DAVE...................... > ".....A LITTLE knowledge is a dangerous > thing........." > > Sure I checked google>pinhole theory>photography........after 27 Years as a Professional Photographer I thought I might have forgotten something.......Ya-know-Dekol-on-the-brain!...........and every article dismisses your claims.............See Fig. 1.1 at > > http://www.pinholeresource.com/pinhole.html > > " This may be because you are accustomed to seeing > horrible results from badly out of focus pinholes." > > NOT SO.........A pinhole cannot be focused > .....SHARPNESS is a factor of the size of the > pinhole > as it relates to the Focal Length........THAT IS > WHAT YOUR REFERENCED CHART IS ALL ABOUT (taken out of > context from RESOURCES) > " http://www.stanford.edu/~cpatton/ip-ph.html " > > > "..... Light rays are not focused to a point but > bundled, in parallel, into beams."............ > > And just WHAT phenomenon "bundles" the light ? > > > "This is about all I remember from high > school......" > > Time to go back..............The Focal LENGTH is > directly related to the DISTANCE between the pinhole > and the film plane.........the greater the distance > the longer the Focal Length...........PERIOD! > > Those pinhole sites have variable FOCAL LENGTH > cameras > illustrated that change the distance between the > film > and pinhole......They also NEED to have different > pinholes available to use BECAUSE the effective > f/value is a mathmatical relationship between the > actual size of the hole and the focal length > selected. > Sharpness/circle of confusion dictates that the size of the pinhole > needs > to change with a FOCAL LENGTH change > ................... > > "I'm in the planning process for a pinhole of about > "normal" focal length....(with)........a Canon D60." > > > SO A "NORMAL" FOCAL LENGTH (IMAGE) FOR YOUR 35MM > CAMERA.......is equal to the diagonal measurement of > the film size........just shy of 2"........That > means > your pinhole would be best located near the front of > the lens mount.......a body cap with a hole in it(or > add a close/short extension tube)........to mount > your > carefully sized pinhole. Just add a longer extension > tube and a LARGER DIAMETER pinhole and you'll have a > telephoto image............. > > WELL ENOUGH of my rantings.............I trust that > YOU will read enough of those sites and other books > to > gain more information and a better understanding of > (pinhole) photography.............. > > LONG.....MAY YOU EXPOSE!............Sincerely, Doug > > > > > > __________________________________________________ Do you Yahoo!? New DSL Internet Access from SBC & Yahoo! http://sbc.yahoo.com
