Introduction

Partial / tactical teardown, for cleaning and quick repair.

  • Face lens down, (front on table)

  • Remove 3 screws on the lens mount

  • Remove lens mount

  • Pull / push trpod mount towards back of the lens, and remove it. Be patient, it is very precisely assembled.

  • Loosen tripod ring, till it can rotate.

  • Remove tripod ring. Be aware, the is a 90 degree stepping steel ball inside.

  • photos TBD

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Do NOT remove 3 focus scale calibration screws. I actually did that when attempting disassembly. And luckily, I also marked the original position before that. I tried to remove the front element group first. But the thread is some how locked and impossible to turn using my current tooling. So I gave up, and most cleaning does not need to remove front group. Remove focus ring rubber. Take your time, it's a huge piece and might be glued.
  • Do NOT remove 3 focus scale calibration screws. I actually did that when attempting disassembly. And luckily, I also marked the original position before that.

  • I tried to remove the front element group first. But the thread is some how locked and impossible to turn using my current tooling. So I gave up, and most cleaning does not need to remove front group.

  • Remove focus ring rubber. Take your time, it's a huge piece and might be glued.

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Remove 2 focus stop screws. Your's might be in different holes. Also you may like to calibrate that. There 3 holes at the infinity end, and 2 at the close-up (8m / 25 ft) end. Remove 2 focus stop screws. Your's might be in different holes. Also you may like to calibrate that. There 3 holes at the infinity end, and 2 at the close-up (8m / 25 ft) end.
  • Remove 2 focus stop screws. Your's might be in different holes. Also you may like to calibrate that. There 3 holes at the infinity end, and 2 at the close-up (8m / 25 ft) end.

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READ THIS FIRST! In the following step,  rotate slowly, and apply gentle force pulling front and rear apart, and mark the position of separate. Rotate the rear half of the lens, towards close-up direction (CW as looking downwards), pass 8m/25 feet mark and continue, while applying gentle force pulling rear part up, until they separate, mark the point.
  • READ THIS FIRST! In the following step, rotate slowly, and apply gentle force pulling front and rear apart, and mark the position of separate.

  • Rotate the rear half of the lens, towards close-up direction (CW as looking downwards), pass 8m/25 feet mark and continue, while applying gentle force pulling rear part up, until they separate, mark the point.

  • When assemble them back, attach from this angle/point.

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The front tube, thread on the inner side. The rear tube, thread on the outer side.
  • The front tube, thread on the inner side.

  • The rear tube, thread on the outer side.

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This is just a partial tear down. This lens is extremely well made, and very very precise. Until this point, this is a reasonable "maintenance teardown". And you can do most mirror and lens cleaning and grease replace. Putting them back from the point/angle you marked in previous step, the focus scale does not need a calibration.
  • This is just a partial tear down. This lens is extremely well made, and very very precise.

  • Until this point, this is a reasonable "maintenance teardown". And you can do most mirror and lens cleaning and grease replace.

  • Putting them back from the point/angle you marked in previous step, the focus scale does not need a calibration.

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Conclusion

To reassemble your device, follow these instructions in reverse order.

Terrance

Member since: 11/17/2009

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