Shutter Speed Testing (was Re: [LargeFormat] rest)

[philip Lambert]

The new Copal shutters are v accurate except 1/500 is slow. The older
SynchroCompurs are less accurate, but most are within 1/3 of a stop. 1/500
is invariably slow.  Some speeds are actually shorter than they should be by
1/3 to 1/2stop but overexposure is more common.  I am sticking a correction
strip on the lens boards. For  negative film slight overexposure doesn't
bother me but I would like to get transparencies accurately exposed. Can
anyone tell me how to test my CdS lightmeter's accuracy?  Meter off a white
surface and compare it with my Nikon? Bracket exposures in half-stops?
Philip
----- Original Message -----
From: "Karl Wolz" <wolzphoto@worldnet.att.net>
To: <largeformat@f32.net>
Sent: Tuesday, February 06, 2001 8:43 PM
Subject: Re: Shutter Speed Testing (was Re: [LargeFormat] rest)


> How much error was typical?  Any trends, brand by brand, or size?
>
> Karl Wolz
>
> ----- Original Message -----
> From: "philip Lambert" <philip.lambert@virgin.net>
> To: <largeformat@f32.net>
> Sent: Tuesday, February 06, 2001 1:22 PM
> Subject: Re: Shutter Speed Testing (was Re: [LargeFormat] rest)
>
>
> > Subject: Re: Shutter speed Testing
> > Thanks to everybody who answered for your help. I received the shutter
> speed
> > tester today and have spent hours testing lenses and printing a
correction
> > strip for each lens board. If the error is less than 1/3 stop I ignore
> > it.... Thanks again  Philip
> >
> >
> >
> > ( shutter tester number is AA8075 and it retails for
> > > $79.99 in the USA - > Here is the URL for the tester:
> > >
> > >
> >
>
http://www.calumetphoto.com/calumet/ProdSearch.taf?_function=detail&qryItem_
> > Copy_Parent_uid1=AA8075&type=SPDSEARCH
> > >
> > >
> > > All the best,
> > >                  Clive   http://www.f32.net
> > >                          Large Format Travel and Stock Photography
> > >
> >
> >
> >
> > _______________________________________________
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> > LargeFormat@f32.net
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> >
>
>
>
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