What size pinhole

[jason_hall5]

I have just purchased a set of 12 drilled pinholes. At the moment I have two projects to use them. One is a Polaroid

100 Automatic Land camera. As I recall the polaroid pack film folders are 117mm. The other project is a lens cap

pinhole for my various EOS bodies includeing film and digital.

 

My question is simple, what would be the best starting point to choose a pinhole size for each project. As I have

understood, the focal length determins much about the ideal aperture size. I just have no idea where to start. Ideas

on exposure would be great too. The digital is easy enough to play with and get right, put I don't want to burn through

a ton of film packs for the polaroid.

 

For what it is worth, I will be shooting either 100 ISO or 3200 ISO. Fuji of course....

 

Thanks in advance

 

Jason

[Dustin McAmera]

Have a look at <a href="http://www.pinhole.cz/en/pinholecameras/pinhole_01.html">this site</a> for the optimum pinhole size according to Rayleigh's formula. It also describes how to make your own pinholes. I've followed these instructions with some success. There's a link near the bottom to a page about exposure.

[jason_hall5]

Pete! Thats Great! thanks for making it easy for me....sorry I did not look hard enough apparently. Any way, wish I knew the reciprocity failure of Fuji FP3000B or FP100B. Either way this gets me pretty darn close.

 

Thanks

 

Jason

[jim_momary]

Jason, me boy ... ye must look harderer LOL ...for the 300 - ... http://www.fujifilmusa.com/shared/bin/fp3000b-ds.pdf .... and for the 100 - .... http://www.fujifilmusa.com/shared/bin/fp100b-ds.pdf ..... your friendly neighborhood snoopy man, Jim M.

[jim_momary]

and ..... LOL .... http://www.fujifilmusa.com/shared/bin/ProfessionalFilmDataGuide.pdf .... tada! :-)

[patrick j dempsey]

I was gonna suggest that too! It's a great little program and very useful for projects other than just pinholes. :)

[connealy]

I think I used this formula:

<br><br>

    <b>1/25 the square root of the distance between the pinhole aperture and the film

plane (focal length)</b>

<br><br>

If you start looking around the web, you'll find quite a few different answers. Luckily, the size of the hole

is only one small issue in making pinhole images.

<br><br>

You can see my results on <a href="http://mconnealy.com/pinhole/index.html" target="new">my

pinhole pages</a>, though they are not likely to correspond to yours as I am partial to much shorter

focal lengths.

[jim_graves1]

Where'd you find the pinhole assortment?

[jason_hall5]

I am so glad that I could you fellas a good laugh. I did not intend for anyone to look up the reciprocity failure info. In any case, as it turns out I had down loaded both of the PDF documents a while back but had forgotten about them. I found them with google back when I first started to use them in a Polaroid 250. I am now using the Zeiss viewfinder and the camera back on a 195 that I bought a while back. Anyway thanks again to everyone.

 

You are right Patrick, that small program will be very useful, and very much worth getting laughed at. :o)

 

To Jim Graves,

 

A dealer on E-bay sells them. I think he goes by "pinholebilly". Apparently he makes them himself. I bought them from him because I saved a few bucks doing so. I really don't know how accurate they are. But hey! I managed to find them on my own! :o)

 

Here is an on line dealer that seal a fair amount on Pinhole products. Yet another one I found all by my little lonesome self....

 

http://www.pinholeresource.com/shop/shop?page=shop.browse&category_id=16

 

Jason

[jason_hall5]

Mike, I am inspired by your images. I would have not have thought those were pinhole images at first glance. Well done.

[mark_hahn]

here was page from years ago:

 

http://www.geocities.com/markhahn2000/pinhole_concepts.html

 

here are some photos:

 

http://www.geocities.com/markhahn2000/minox_format_pinhole_photographs.html

http://www.geocities.com/markhahn2000/goodbye_conn.html

http://www.geocities.com/markhahn2000/a_couple_more_minox_ph.html

 

they were taken with this tiny little camera:

 

http://www.geocities.com/markhahn2000/minox_format_pinhole.html

 

hmmm... I think I have to play around with some of my pinhole camera again!

 

:)

[mark_hahn]

FWIW, when I have tried pinholes on my DSLRs the results kind of all sucked... can't explain it, but striking a sensor seems different than film...

[mark_hahn]

I think this was a nice cheap way in with some style:

 

http://www.geocities.com/markhahn2000/argus_a_p.html

 

have fun!!

[jason_hall5]

Thanks to everyone for the info. Mark, I will most likely have the same result as you in the long run with the Digital. But it is easy and I have the stuff to do it so why the heck not.

 

Any way, thanks again

 

Jason