Go Back   Steve's Digicams Forums > Digital SLR and Interchangeable Lens Cameras > Olympus Micro Four Thirds

Reply
 
Thread Tools Search this Thread
Old Nov 17, 2012, 1:06 AM   #1
Member
 
Join Date: Jul 2011
Posts: 32
Default Pinwide pinhole photo

Here is a pinhole macro. For those of you who are unfamiliar with pinhole photography here is a little primer. The lens is replaced with a device that has only a pinhole to admit light. There is no lens at all. Pinhole photos have infinite depth of field, but the images have a soft appearance at all distances. The effective f stop is over 100, which means lots of light, high ISOs, or long exposures. Or all of the above.

In this case I used the EPL-1s onboard flash to trigger a slave flash that was just a few inches away from the flower. The flower was actually touching the camera. This particular pinhole has a focal length of 11mm. Even with the flash very near the flower I still needed to use an ISO of 800 to get a usable image.
Attached Images
 
D B Cooper is offline   Reply With Quote
Sponsored Links
Old Nov 17, 2012, 11:31 AM   #2
Senior Member
 
boBBrennan's Avatar
 
Join Date: Aug 2005
Location: Arlington, Texas USA
Posts: 3,565
Default

...hey DB, that's a good PH image.

I've seen lots of pin-hole images and always when I do think I make a body-cap PH and try it. I have no idea of the hole size so would need to research for that. Then I usually forget about it until I see another image, so chance is I will never attempt it but always it is fun to think I might.

What did you use for the pinhole to make this image?
__________________
.
boBBrennan .. FB=> http://tinyurl.com/dxlwxfz

.......he likes Olympus, Apple MAC & SmugMug best of the choices; he likes that he has choices

boBBrennan.smugmug.com
boBBrennan is offline   Reply With Quote
Old Nov 17, 2012, 5:37 PM   #3
Member
 
Join Date: Jul 2011
Posts: 32
Default

For $38 you can get a Wanderlust Pinwide device from Amazon that is specifically for MFT. It is basically a lens cap with a recessed center to give the short fl. It has a precision made pinhole that is optimized for that fl. SLR Magic has a similar device that has a 24mm focal length. It is way worth the $37 to have a sturdy well designed pinhole device.
Attached Images
  
D B Cooper is offline   Reply With Quote
Old Nov 19, 2012, 11:04 PM   #4
Senior Member
 
Join Date: Sep 2010
Location: oakville, on
Posts: 491
Default

If I remember correctly, using a number 18 sewing needle, through a brass shim, results in f128. Press the needle into the shim till you get a tiny bump on the other side. Flip the shim over and press till the bump is now on the other side. Do this a few times and then using very find sandpaper, sand down the bump, again flipping one side to the next.
I once converted an old fold-up camera to a pinhole lens, manual shutter. I shot onto b/w print paper and then contact printed those to get a positive. Wanting better results, I then took a Horseman 4x5, put on a Rodenstock enlarger lens, no shutter, and shot onto cibrachrome. Always thought it would be fun to try 16 x 20's but thankfully never got my hands on an old 16x20 camera.
KulaCube is offline   Reply With Quote
Old Nov 21, 2012, 2:19 PM   #5
Member
 
Join Date: Jul 2011
Posts: 32
Default

The ideal size of the pinhole is a function of the focal length. Too large an aperture gives a soft image for obvious reasons, but too small an aperture gives a soft image as well due to diffraction. The ideal size is the balance point between these factors, which varies depending on focal length. Here is a calculator for determining the ideal pinhole size:
http://www.mrpinhole.com/calcpinh.php
Remember longer focal lengths also require longer exposure times.

If you are determined to make your own this is a good place to start. Being a little lazy I opted for the Pinwide device, which is optimized for MFT.
D B Cooper is offline   Reply With Quote
 
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 2:38 AM.