Re: Pinhole Light Meter

Indeed, this is interesting. I have been doing a lot with pinhole seive
recently and have been thinking of moving from my 4X5 to using my 8X10 camera.
Of course, the cost of 8X10 panchromatic film (as opposed to orthochromatic
film) is always an issue, so I would see something like this to be very useful.
 Please keep us informed on this.

Cheers -

george

--- John Fletcher <jfl10593@bigpond.net.au> wrote:

> Hi
>
> I have been taking Pinhole Images with a Zero 2000 Pinhole Camera for
> about 7 years.
>
> To improve the exposure accuracy of my images I have created a prototype
> specialist Light Meter especially for my Pinhole cameras. One of its
> more unusual features, and the main one I wanted, is that it integrates
> or sums incident light over the exposure time. Thus a creating perfect
> exposures in variable lighting conditions (sunsets, clouds, multiple
> flashes, etc.) . The f/stops I use are f/45, f/48, f/55, f/128, f/138,
> f/158, f/176, f/216, f/235 but they are just programmed into the
> microcontroller. Film ISO/ASA rating (ISO 3 to 8000 in 1/3 stop
> increments). I user Fuji Provia F100 which appears to have negligible
> reprocity but that could easily be programmed in.
>
> It also functions as a Timer, Normal Light Meter and via its TTL output
> and a battery powered prototype Shutter Driver I created it can control
> shutters like the ILEX No 3. Synchro Electronic Shutter (which you can
> buy off eBay for US $20) or Melles Griot 04 IES 213. I currently use it
> with a heavily customised Zero 2000 Pinhole Camera and "UltraThin"
> Melles Griot 04 UTS 203 Electronic Shutter.
>
> Here are some pictures of the functioning prototype
> http://www.flickr.com/photos/92561604@N00/sets/72157594223607004/
>
> I'm kind of wondering if it's worth taking this project further, would
> anyone else want to use such a device?
>
> All the best
>
> John
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Received on Fri Aug 4 05:50:37 2006