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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--
DT
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