What do ND filters have to do with my Bulgaria photos?
Cheers,
Nathan
> On 16 March 2018 at 10:32 John Hudson <OM4T@xxxxxxxxxxx> wrote:
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> On 2018-03-15 6:13 PM, Jan Steinman via olympus wrote:
> >> From: Moose <olymoose@xxxxxxxxx>
> >>
> >> On 3/13/2018 1:35 PM, John Hudson wrote:
> >>> Are there any opinions about the use of variable neutral density filters,
> >> I read all that stuff, and bought a Hoya variable, so it is probably true
> >> that it was the apparent sweet spot between
> >> quality and cost in my reading of reviews. I also have fixed NDs in a
> >> couple of sizes and densities.
> >>
> >> I have them to allow me to retain all the aberrations of my old/fast/weird
> >> MF lenses by keeping them wide open without
> >> astronomical/impossible shutter speeds, so qualities such as perfect glass
> >> aren't a big deal to me.
> > I use two thin polarizers stacked. Rotate one to get variable neutral
> > density.
>
> That works by rotating two circular polarizers when their forward
> looking surfaces are facing each other. One filter can be screwed on to
> the lens but unless the second filter has a male thread on each side of
> the optical surfaces the second filter cannot be attached to the first
> one to achieve the desired effect. Attaching one filter to the other so
> that both forward looking surfaces are parallel to each other generates,
> with CPols I have, a colour shift ranging from a bright rosy pink to a
> cyan / blue across the entire image.
>
> Perhaps your idea might work if one was to combine one CPol and one
> LPol, or two LPols, and screw them together so that their forward
> looking surfaces were parallel to each other. Unfortunately I do not
> have a LPol with me to experiment :-(
>
> jh
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> jh
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> > Jan
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