Pinhole exposure

[Ducky]

I figured out the sunny 16 rule on my unmetered RF pretty quickly. With forgiving film and some recorded exposures I got the hang of it.
Pinhole exposure is driving me nuts. I get under/over exposed shots with nothing in between. I'll stick with it, of course, but what advice (reasonable, pinhole, advice) can you folks offer?

 

[ibcrewin]

Are you using paper negatives or film? There's a pinhole f stop calculator somewhere online that will get you in the ballpark.

 

[oftheherd]

When you photograph, you should be exposing in multiples of double or half your exposure (or aperture, but that is fixed with pinhole). Are you doing that? It should not take you long to figure out what the exposure time is. You can then figure your aperture if you don't already know. Do you also know your aperture? Are you using a light meter or just sunny 16?

 

[Mablo]

You need to know the diameter of your pinhole and a rough estimate of the focal length of your pinhole camera. Then you can use this calculator: http://mrpinhole.com/flvsdiam.php

If you don't know the pinhole diameter one trick is to scan the pinhole and measure the diameter using Photoshop or equivalent software.

 

[Ducky]

Some very helpful answers, thanks. I will have to get some more data on the camera, (homemade holga conversion, waiting on a Zero Image). It is an interesting process and I'm looking forward to mastering it.
No light meter, using 120/6x6 film. The Zero Image will be using the same film.
I'll have some photo paper I'll fool with later.
It's something to do on these cold Texas days.