Zippy,
I've always wanted to do that to a scanner, I lack the real motivation to follow it through. I know I'd get about as far as gaffer taping things together, and then dragging my desk closer to the window...

Thanks for the tip drill tip. I was just about a block away from a welding supply store the other day and I spaced it.

Filters wouldn't do much since the emulsion is essentially B&W. Or Brown, orange and white. The color is introduced in photoshop. Actually it is hard to decide on a color. They all look cool.

Day to Day changes
 

The biggest change in day-to-day position of the sun is around the equinox. The days are getting longer by twice as much now as they did at the beginning of January.

So to get the biggest change from one day to the next, do it in March.

It might also be interesting to do a run that ends at the equinox. I wonder if you would be able to see the difference increasing as it "accelerates".

I'll do that. luckily these are fast, cheap, and out of control.
Well, they aren't really all that fast.

Thanks for the tip.

Want a camera?

Filters wouldn't do much since the emulsion is essentially B&W. Or Brown, orange and white.

I am no expert but you can lighten and darken and do other things with BW film if you use a colored filter , Orange lightens the pic , light blue darkens it , red has an effect as well , look around on the web for BW film filter info . Just a thought .

Zippyt,
True. Most bw film is panchromatic,ie sensitive to all wavelengths or colors of light, falling off in sensitivity at the near infrared end. Some emulsions are hypersensitive to blue light or UV. Some films are more sensitive under incandescent. Tri-x for example, is rated at asa 400 but under incandescent light it is about 500 asa. There are IR films and some that are blue sensitive only. Using filters with these films changes the tonal relationship of the subjects by allowing more or less relative exposure to the subjects depending if they are similarly or differently colored than the filters. eg Red lightens red and darkens blue. Green lightens green and darkens red, etc.

The film for these cameras is actually Printing out paper (http://www.albumenworks.com/printing-out-paper.html)
it is sensitive to the blue end (UV) of the spectrum and is fairly insensitive at that. to make a contact print form a negative it needs about 2 minutes to 5 hours of exposure to direct sunlight. That is why it needs days or weeks in a pinhole camera.

So you could put a filter in front of the camera but two things would happen. First, most filter material inherently filters out UV light, so you would be cutting down your overall exposure. Second, since the emulsion is sensitive to blue light only, then any filter that cuts blue light (yellow, orange, red) would also only be reducing overall exposure, without lightening the reds, yellows and oranges since the film isn't sensitive to those colors anyway.

A filter that passed blue light (blue, violet, green) would still have an exposure limiting effect by virtue of the filter's density and inherent UV filtering and wouldn't lighten those areas relative to the other ones since the film is blind to anything but blue light.

Probably more than you wanted to know, and quite possibly some errors here. This is off the top of my head and I have been suffering a bit from CRAFT lately...

I'll dig around and see if I can find some of my bw filter experiments.

By ALL meens dig around for those pics !!!!!!

You covered what i was trying to express in my know just enough to know i don't know what i think i know but i get the concept sorta kinda way .

I got mine. :D I'll set it up Saturday.

two ideas
 

hey 3ft...

what about cutting a larger hole, say quarter sized, dime whatever, then covering that larger hole with some opaque material that is softer, like electrician's tape. then poking your hole in the tape with something smaller, like a needle. then you could make more than one try, you know, do-overs if it was not satisfactory. you could easily control the piercing with the softer material.

another idea. if you divided the can with a partition and made two separate image areas, could you do a stereoscopic pair of images? maybe just two cans lashed together.

I do like your images, they are very artistic. I would like to try this myself. at almost 48 deg lat we get considerable movement of the sun in the sky south to north in the springtime.

Actually, I am lazy. And yes, a variation of this is to use aluminum can material. There is a pinhole website where you can find the decimal inch diameter of sewing needles which are numbered.

Yes! I like that. I have a headache already from just picturing what that may look like. I have an old stereo viewer. I will have to make one, despite my lazyness.

Thanks! If you want a paint can, let me know. Or if you can make your own can, I'll send you some of the paper. Or you can follow the link to CAW.

Thanks, 3ft, I will rig up a can or two. I haven't done any research yet on how to setup the "canera", do you have any specifics? Drawings? Links?

Thanks in advance.

Since I'm in a valley I need some height, so the best solution is to duct tape it outside my home office window, which faces mostly southward. I just opened the window to check the ledge, now all I need is to find some duct tape.

Don't you have any left in your homeland security emergency kit?

Actually, I put it up an hour ago. I partially enclosed it in a box for a camera I bought and duct taped it outside the window. Considering the amount of sunshine being pumped into my office right now, I should get a great exposure 28 days from now on March 27th. The advantage of doing this in February is how easy it is to calculate 28 days. If it had been January I don't know how I would have coped. ;)

I taped my camera can in place on an upward angle on the window. Since I'm only opening it on Sundays, it has to be accessible but stationary so that the image doesn't move from Sunday to Sunday.

I just learned that I'm going to have to move out sometime in mid March but I'll see if i can get my now ex partner to keep up the tape on and off until the solstice. sigh

my 28 days are almost up. i have to box it up and send it back on the 17th. i can't wait to start seeing how all of these turn out.