6 x 9 Film Back convert to Pinhole?

[peter_kervarec]

<p>Hi Can anyone help with this? I am going to try and convert a 6 x 9 film back to a pinhole camera. I will make the housing, however am I wasting my time? I am not sure how far to put the pinhole from the film plane for an approximate 24mm (35mm) focal length. Would there be light fall off at the edges of the film? Does the pinhole size affect exposure time only? Will I get an acceptable result ?<br>

Thanks</p>

[andylynn]

<p>There was a relevent thread a couple days ago: http://www.photo.net/alternative-cameras-forum/00UUGG?unified_p=1</p>

<p>Basically, the distance from film plane to pinhole is the focal length, and the conversion factor for 35mm to 6x9 is 2.5 so make the pinhole 60mm away from the film. Use the web sites linked in the other thread to figure out the size of the hole and appropriate exposure information and make sure to keep the dark slide in the film back until ready to take the photo :)</p>

<p>Seems like a pretty cool idea.</p>

[andylynn]

<p>I just had another idea. Put the pihole on a bellows and make a pinhole zoom lens!</p>

[ric_johnson1]

<p>You should be able to anything you, but for real pinhole info checkout <a href="http://www.f295.org">www.f295.org</a> and you will get more info then you thought possible.</p>