
A single T32 at full power and ISO 100 in the small brolly box delivers
about f/8 or f/9 at about 2 meters. Adding a T20 will push that up
around f/11 which is a bit small for portraiture. Your larger brolly
boxes may help drop that down some but you may have to throttle that
back by moving the flashes back or perhaps running the T32 at 1/4 power
and use the T32 as fill and a T20 as the main. Moving the flashes back
is less desirable since soft light comes from having the light source
close to the subject... or a larger angular diameter from the subject's
view point.
Chuck Norcutt
On 10/7/2010 2:38 AM, Olaf Greve wrote:
> Hi Chuck (and others),
>
> Well, the "dirty deed" is done: I decided to not mess around with
> improvised (sometimes clumsy) diffusers, and to try these brolly
> boxes. As per what you said regarding the quantity: you're probably
> right in stating that 2 should be sufficient, so that's what I ordered
> (these items seem to be far from rare, and no additional discount or
> other direct benefit seems to come from ordering 3). I also ordered
> two of those swivel heads with the base plug. BTW: If I can judge the
> picture well, it seems to have a small metal insert with the base
> plug, clicked into a cold shoe.
> Many a moon ago, somewhere in 2000 I think it was, I also experimented
> a bit with the home made umbrella type set up. Then I didn't have
> proper mounting systems either, so I used a complex means of taping
> them to two tripods or so. I don't remember exactly, but I do remember
> that it took some effort to adjust them. Not handy.
> With the prices for the two brolly boxes (together some $33) and the
> two swivel heads (together some $14), for less than 50 bucks I should
> have a far nicer solution for that.... :P
>
> Alright then, let's give this a try when it's in. :)
> I don't know exactly how long the shipping will take, but hopefully it
> will be like the previously mentioned CD place, where it only took a
> few days.
>
> Then regardig the studio lights: your previous post, as well as what
> Wayne wrote, exposes several of the 'catches' in using those. I think
> it's best to try the flash set-up first, and if that really doesn't
> work in a satisfactory way (a thing I doubt) perhaps revisit the idea
> of giving them a try.
>
> BTW: A thing which I do remember from the "2000 set-up" to work quite
> well too, were to add in a few simple improvised reflectors. The sky's
> the limit for possibilities for those of course, but back then I just
> went to a store where all sorts of building material for home
> improvement etc. are being sold, and I bought a set of big white
> styrofoam (isolation material) plates. The set had some 6 of them.
> Well enough for the simple studio set-up.
>
> All of this is fun!
> I've been so out of touch (perhaps better said "out of love") with the
> whole photography hobby ever since the digital cameras really came
> through, so this may be a nice way of getting somewhat back into it
> again! :P
>
> Cheers,
> Olafo
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