schneider symmar 150 f5.6 (set?) screw issue

[ethan_melad]

i am borrowing this lens from a co-worker, and just attempted to mount it on a toyo lens

board. after tightening the lens down, i realized it was not sitting flush to the board. it turns

out there is a small flat top screw on the rear of the lens that sits higher than the surface. i

dont have a small screwdriver with me, so i cant check whetherthe screw could just be

tightened down, but it looks from the edge that it has a head and would not sink into the

leans. anyone have any experience with this lens? seen this before?

 

thanks

e

[dan_fromm1]

The screw's head is intended to go into a matching hole in the board. This to prevent the shutter from rotating on the board. Most people remove the screw, few boards have the matching hole.

 

Don't try to screw it farther into the shutter. If you can't remove it, give it all up as a bad job until you can. With the lens in place, you'll get an unintended tilt that you probably won't be able to adjust away. And with it in place you may have an unintended light leak too.

[ethan_melad]

thanks.

[michael_briggs2]

As Dan says, the best thing to do is to remove the screw. Since this lens belongs to your co-worker, place the screw in some container so you won't lose it. These small screws seem to be a trick that traps beginners -- this is a common question, e.g., see http://www.photo.net/bboard/q-and-a-fetch-msg?msg_id=00Ev3Q