"Also If I move the cam the Flashes move as well and could be imp't at
macro distances." Uh, oh! Remember thou the inverse square law.
Dr. Flash
On 7/15/2011 6:16 PM, usher99@xxxxxxx wrote:
> Dr Flash writes:
>
>>> But in the light of day and after the first cup of coffee and upon
> re-reading Mike's original note Dr. Flash notices that Mike said:
>>> "Plan to use cross polarization flash..."
>
>
>>> In other words, there are two flashes, they're already off the camera
> and they aren't moving even though the camera might be. As to my
> original>>response I say: Never mind... well, almost. The fact that
> the flashes are not moving minimizes the chance of TTL flash exposure
> variation from>>frame to frame. However, it still leaves the chance
> that the (now much more likely) constant exposure is still in error.
> After all, a TTL flash>>measurement is still a reflected light meter
> measurement which is only ever correct when reflected from a gray card.
> But, if the error is not>>large, it can be easily corrected in post
> after all the (constant) exposures are combined in the stacking.
>
>
> I had planned on two flashes --perhaps the T28 on single flash and a
> T32 just to balance the lighting and get more photons (pol on cam too
> of course) I have pol film for the flashes(--thanks Dean!!)) the
> sweet spot of the lens is f8 or so balancing dof and and diffraction,
> but I can use it
> wider as am bracketing anyway and that just might make the T28
> adequate---only a T22 with both lights on. That would tbe easier but
> may not be adequate. Dean says that with Xpol he puts two T32's on
> the Lepp II bracket to get enough umph, but he has to stop down more
> for dof.
>
> Thought to mount them on the Lepp II bracket as well but is is
> getting unwieldy with the tripod center column upside down and not
> much clearance.
> It is a very touchy rig despite the fancy shmancy tripod. Also If I
> move the cam the Flashes move as well and could be imp't at macro
> distances. I do have a Metz flash with an assortment of manual
> settings too but that is too heavy for the bracket. May focus bracket
> with the helicoid to avoid that , but that is not easy either w/o
> disturbing the subject. Perhap shoul dthink about that RRS geared
> macro rail gizmo (CFO cringes)
>
> I did a dry run sans flashes and I think it can be done but it takes
> a good while to set up. There may be an easier way.
>
> Thanks for thinking about this Chuck and Dr. Flash.
>
> Hopefully, high MAG Mike
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