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T2 adapter that can disable the aperture pin
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PostPosted: Sun Jun 24, 2018 12:24 am    Post subject: T2 adapter that can disable the aperture pin Reply with quote
People was talking such an adapter for M42 lenses before. Now such M42-NEX
adapter exists, which has a thin ring inside the adapter to disable
the aperture pin on the lens.

For my case: the lens mount I have is a YS mount, which is basically a T/T2
mount with aperture pin. One YS lens I have has an A/M switch which can be
switched to M to disable the pin. So I just straightly go ahead with a T2-NEX
adapter. Another lens doesn't have the A/M switch (no YS mount included),
so the lens will be wide open with a T2-NEX adapter. does such a T2-Nex
adapter exist which can disable the aperture pin, or I'll need to either DIY on
the lens or find a YS adapter (which usually comes with a lens)? Thanks!


PostPosted: Sun Jun 24, 2018 9:17 pm    Post subject: Reply with quote
Yes. I have both versions for my Sony NEX. An M42 adapter with just the threads for an M42 lens, and an adapter that has a lip at the end of the threads which contacts the aperture pin. I had to buy the one with the lip after I bought the plain one, when I discovered that one of my M42 lenses, which did not have the A-M switch, was stuck wide open with no way to control the aperture. So I ordered the adapter with the lip and problem was solved. One thing I have found, though, is that if I have my M42 lens screwed down tight on the adapter, it is difficult to move the aperture ring. So what I do now is leave the lens just a little loose on the adapter so I can adjust the aperture ring. Then once I have it set, I screw the lens down the rest of the way, which is maybe only a quarter turn.


PostPosted: Mon Jun 25, 2018 12:03 am    Post subject: Reply with quote
cooltouch wrote:
Yes. I have both versions for my Sony NEX. An M42 adapter with just the threads for an M42 lens, and an adapter that has a lip at the end of the threads which contacts the aperture pin. I had to buy the one with the lip after I bought the plain one, when I discovered that one of my M42 lenses, which did not have the A-M switch, was stuck wide open with no way to control the aperture. So I ordered the adapter with the lip and problem was solved. One thing I have found, though, is that if I have my M42 lens screwed down tight on the adapter, it is difficult to move the aperture ring. So what I do now is leave the lens just a little loose on the adapter so I can adjust the aperture ring. Then once I have it set, I screw the lens down the rest of the way, which is maybe only a quarter turn.


Thanks. I know exactly what you are talking about --- the lip (the thing what I called the thin ring inside the adapter). I have it too. What I am
looking for is such a T/T2 adapter to disable the pin on a YS mount lens.

Regarding the tightness, I experienced the same thing one of my T mount lenses with a T adapter. I did the same thing as you did but didn't feel
the adapter is secured enough (I just simply use another T adapter on that particular lens).
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