On Jun 16, 2011, at 02:03 , Ecke PDML wrote: > Sounds like it could be done with a macro rail except for the folding bit? > Cheers > Ecke
Could be. As long as you get consistent separation left to right. Couple of marks on the rail would be good enough. > > 2011/6/16 Joseph McAllister <[email protected]>: >> Nice stereo pairs can be made with a little gadget I picked up long ago. >> With it you shoot one image (full frame film or sensor) then this pantograph >> or parallelograph moves the camera up and over to a position an eye's >> distance away, on the same plane. >> _______ _______ >> \______\ to /_____/ (only it folds all the way down to flat in both >> directions) It has a female socket on the bottom plate, and a male screw >> post on the top, adjustable so you can snug the camera back up against the >> short lip at the rear of the top plate assuring the same 90° to subject at >> both ends. >> >> Print both images, screw your eyes apart so they blend the two into a 3D >> image. It takes practice. Many hours on a photo interpretation table with >> similar aerial pairs taught me to do away with the special stereo lenses >> used on the light table, unless I needed more power to look more closely at >> something. You can also view the pair on a monitor by viewing two up in >> Lightroom or Aperture. Adjust the size of the viewing window to make it >> easier to blend the two images. Too far apart and it can't be done. >> >> Joseph McAllister >> [email protected] >> >> THE SENILITY PRAYER : >> Grant me the senility to forget the people >> I never liked anyway, >> The good fortune to run into the ones I do, and >> The eyesight to tell the difference. >> >> On Jun 9, 2011, at 08:36 , John Francis wrote: >> >>> On Thu, Jun 09, 2011 at 04:02:44PM +1000, Anthony Farr wrote: >>>>> >>>>> I know it won't work with digital because of the sensor dimension ... >>>>> bummer. >>>>> >>>> >>>> Are you sure of that? Doesn't it just split the frame down the middle >>>> into a left and right image? Does the format size or the field of >>>> view make any difference? >>> >>> Yes, it makes a difference, but not one impossible to overcome. >>> >>> The adapter is designed to produce left and right images covering the >>> same field of view on one frame of film. Just using that on a smaller >>> sensor will lose the left third of the field of view from one half, >>> and the right third of the field of view from the other. This means >>> the only part of the field of view in both parts is the central third. >>> >>> The way to compensate for that is simple; use a lens which covers the >>> same field of view on the smaller sensor as the lens for which the >>> adapter was designed when it is used on a full-frame sensor. >>> >>> I believe the adapter was designed for use with a 50mm or 55mm lens. >>> That means you should use something like a 35mm lens on APS-C, >>> I'd expect anything in the 31mm - 40mm range would work just fine. >>> Joseph McAllister [email protected] "Gaudeamus igitur, juvenes dum sumus..." http://tinyurl.com/ndmfhb -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
