I am aware of the relative wisdom of pulling lenses apart. Specific
warnings based on knowledge of this lens or closely related ones are
welcome. Generic ones are unlikely to be helpful.

I have a Tamron 24-70mm Di USD lens whose lock switch is stuck on so that
the lens is 'stuck' in the 24mm position.(Happened rapidly but
progressively over a short period. Turning lens to 24mm position engaged
lock and disengagement got progressively harder and now can not be done).
It urgently requires "unsticking".

I urgently 'need' to use the lens and the (lens-repair-)cavalry is too far
away in space and time. So ...

I wish to investigate dismantling the lens far enough to unstick or to
remove the lens lock.

Other lenses that I have dismantled and assembled have sometimes had means
of dismantly access from both ends of the lens and it may be "safe" and
"simple" to do what I want to achieve. How to do this is not obvious and
I'd rather avoid prying up random rubber pieces to no avail.

Is anyone able to advise how or if 'simple & safe" access to the lens lock
mechanism may be achieved? (I am not afraid of performing sensible
mechanical operations and am aware there are risks. Knowing which
operations may be sensible would be helpful).

**_______________________________**

Notes / longer:

I have a Tamron 24-70mm Di USD  with Sony A-mount.
(This version has "VC" with Nikon and Canon mounts)

The lens lock slider is stuck in the locked position - so it's a 24mm
sub-prime { :-) ] lens.

The lens is out of warranty by a few months.
I wish to use it for an event in 3 days time.
The sole authorised repairer is too far away for safety in space and time.

Every time the lens was turned to 24mm position with barrel horizontal the
lock engaged.  The slider would not disengage the lock. Initially, pointing
the lens front downwards and gently tapping the lens allowed lock
disengagement. Required tapping vigour increased each time and is now not
effective at 'tapping' levels that I do not wish to exceed.

I may return the lens for professional attention in due course but for now
'need to use it'. Unsticking the lock would be enough. Removing the lock
would be acceptable.

I'm aware that interfering with the lens assembly proper may lead to
misalignment which would probably need professional attention and which may
not be repairable. I have pulled various lenses apart in the part - never
with bad consequences. I'm aware that past results do not guarantee future
ones :-).

Thoughts?


            Russell
--=20
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