Adjusting focus on a Canon

[billh]

Advertisement (gone after registration)

This guy changed the position of the sensor:

 

http://forums.dpreview.com/forums/readflat.asp?forum=1032&thread=22422823

 

Would the distance Canon uses to adjust the focus work better with the Ms than using the moon or some other very distant object?

 

http://www.cps.canon-europe.com/kb/detail.jsp?faqId=1131

[carstenw]

Leica does 1m, 10m and infinity, as far as I know, so I would say that they have the bases covered. Note that a rangefinder is very different than a single lens reflex...

[robsteve]

Bill:

 

I read in a Leica M2 service manual that the infinity of a lens is the focal length squared times 1000. I asked Gerry Smith at Kindermann what a good target was and he suggested a radio tower a couple of km away.

 

The Leica jig for testing focus simulates the distances by off setting the target reticles to one side. They have a series of reitcles at a the same distance, one used for infinity, another used for 10m. A third reticle is exactly .7m away from the film plane and that is used for the near focus setting. The jig also includes a magnifying instument that fits the eyepiece to help with the focusing.

 

Robert

[carstenw]

Rob, I recall reading somewhere that the near adjustment was done at 1m rather than 0.7m, which makes sense due to the presence of some lenses in the lineup which don't focus closer than 1m, like the Noctilux. Are you sure about the 0.7m?