Amazon ad for Mathcad

[Ninetrees]

I was browsing Amazon for a Depth of Field calculator (photography) and up popped

www.ptc.com/go/buymathcad/ - Mathcad 14.0 with advanced features Solution to scientific computations

Wonder if that works on my PalmPilot, or if I must carry my laptop to calculate DoF in Mathcad? 😉

Rich
http://www.downeastengineering.com/

[ptc-1214470]

Here is a small hyperfocal distance calculation I have used for years - don't know how it would do on a palm pilot..
Jim S.

[Ninetrees]

Thanks for that! I have been using /this/ worksheet because I am interested in focusing closer and knowing what my actual depth of field is wrt CoC.

The problem is that selecting a table of f-stop v focal length values is fine, but the object distance is an active variable for me. It constantly changes, and the DoF I am interested in is pretty shallow.

See
http://www.downeastengineering.com/public_images
for some examples (not the sunrise images).
# British Soldier Lichen.5.3072x2304~4.4MB.gif
# British Soldier Lichen.5.768.576.gif
# rosemary flowers double.2.gif

BTW, those big blue things are wild Maine blueberries, about 8-10mm in diameter.

There are a few Palm apps out there, but not as convenient for me because I am not as interested in the hyperfocal distance. (Yur program is still useful because I can print just the final table and view the PDF on my Palm.

Rich
http://www.downeastengineering.com/

[ptc-1214470]

Perhaps I don't understand; the worksheet I sent computes near and far acceptably in focus distances (p.n and p.f) as a function of lens focus distance setting, with circle-of-confusion, f/stop and lens focal length as parameters; isn't this what you are looking for?

Jim S.

[Ninetrees]

Oops, forgot the file...but I also wanted to say that this is an excellent example of why I want programmatic control over units. The DoF is strictly related to the object distance, and if /it/ is in mm then so should be the near and far DoF values. You there, Mona?

Rich
http://www.downeastengineering.com/