jdos2
Well-known
Miniature screw-drivers. I don't have any idea what happened between the time I left home and got to Lisbon but when I did get there the 150mm lens was focusing a few mm past infinity, and I later found that all the lenses were the exact same amount. Jewlers screwdrivers from AKI (south side of the Colombo mall) made things all right- but from now on they are a permanent part of my kit. Adjustment took all of 10 minutes, a simple thing.
Wish I knew what I did- I've had the thing a year now in much rougher service and this was the first difficulty I've had with it. I was stopping down when I started suspecting something, but I'm sure I'll find some out-of-focus, and the 150mm lens wide open is rather un-forgiving...
Wish I knew what I did- I've had the thing a year now in much rougher service and this was the first difficulty I've had with it. I was stopping down when I started suspecting something, but I'm sure I'll find some out-of-focus, and the 150mm lens wide open is rather un-forgiving...
I've heard it suggested that high frequency vibration over a period of hours can jiggle the innards of mechanisms out of whack. Maybe yours is a case in point?
jdos2
Well-known
Could well be, I certainly use the camera lots, but it was surprising that it happened on vacation (of course!) and so soon after I put on my new 150mm.
Fixed, pix look good.
Fixed, pix look good.
erayboy
Newbie
I may be mistaken, but according to Mamiya, their lenses are designed to focus just past infinity ... something about allowing for temperature variations and thermal expansion. (Can't find the reference, though.)
jdos2
Well-known
That's something I heard too- but when all lenses line up at infinity but one, and that one takes out of focus pictures close up and wide open...
K
Kris
Guest
Eryboy was right. Two of my Canon lenses and can be focused past infinity and according to the manual, it is to compensate thermal expansion. But the manual also says to look through the viewfinder carefully to focus the lens at its real infinity setting. How do you do that with an RF lens?!
Anyway, I reckon DOF will take care of that slight offset, so nothing to worry about.
Kris
Anyway, I reckon DOF will take care of that slight offset, so nothing to worry about.
Kris