[bojan]

Well, after some time spend in unsuccessful attempts to find the graphical film, I tried with printing on foil for overhead projections.. just to test the size and general concept.

The results are not that great from the aesthetic point of view, but the graticule is actually very useful :-)

So I decided to post the pdf file here, in hope somebody may want to use it too.. the file should be printed on 1:1 scale, with maximum resolution the printer can offer (this file is produced with 4000dpi), the graticule itself should be cut out with scissors. The printing side should be mounted on top (closer to the eye), after original glass (for Northern hemisphere) is removed from holder.
Also attached is the crop from the test shot (200%), 10 minutes exposure with 135mm lens (ISO100, Scorpius region), some drift is visible on it, but this only means the alignment is OK for shorter lenses and/or exposures up to 2 minutes.. more than enough for acceptable wide angle photos (I usually take 1 minute at F5.6 maximum.. before LP kicks in).