I have even more good news. You do not have to use Olympus' cross filter to do
this. You can get sheets of polarizing material from Edmunds for <$20. I cut
them to the same size/shape as a T32 filter. Then using an ordinary polarizer on
your macro lens, point the camera at a mirror. Rotate the polarizer while
looking at the flash head with the custom polarizer film in place, when the
flash head turns black, your cross-polarized. You might want to mark the filter
for each lens/filter combination you 0 Keep in mind this REALLY reduces yer
effective ISO. Also, after so many flashes, the film lightens, and you have to
cut another piece. One of George Lepp's "Beyond the Basics" books describes how
to do this, using N*k*n kit, of course.
>>> "Giles" <cnocbui@xxxxxxxxx> 05/26/00 09:20am >>>
Do you want the good news or the bad news first?
Good news: Olympus makes a a cross polariser accessory for the T10 ring
flash specifically for photographing reflective surfaces. There is a
polarising filter over the flash and another for the lens. the light from
the flash gets polarised and the polarising filter over the lens blocks
reflections which will have a different polarisation. At least I think
thats how it must work.
So you need a T10 ring flash, the cross polarising attachment, a T power
control unit to power the flash, and a suitable macro lens such as the
80mm f4 or 38mm f2.8, oh and you will also need an auto bellows or 65-116
auto extension tube for the macro lenses.
Bad news: See list of equipment required. All such gear is hard to find
in Oz as OM gear is hideously expensive new so sales of such stuff was
probably always very low.
Didn't Denton have some example images of watches taken with the various
macro flashes? Did he have one with the cross polariser?
Giles
Mark Staiger wrote:
> something I need to do for my PhD. I would like to
> be able to photograph/video the surface of steel
> that is highly reflective, actually
> electro-polished. The area is about 6.7 mm wide
> and
> round. Can I use my oly gear to get an image of
>
> Any tips would be really appreciated,
>
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