Hola Carlos!
I'm interested to see your "long exposure" pictures. Can you show some?
Thanks.
----- Original Message -----
From: "Fernando Gonzalez Gentile" <fgnzalez@xxxxxxxxxxxxx>
To: <olympus@xxxxxxxxxx>
Sent: Wednesday, May 19, 2004 9:03 PM
Subject: [OM] Re: Long exposure capability of OM2n
> on 19/05/2004 05:17, Carlos J. Santisteban Salinas at cjss@xxxxxxxxxxxxx
> wrote:
>
> >> My observation is that with MC lenses, exposures are longer, contrary
to the
> >> belief that multicoated lenses transmit more light.
> For a moment I thought a red diode woud be less readable by the SBCs due
to
> the green coating of the MCs. A green one might be seen better. Of course
> this would be assuming that an MC lens works like a green filter,
nonsense.
> >
> > A possible reason would be the light scattering (?) caused by the higher
> > reflections on the SC glass -- *maybe* such a puntual light source is
> > somehow 'less detectable' than a slightly spreaded one.
> Let alone the G.Zuiko I have, it's very flare prone so light scattering
> might be also. I have some beautifully underexposed flared pictures. Wish
I
> could show you my latest.
> >
> > However, exposure variation from SC to MC, according to these tests, is
> > *negligible*: the higher difference in the same batch was 1/4th of a
stop,
> > and all the rest were around 1/6th of a stop -- the ISO speed of
different
> > batches of the *same* film may differ up to 1/3th of a stop, a higher
> > difference than all of Fernando's results.
> Yes they are.
> >
> > Most important, if the slides are coming back OK, just don't worry about
> > the meter ;-)
> >
> > Oh, a few words about reciprocity failure... this has a noticeable
effect
> > on 'classic' films (most B&W, for instance) although not that terrible.
But
> > several modern films (Kodak E200, Fuji Sensia 400) have almost *no*
> > reciprocity failure at all -- at least within exposure times up to a few
> > minutes, as the OM's can manage.
> Sometimes yes, sometimes no. IMHO, P100F behaves as you say, but a
difficult
> late night shot I did w/velvia 50 came out right @ +1.
> W/ Ektachrome 100, star trails come up very colorful on a black sky @ +2,
f
> 5.6.
> E200-135 can't be found here but I know this is why astrophotogs prefer
it,
> haven't tried Sensia400.
>
> My rules of thumb on compensation are for my OM2, might not be applicable
to
> the 2n.
>
> /F.
>
>
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