[pinhole-discussion] focal plane shutter theory (Slit Scan Shutters)

Murray had said I would like to understand (actually, analyze) the operation of a focal plane shutter, for the purpose of building one for sheet film. I want to get a grasp on calculating exposure duration as a function of slit width and linear speed, I guess (or direction to what I should be

[pinhole-discussion] More on Scanners...

See, I just knew that the twice-or-three-times-as-expensive Epsons would be suggested! Not that you're wrong about them, just that I am resource challenged at present... (What about Canonscan scanners? Anyone use 'em?) While pondering flatbed scanners that will also do 35mm transparencies, I

[pinhole-discussion] Epson Perfection 1250 Photo Flatbed Scanner

Anyone have any direct experience with an Epson Perfection 1250 Photo Flatbed Scanner? It comes with a 35mm Slide Adapter Unit which is basically a small handheld light source. (Sure, I'd like to get the Perfection 1650 Photo Scanner, but that's twice the cost. The 1250 is admittedly the low

[pinhole-discussion] Flashing with Bulbs

Mark Power (mpo...@coventry.ac.uk) asked about flashbulbs... 1. See http://www.flashbulbs.com/index.shtml (Cress Photo, THE WORLD'S LARGEST FLASHBULB DEALER and The Preeminent EXPERTS, according to them, located in New Jersey. 2. Mark said (of bulbs) Unfortunately, at least here in the UK,

[pinhole-discussion] WWPD Gallery On Line: Thanks!

Every time I hit the WWPD Gallery to see what's new, there are always a few more images that are absolutely amazing. Very, very well done! Thanks to all who organized and publicized, thanks to all who made and submitted great images, thanks for all who worked to do the excellent web site...

[pinhole-discussion] Thanks: Beginning Paper!

Big thanks to Guillermo, Jean, George and Richard for information and suggestions on getting started with paper! Regards, Michael Georgoff San Jose, CA

[pinhole-discussion] Beginning Paper?

Can anyone recommend a good printing paper to start with for paper negative work? I've only ever done pinhole onto negative film and had it lab processed. Any recommendations for a fast, easy to use beginner paper, and some clues for ASA speed of recommended papers? (And why are there no

[pinhole-discussion] Hardware or Art?

I found this somewhere a long time ago, figured it was appropriate now: This reminds me of a true story of a famous photographer, who was well known for his amazing portrait shots who was commissioned to photograph a famous newspaper reporter. The photographer took the reporter's portrait and

[pinhole-discussion] Pinhole Day

I nominate Lord Rayleigh's birthday, November 12, 1842. Michael Georgoff San Jose, CA

[pinhole-discussion] Dr. Scott Williams Coffee Developer

Regarding Coffee Developer, I did exchange email back in April with Dr. Scott Williams. It seemed pretty simple with Coffee, Baking Soda, and Potassium Hydroxide (added to pH 9.0). Being chemically clueless, I thought I'd ask him a few questions. Dr. Williams said: ... We used real potassium