RE: Pinhole and SLR

[hannu.jarventaus@xxxxxxxx]

>
>From: 	pbadcock@xxxxxxxxxxxxxxx[SMTP:pbadcock@xxxxxxxxxxxxxxx]
>Sent: 	29. toukokuu 1997 16:48
>To: 	infrared@xxxxx
>Subject: 	Pinhole and SLR
>
>Hi Hannu,
>         could you briefly describe how this works please?
>(converting an SLR to a pinhole). 
>I assume you remove totally the lens from the front.  Is it 
>something that can be achieved with any 35mm SLR camera?

The method is very simple.
You guessed right, the lens has to be removed.

Take one extra cap for the lens opening in the camera, and
make a 4-5 mm hole in the middle of it.
Then tape one piece of aluminium folio on the hole
and make a little pinhole in the folio.
I have seen some advertising of readymade pinholes,
maybe you could use one of these too.

Because the pinhole is very little the viewfinder image
is very dim, but in daylight you should be able to see something...

If you will use the cameras exposure metering, you have to
find out how your camera works with stopped down metering.

The exposure time can be very long, so you may have to give some
extra exposure (reciprocity error).

For the IR photographs you need some kind of red filter.

Hannu Jarventaus
Espoo, Finland

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