Archived posting to the Leica Users Group, 1998/04/19
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Marc, I took my M2 instruction book out to understand this further. It reads : "The rangefinder of your Leica M2 also enables you to check whether a subject in front of, or behind, the point of sharpest focus will be acceptably sharp or not. For this you use the projections at the top and bottom edges of the rangefinder field rectangule. These projections show the depth of field of a standard 50mm lens, the lower for the all round aperture of f/5.6, and the upper for f/16. After focusing the subject of major importance, the appropriate projection is superimposed on other subjects before and/or behind the point of focus. If the seperation of the double image outlines still lies within this projection, the image will be acceptably sharp. To use this special device most effectively, it is advisable to test only the edges of the foreground and background subjects." My question are : 1. Is this only for 50mm lens? 2. Is this only for between f/5.6 to 16? 3. How do you see this double superimposed image against the top and bottom notches? Try focusing on a on my sofa then looked at the TV behind. I see double image of the TV and it looks like its between the upper notch. My metered aperture is F2.8. How do I relate this to the f16? Appreciate your kind clarification. Regards, Lee Fellow Lugger from Singapore It sounds like in practical, this is also useful for other lens and apertures. - ---------- > From: Marc James Small <msmall@roanoke.infi.net> > To: leica-users@mejac.palo-alto.ca.us > Subject: Re: [Leica] DOF indicator > Date: Sunday, April 19, 1998 12:27 PM > > If an object is in focus in the main box AND in the wide, upper notch, it > will be in focus at f/16; if it is in focus in the narrower, bottom notch, > it will be in focus at f/5.6. Find an object slanting away, such as a > telephone book on a bare table, and experiment. It's a bit hard to > explain, but it does work in practice. > > Marc > > > msmall@roanoke.infi.net FAX: +540/343-7315 > Cha robh bas fir gun ghras fir!