Originally posted by John Wiggs I have recently adapted a Leica 400 6.8 telyt for birding and have difficulty getting shrp focus with manual lenses, even pentax lenses. What seems in focus isn't when viewed in the LCD and falls short of acceptable by 4x or 5x magnification. Anyone got suggestions on how to deal with manual focusing.
John,
First of all you need rock steady support. When testing focus, you should also use either a remote release or the 2 sec. self-timer. Also make sure you turn the Shake Reduction OFF.
Then try to rig a shot with a tape measure that you can focus along, or maybe follow the procedure from Yvon Bourque:
PENTAX DSLRs: PART-1. Autofocus Adjustment for the Pentax K20D, Custom Setting No 35
...to make sure your camera and lens is properly calibrated to each other. When testing this way, you got to trust the focus confirmation hexagon rather than your eyes.
I don't know your particular lens, but the Leica name do something to one's expectations, doesn't it? Even with the FA*600/4, I find that "sharpness" as evaluated on the camera LCD screen is abysmal. However there's more to sharpness than preceived detail. If the rendering from your lens has good contrast, the end product will look good even if fine detail looks a bit soft on the LCD.
hth,
Jostein