Support our Sponsors, they keep FADU free:   AG Photographic   The Imaging Warehouse   Process Supplies   RH Designs   Second-hand Darkroom Supplies  

Notices

Go Back   Film and Darkroom User > Equipment > Cameras - Pinhole

  ***   Click here for the FADU 2015/2014 Yearbooks   ***

Reply
 
Thread Tools Search this Thread Display Modes
  #31  
Old 8th September 2013, 02:14 PM
JOReynolds JOReynolds is offline
Friend
 
Join Date: Nov 2012
Location: St Albans UK/Agde France
Posts: 1,074
Default

I made a batch of halfplate cardboard pinhole cameras for my childrens' school 25 years ago. My (dress-rehearsal) attempts at reversal processing were not successful, so we made single-weight paper negatives, then contact prints. I found that the low contrast and fuzzyness arose from the piercing of the aluminium foil we used to fabricate the pinhole because the needle formed a tunnel with a reflective bore. We found it better to pierce a small X with a scalpel and, through a magnifier, fold four foil flaps away from the hole. Etching copper shim would probably work better. We found that a 0.8mm hole (an 'aperture' of about f/128 or f/180) gives the best compromise between sharpness and exposure time. Using this aperture with medium format might show excessive diffraction.
The long exposures showed only the vehicles that parked on the double yellow lines. But we couldn't read the number plate!
Reply With Quote
  #32  
Old 5th February 2017, 01:53 PM
Martyn L Martyn L is offline
Friend
 
Join Date: Jan 2017
Location: Bridgwater Somerset
Posts: 23
Default

I made three of varying focal lengths using 5x4 backs.
A 133mm 221mm and a 70mm.
__________________
aut viam inveniam aut faciam : Web mylaceyphoto.co.uk
Blog
mylaceyphotography.wordpress.com
Reply With Quote
Reply
Support our Sponsors, they keep FADU free:   AG Photographic   The Imaging Warehouse   Process Supplies   RH Designs   Second-hand Darkroom Supplies  

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Another pinhole camera - Stenoflex Michael Photography in general 9 21st December 2011 05:51 PM
Finney Pinhole Camera CarlRadford Sale or Wanted 2 12th October 2011 04:30 PM
egg pinhole camera Ian Marsh Photography in general 1 26th April 2011 08:22 PM
Zen Pinhole Camera cliveh Members Announcements 0 12th January 2011 09:43 PM
Pinhole Camera Viewing Frame Andrew Bartram Equipment miscellaneous 8 26th January 2009 05:21 PM


All times are GMT. The time now is 08:33 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.