Bronica Lens - Sticky Shutter?

Thanks for the response, I was afraid of that. So the battery won't help
and I can expect half of my frames to be ruined. Fortunately I purchased
from a store where it can be returned.

"wilt" <wiltw.TakeThisOut@aol.com> wrote in message
news:1111030119.204393.244980@l41g2000cwc.googlegroups.com...
 > An ETRS with a dead battery will fire the shutter at a fixed 1/500th
 > speed, not be stuck open half the time. The shutter in the lens is
 > probably in need of CLA.
 ><!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Bronica Lens - Sticky Shutter? 

On Thu, 17 Mar 2005 05:32:15 UTC, "JK" <jk.TakeThisOut@nospam.com> wrote:

 > Thanks for the response, I was afraid of that. So the battery won't help
 > and I can expect half of my frames to be ruined. Fortunately I purchased
 > from a store where it can be returned.

If it's the same principle as with the SQ. you can test the shutter by
taking off the lens, locating a tiny protrusion behind one of the bayonet
mount claws, gently pressing it with the fingernail or some convenient
instrument and moving the shutter cocking/release device (noses protruding
form the rear end of the lens) from the green dot all the way to the other
end of its notch (end of the red line). With the diaphragm wide open, you
should see the shutter close, flash open (that's the 1/500 s) and close
again.

Don't forget to revert the cocking device to the green dot before
attempting to remount the lens.

Hartmut

--
Please use 'Reply-to' for personal e-mail.
Bitte fuer direkte emails 'Reply-to' benutzen.<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Bronica Lens - Sticky Shutter? 

Hartmut Krafft wrote:

 > If it's the same principle as with the SQ. you can test the shutter by
 > taking off the lens, locating a tiny protrusion behind one of the bayonet
 > mount claws, gently pressing it with the fingernail or some convenient
 > instrument and moving the shutter cocking/release device (noses protruding
 > form the rear end of the lens) from the green dot all the way to the other
 > end of its notch (end of the red line). With the diaphragm wide open, you
 > should see the shutter close, flash open (that's the 1/500 s) and close
 > again.
 >
 > Don't forget to revert the cocking device to the green dot before
 > attempting to remount the lens.
 >
 > Hartmut
 >

Hi,

while we are on the issue of bronica leaf shutters, I have a 150mm 3.5 S
lens that behaves strangely when using the MLU on an SQi body. My other
80mm works fine so the problem is on the 150.

Sometimes, in single MLU, the shutter "uncocks" when the MLU lever is
tripped. It is not possible to fire the shutter. I will have to recock
the shutter (and the MLU goes back to normal unlocked position...) Does
anyone have any idea what is wrong ? I suspect some bad contact or bad
alignment somewhere. Sometimes, flipping the MLU also triggers the 1/500
shutter. Other times, the shutter will pretend to fire but nothing
happens.

I have tried cleaning the contacts but it doesn't help.

My fix at the moment involves holding the lens firmly, pressing it in
the direction of mounting the lens when flipping the MLU switch. If that
doesn't work, I try remounting the lens.

Any ideas anyone ?

Wai-Ming<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Bronica Lens - Sticky Shutter? 

On Thu, 17 Mar 2005 13:14:14 UTC, Wai-Ming Ho <wai-ming.ho.RemoveThis@crf.canon.fr>
wrote:

 > I have a 150mm 3.5 S
 > lens that behaves strangely when using the MLU on an SQi body. My other
 > 80mm works fine so the problem is on the 150.
 >
 > Sometimes, in single MLU, the shutter "uncocks" when the MLU lever is
 > tripped. It is not possible to fire the shutter. I will have to recock
 > the shutter (and the MLU goes back to normal unlocked position...) Does
 > anyone have any idea what is wrong ? I suspect some bad contact or bad
 > alignment somewhere. Sometimes, flipping the MLU also triggers the 1/500
 > shutter. Other times, the shutter will pretend to fire but nothing
 > happens.

Take off the magazine, flip the double exposure lever (so that the release
won't be blocked) and look inside the body to see what happens.

If you use the MLU in the first position, the mirror lifts, and the ring
that controls both the diaphragm and the shutter release rotates for about
80% or so. The couplings on the lens will stop before the end of the red
line.
This will cause the diaphragm to close as well as the shutter (you should
see both in the lens)

If you then press the release button, the ring rotates the left 20%, on
this last part of the way the shutter gets released. The time for which it
will stay open is controlled electronically from the camera body.

When you cock the body, the ring will rotate the other way (can be seen a
litlle while before the mirror comes back).

I suspect that there's a misalignment between the release control ring in
the camera and the two 'noses' on the rear end of the lens - somehow, they
seem to slip out of the ring, which of course shouldn't happen. Either
these 'noses' are worn on your lens - compare them to the 80 mm - or the
ring in the camera is warped, maybe someone tried to mount a released lens.

But by carefully watching what happens from inside, you should be able to
find out where it actually slips.

 > I have tried cleaning the contacts but it doesn't help.

Nope, they just control the shutter release time and provide the
information of the diaphragm setting. This is a mechanical problem (and
therefore easier to investigate).

HTH
Hartmut

--
Please use 'Reply-to' for personal e-mail.
Bitte fuer direkte emails 'Reply-to' benutzen.<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Bronica Lens - Sticky Shutter? 

Hartmut Krafft wrote:

 > On Thu, 17 Mar 2005 13:14:14 UTC, Wai-Ming Ho <wai-ming.ho DeleteThis @crf.canon.fr>
 > wrote:
 >
  >>Sometimes, in single MLU, the shutter "uncocks" when the MLU lever is
  >>tripped. It is not possible to fire the shutter. I will have to recock
  >>the shutter (and the MLU goes back to normal unlocked position...) Does
  >>anyone have any idea what is wrong ? I suspect some bad contact or bad
  >>alignment somewhere. Sometimes, flipping the MLU also triggers the 1/500
  >> shutter. Other times, the shutter will pretend to fire but nothing
  >>happens.
 >
 >
 > Take off the magazine, flip the double exposure lever (so that the release
 > won't be blocked) and look inside the body to see what happens.
 >
 > If you use the MLU in the first position, the mirror lifts, and the ring
 > that controls both the diaphragm and the shutter release rotates for about
 > 80% or so. The couplings on the lens will stop before the end of the red
 > line.
 > This will cause the diaphragm to close as well as the shutter (you should
 > see both in the lens)
 >
 > If you then press the release button, the ring rotates the left 20%, on
 > this last part of the way the shutter gets released. The time for which it
 > will stay open is controlled electronically from the camera body.
 >
 > When you cock the body, the ring will rotate the other way (can be seen a
 > litlle while before the mirror comes back).
 >
<snip>
 >
 > HTH
 > Hartmut
 >

Thanks very much!

I will take another look at it tonite.

Wai-Ming<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Bronica Lens - Sticky Shutter?