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[OM] Re: Long exposure capability of OM2n - last one.

Subject: [OM] Re: Long exposure capability of OM2n - last one.
From: Larry <halpert@xxxxxxxxxxxxx>
Date: Sat, 22 May 2004 22:53:40 -0400
My 2n has done exposures of over 10 mins. Love using it for the odd reciprocity 
effects.
Maybe it always had a defective shutoff LED or sumthin'.

Larry


Daniel Tan wrote:

> I just had a play with my 2n and it's consistently 2 minutes 35 seconds (5
> tests) no matter what iso speed is set. I'm probably asking what was asked
> earlier, but the max exposure on auto is supposed to be 120 seconds, yes?
>
> Daniel Tan
>
> >
> > Hi Fernando, Carlos and Andrew.
> >
> > My OM2n in question functions erratically during long exposure test (in
> > Auto, with lens cap, finder covered). There were times that it timed 3m15s
> > and sometimes only as short as 5 seconds,
> >
> > Now I know the correct time should be 3min15sec when exposed in total
> > darkness.
> >
> > Fernando is right I requested for a picture for me to see his long
> > exposure
> > shot.
> >
> > Many thanks!!!
> >
> > Dado
> >
> >
> > ----- Original Message -----
> > From: "Fernando Gonzalez Gentile" <fgnzalez@xxxxxxxxxxxxx>
> > To: <olympus@xxxxxxxxxx>
> > Sent: Saturday, May 22, 2004 5:34 AM
> > Subject: [OM] Re: Long exposure capability of OM2n - last one.
> >
> >
> >> on 21/05/2004 16:53, Carlos J. Santisteban Salinas at cjss@xxxxxxxxxxxxx
> >> wrote:
> >>
> >> > The 'plain' 2 max. exposure time depends on the ASA setting. I've
> >> tested
> >> > 33s @ 1600, a bit more than a minute @ 400 and well over 5 min @ 100,
> > IIRC
> >> > -- I don't want to burn a nice pair of 357s ;-)
> >> My red diode 1981 test showed these results:
> >> ASA 1600 @ f11
> >> 6.1 s.
> >> 6.1 s.
> >> 6.0 s.
> >> 6.2 s.
> >> 5.9 s.
> >> 6.1 s.
> >> ASA 800 @ f8
> >> 7.8 s.
> >> 7.7 s.
> >> 7.4 s.
> >> 7.9 s.
> >> 7.9 s.
> >> 7.7 s.
> >> ASA 400 f5.6
> >> 9.4 s.
> >> 9.2 s.
> >> 9.3 s.
> >> 9.9 s.
> >> 9.8 s.
> >> 9.9 s.
> >> ASA 200 @ f4
> >> 10.9 s.
> >> 10.9 s.
> >> 11.1 s.
> >> 11.3 s.
> >> 11.2 s.
> >> 11.3 s.
> >> ASA 100 @ f2.8
> >> 12.7 s.
> >> 12.7 s.
> >> 12.5 s.
> >> 12.7 s.
> >> 12.6 s.
> >> 12.7 s.
> >> ASA 50 @ f2
> >> 13.6 s.
> >> 13.5 s.
> >> 13.4 s.
> >> 13.7 s.
> >> 13.7 s.
> >> 13.8 s.
> >>
> >> >> 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.
> >> >
> >> > I don't think the coating would act like a filter. And, even if it
> > would,
> >> > don't forget that the typical green MC reflections come from the
> > *rejected*
> >> > light *over* the lens surface (not from the light *thru* the glass),
> > thus
> >> > in extreme cases it would act like a pinkish filter.
> >> This is the correct reasoning, you're right Carlos, of course.
> >>
> >> >> I have posted a Provia 100F w/o compensation of abot 4 minutes
> >> exposure
> > at
> >> >> TOPE Landmarks. Some opinions about color shift were posted there.
> >> >
> >> > I don't think a single scanned pic is a valid reference to evaluate
> >> > reciprocity failure.
> >> Neither do I. I mentioned it just as an isolated example for Dado to
> >> see,
> >> and because I learned quite a bit from what people gently commented.
> >>
> >> >> W/ Ektachrome 100, star trails come up very colorful on a black sky @
> > +2, f
> >> >> 5.6.
> >> >
> >> > Star images should be less affected by reciprocity failure, and
> > *accurate*
> >> > exposure calculation is quite difficult: the actual focal length
> >> *does*
> >> > matter here, not just f/stop, exposure time and film speed.
> >> I bet they are. This topic started a little thread w/another listee who
> > made
> >> beautiful 8+ hours exposures using an OM1n and fisheye or w/Tamron 17mm,
> >> about a year ago. I wanted to know how did he calculate exposure, but he
> >> didn't tell...
> >> Mine were w/21mmf3.5 @ 5.6 +2comp E100. Then, with the help of this
> >> list,
> > I
> >> measured how long exposure had been. Posted the result, must be
> >> somewhere
> >> here in my HD.
> >>
> >> > From: Andrew L Wendelborn <andrew@xxxxxxxxxxxxxxxxxx>
> >> >>
> >> >> Out of curiosity, I just tested a 2n. Body cap on, black bag over
> > viewfinder.
> >> >> Shutter closed at 3m20s. Will try the other 2n when its film is
> > finished.
> >> >
> >> > Mine did about 3 min. I've got another OM-2n (which badly needs a CLA)
> > that
> >> > closes at 3m23s.
> >> Well when I finish the loaded Velvia 50, I will test again my
> >> OM2_without
> >> LEDs_ until I have to install new pair of Renata/Varta ;))
> >>
> >> Regards,
> >>
> >> Fernando.
> >>
> >>
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> >>
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> >>
> >>
> >>
> >
> >
> >
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> >
> >
>
> --
> DT
>
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