Using Polaroid Image film
I plan to make a pinhole camera for pinhole day on sunday and would like to use some Polaroid Image cartridges that I found in my darkroom.
Those are 640 asa which will come in handy as the kids will have to pose .
Can someone give me an indication of the focal length that I need to use to make it wide angle? An aproximate pinhole diameter would also be welcome.
I have this hole filter set from Monochrom at my disposal:
Here are some sites with lots pinhole information
An online pinhole calculator can be found here; http://www.mrpinhole.com/
Depending on the size of the film carts you are using, you would want an effective focal length of 50 - 60 mm most likely. In simple terms, the measurment of the film's diagonal would give you the approximate "normal" focal length. Anything less will be wide angle.
A 60 mm FL would be a 0.327 mm hole, according to the above calculator.
Good morning Stefan,
Normal for that film is 118mm focal length using approx .46mm hole. One half normal for a wide angle would be a 60mm with a .34mm hole at f191. I think you could go as wide easily to 40mm with a .267mm hole at f150. Pinhole numbers are very flexible, so for fun don't get stressed about a exact sized hole.
Thanks already, and good afternoon here.
At the Edun site I found the diameter list of my pinholes set because I erased one of the indications.
Then by using Pinhole Designer ( http://www.pinhole.cz/en/pinholedesigner/ ) and a calculator I converted them to millimeters and made a little excel sheet with the focal lengths, f nrs and EV's for all 12 holes.
Over now to cardboard and duct tape...