DOF calculator

[Javelin]

Is there such a thing as a portable DOF calculator? maybe like a slide rule or circular calculator? actually what would be even better is a program that would run on my cell phone or something ... Casio should make a watch!

[Javelin]

that was very cool. i've never hooked up my phone to a PC before... now i'm on a mission to replace all the useless stuff that came with the phone

the other web site you gave me was great. one of the p[arts I make for my machines at work is a fancy anodized plate thats laser engraved I could make a bunch of these with some nice brass trimmings that would last forever. just got to figure out the scales

[Javelin]

holy .. cra.. man theres a whole world of little bits of software for phones ... who knew. theres editors , panorama makers library software all for your mobile phone ... is it 2008 already?!

[Javelin]

Thanks this will be of some help with the 100mm thats owning me. you don;t happen to know of one thats in imperial measure?

[David Kilpatrick]

Here's a link:

http://www.photo-software.com/

The Camera tool is pretty good and enables you to compare different digital formats rapidly. I will put putting a small review up about this, in connection with the benefits or otherwise of full frame DSLRs.

The Grey Card, which I see Douglas has now credited to our original research in the 1990s (we don't get royalties!), is the best on the market. Way back in 1996 when Shirley was completing her Masters degree in Colour Science, we found that the Kodak Grey Card had a strong magenta peak in its spectrum. Talking to Paterson Photographic, whose catalogues and advertising we handled at that time, we suggested that a folding grey card using new materials could be produced (using Ian Gee's principles for testing lighting contrast with a 90 degree folded card) - A5 to fit bags, plastic to write messages on like the Agfa Colour Test Target, and totally 'equi energy' in spectrum for both white and grey sides.

Douglas Green was talking to us about other projects and said he had sources for grey and white plastic sheeting, with many types of filler used. We put the two in touch, and agreed to do the research for a fee. Douglas sent us dozens of samples of the vinyls, and finally we got a mix which was totally equi-energy and free from spikes or pikes, for both white and grey. This plastic, unlike paints or inks - or the Kodak Grey Card! - gives perfect WB under any illuminant as it has no tendency to anomalous reflection. This became the Paterson Grey Card which he manufactured for them, with Shirley's technical notes and graphs of the spectrophotometer readings. Now it is also sold by Douglas directly.

David