Re: Er...I'm a bit stuck!!

["Joe B." <joe-b@xxxxxxxxxxxx>]

At 03:50 PM 26/10/99 +0000, you wrote:
>Right
>Guys and girls
>I've got me film out the fridge, I've done battle with the changing 
>bag, under my bed clothes , at midnight, got me fingers hands all 
>sweaty and mangaged to get it in!!...The film that is.
>The wether looks good for the next day, My filter is on my
>old battered Olympus OM10, got me tripod.
>Oh dear, What ISO do I set it to,

Ideally an Olympus user could tell you this since the camera meters
sesitivity seems to very a bit between the different makes. If this was me
trying this out for the first time with no other information and using a
red 25a filter with Kodak High Spped Infrared filem, I would set the
cameras meter at 400 ISO and try to shoot each shot under and overexposed
by one stop also. 

>and how do
>I focus,  with out a little Ir bit on my lens?? 
>Help!!
>If anyone can , I'd be real chuffed!!
>Thanks for your time!!
>Dave Green
>Kew

You don't say what lens you are using. If it is a 50 or shorter, I wouldn't
worry about the exact focusing correction and instead just use the depth of
field markings to set the the focused area between the two markings for
(say) f11 but actually set the lens aperture at f16. This should easily
account for any slight focusing differences, and with a wide angle lens I
wouldn't even bother with that but just simply use the depth of field
markings as they are. With a tripod, which you mention having ready, you
should be able to use small apertures like that with the correspondingly
longer shutter speeds and I find cheating over the focusing in this way by
using the dof markings is a lot easier than actually trying to correct it
exactly. Obviously if you ant to use a wide aperture and throw the
background out of focus and have a key part of the subject critially
focused you can't do it this way!

JB

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