Tamron M42 User manual

Type
User manual

Tamron M42: A versatile mount adapter for your photography adventures. With its sturdy construction and compatibility with various lenses, this adapter opens up a world of creative possibilities. Capture stunning wide-angle shots with the 35mm lens or explore the versatility of the 28mm lenses. Whether you prefer the robust P-CS model or the compact "For Pentax II" version, you'll appreciate the precise aperture control and smooth operation. Unleash your creativity and expand your lens collection with the Tamron M42 mount adapter.

Tamron M42: A versatile mount adapter for your photography adventures. With its sturdy construction and compatibility with various lenses, this adapter opens up a world of creative possibilities. Capture stunning wide-angle shots with the 35mm lens or explore the versatility of the 28mm lenses. Whether you prefer the robust P-CS model or the compact "For Pentax II" version, you'll appreciate the precise aperture control and smooth operation. Unleash your creativity and expand your lens collection with the Tamron M42 mount adapter.

Tamron M42 Adapt a Matic Mount Actuating Pin Assembly Fix
By Wade Spradley
Lens background.
I acquired a few Tamron Adapt-a-Matic mount prime lens for my collection. I was really
interested in the 35mm wideangle which I acquired with a Topcon Adapt-a-Matic mount
for a very reasonable price off the notorious auction site so I could examine it before I
committed myself any further. I determined that the build quality was exceptionable for
the lens for its period. This is one of the few Tamron 35mm wideangle manual focus
prime lenses out there. There is an earlier version that is of a preset design in a T-mount
format. These Adapt-a-Matic lenses were only produced within a 4 year period 1969-
1973 according to http://www.adaptall-2.com. During this time many of these designs
were revised. The 35mm wideangle I acquired is one of the later revisions which
involved redesign of aperture ring and focus grip details. No change to the optical design.
The two 28mm wideangles I also added were one each of the original 62mm optical
format and a later revised 58mm optical redesigned of the lens which respectively
involved redesign of aperture ring and focus grip details as well.
I subsequently purchased another Adapt-a-Matic lens for the M42 mount to use on the
35mm wideangle. The two 28mm lens came with their respective M42 Adapt-a-Matic
mounts. The first one is the P-CS model which seems to be a bit more robust with its
internal aperture actuating assembly compared to the later model. The actuating pins on
both models are swaged so they do not fall out and foul the lens being used. The P-CS
model has a larger flat pin base used to activate the arm in contact with the internal lens
aperture throttle. The notch in the M42 mount fits over a screw to align the mount to the
lens used as you carefully emplace the internal mount lever used to make contact with the
lens aperture assembly throttle. Some resistance may be encountered in the attachment.
The M42 mount is in two separate pieces the silver outer ring is screwed on to secure the
M42 mount section to the lens.
The underside of the P-CS Adapt-a-Matic M42 mount. Notice how the lever arm sits on
the flat actuating pin and its size. There is a slight bend to the actuating arm sitting on the
pin, That is normal. Also note the M42 arm with its roller bearing that contacts the
internal lens aperture throttle.
Next picture is the underside of the "For Pentax II" Adapt-a-Matic M42 mount, second
M42 version. This one has been fixed. Notice the actuating flat pin base is smaller and
there is no bend in the contacting arm sitting close to the center of the actuating pin.
Both of the "For Pentax II" Adapt-a-Matic M42 mounts I acquired originally were
aggressively maladjusted due to not being installed correctly on their originating lens. In
this condition they were non functional unless the original lens A/M switch was used in
the A position.
In the next picture you can see galling marks behind the aperture pin arm and where the
roller pin arm was slammed up against the inside edge in front of the screw holding the
spring.
In this next photo of the second "For Pentax II" Adapt-a-Matic M42 mount (ignore the
fuzzy) you can see the offset pin contact arm how it is sitting on the back rim of the M42
mount and not the flat plate of the actuating pin. As shown in the prior pictures. Even the
internal roller arm has to be re-aligned to sit correctly to actuate the internal aperture
throttle in the lens.
Next is a closeup of the actuating arm. You can see the galling behind the arm next to the
actuating pin and where the roller arm has been wrenched up against rim next to the
screw holding the spring. This was a lot worse than you see here now, since I started
working on it before I realized I wanted to document it...
You can see how tough the metal used in the actuating pin lever and can imagine the
force used to bend it out of place since the M42 mount metal composition gave first. So
you can imagine the force you will need to apply to bend the actuating arm back into
place. You will need to choose your tool(s) carefully.
You will need to bend the rear contact arm back until it contacts the rear actuating pin
base until it looks like it is in the middle of the round pin face just slightly off from
middle as you see here. Be careful on how much force you use so you do not malform the
assembly.
Next you may have to rebend the roller bearing arm so it correctly contacts the internal
aperture throttle of the lens. Using slight downward force to adjust in most cases.
Once you are satisfied with your adjustments reattach mount to your respective Adapt-a-
Matic lens and test the A/M switch function to ensure it engages correctly with the
aperture pin. If the lens is functioning right your are done.
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Tamron M42 User manual

Type
User manual

Tamron M42: A versatile mount adapter for your photography adventures. With its sturdy construction and compatibility with various lenses, this adapter opens up a world of creative possibilities. Capture stunning wide-angle shots with the 35mm lens or explore the versatility of the 28mm lenses. Whether you prefer the robust P-CS model or the compact "For Pentax II" version, you'll appreciate the precise aperture control and smooth operation. Unleash your creativity and expand your lens collection with the Tamron M42 mount adapter.

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