Peter Leyssens wrote:
>
> I just wanted to elaborate a bit more on my self-made pinhole-body-cover
> for OM-mount. Kennedy reacted that I was crazy to waste a body cover on
> it. It has advantages : you can screw it on whenever you like and it's
> more or less guaranteed to be light-sealed. Also, this construction is
> more sturdy than any cardboard construction. You just screw on a lens
> cover and it's pretty safe, even to put it in your pocket.
>
> Exposure times are quite easy to calculate. My 'lens' is f500. Say,
> f512. This is exactly 10 stops away from f16. 10 stops = factor 1024,
> say factor 1000. So I take my 50mm/f1.8, I measure the light at f16 and
> I get for example 1 second. Multiply by 1000 and this is about 17
> minutes.
>
> Two remarks :
> 1) I can use my 50mm to measure the light because the pinhole is about
> 50mm away from the film plane. *Very* handy, this one.
> 2) I know the Schwartschild reprocity failure, so I exposed my first
> roll of HP5 with 3 times the exposure that I calculated. This turned
> out to be overexposed by, I estimate, 1 or 2 stops. I think HP5 is
> rather imune to reciprocity failure. Now I'm exposing at exactly the
> times I calculate and we'll see what we get.
>
> So, pinhole photography is now compact, OM-compatible and it's easy to
> calculate your exposure ! No reason not to do it anymore !
>
> The only hard part in making the pinhole-body-cover is to get a hole
> that is small enough. I had my aluminum plate perforated by a
> specialised tool maker with something like an electron canon (that
> presumedly blows away the atoms !). I didn't even pay for it, a friend
> of mine blackmailed the guys :-) *hm*. Must be Belgium.
>
> If I get around to scan some nicer pics, I could send them to the Oly
> gallery.
Peter,
Thanks for posting the details! I am very interested and have tried
to use pinhole photography with OM cameras before without much
success. perhaps my pinhole was too large in diameter?
I tried to drill a hole in the center of an aluminum can and
fit that to an OM2S.
So you used a black plastic body cap? How did you attach the
aluminum piece to the plastic body cap?
What is the focal length? Is it wide angle? Have you been able
to take the sort of picture where moving objects are invisible?
Are the images fuzzy??
I can't wait to see your photos on the new Gallery!
Hank Hogan <flzhgn@xxxxxxxxxxxxx>
> --
> Peter Leyssens
> Eonic Systems
>
> Support mail : support@xxxxxxxxx
>
> < This message was delivered via the Olympus Mailing List >
> < For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
> < Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
--
Hank Hogan --
BTW, I'm looking for a job as a biological science research
technician. If you know of anyone who might need a technician
with my skills (see resume on my home page) please let me know.
--
Thomas ?Hank? Hogan
Biologist, Photographer, Web Designer
mailto:flzhgn@xxxxxxxxxxxxx
http://www.netcom.com/~flzhgn/indexc.htm
< This message was delivered via the Olympus Mailing List >
< For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
< Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
|