slosync
Member
Hello, I'm in need of someone that's familiar with the focusing mechanism on a Kern Switar 25mm 1.4.
I have it mounted using a RJFinance c to m43rds adapter on my G1. When I turn the focus ring, nothing happens. It turns smoothly but no change in focus. It rotates and stops just short of infinity mark at 50m.
In fiddling with it, there are three little set screws around the perimeter of the focus ring. Should those screws be lose? If I tighten them the focus ring doesn't move.
Does anyone have any ideas as to what the problem could be?
Just as an aside, in order to focus I have to unscrew the lens a little less than a quarter turn to focus at about 30-40 meters and about a half turn to focus 3 or so meters using f/5.6. Test pictures below.
Appreciate any insight...
3-4 meters - focus on little figurine.... unscrew half turn.
30-40 meters - focus on horse head far wall.... unscrew < quarter turn.
Thank you and cheers,
Don
I have it mounted using a RJFinance c to m43rds adapter on my G1. When I turn the focus ring, nothing happens. It turns smoothly but no change in focus. It rotates and stops just short of infinity mark at 50m.
In fiddling with it, there are three little set screws around the perimeter of the focus ring. Should those screws be lose? If I tighten them the focus ring doesn't move.
Does anyone have any ideas as to what the problem could be?
Just as an aside, in order to focus I have to unscrew the lens a little less than a quarter turn to focus at about 30-40 meters and about a half turn to focus 3 or so meters using f/5.6. Test pictures below.
Appreciate any insight...
3-4 meters - focus on little figurine.... unscrew half turn.
30-40 meters - focus on horse head far wall.... unscrew < quarter turn.
Thank you and cheers,
Don