Re-gain infinity focus on Minolta 50mm f1.7 lens

After you have installed the rear socket, now is time to install the front element and re-gain the infinity focus of Minolta 50mm f1.7 lens.  Before I start the guide , let understand more on infinity focus.

What is infinity focus?

Infinity focus mean a particular lens able to lock focus at infinity distance.

how to focus to infinity?

Set the camera focusing method to center point AF. Point the camera lens to a point which is far far away.Press the shutter button half, focusing begin and lock on the target. if you look at the focusing distance window, you can see the white line is pointing to infinity.

Do you able to understand what is infinity focus?

Let start today’s sharing on re-gain Infinity focus on Minolta 50mm F1.7 lens.

1Prepare to assemble focuing distance ring

As you can see from the picture, the focusing part has been dis-assemble in previous sharing. Next step is to install the focusing distance part.

2Assemble the focusing distance ring

Installing the focusing distance part back to the lens.

3After install the focusing distance ring

Insert the metal ring and tight the screw (3 pc instead of 6pc  is good enough)

4Assemble the front element

Clean the front element with IPA before re-install back to the helicoid

5After front element

Tighten the 3 screw for the front element

6mount it to a digital camera

Mount the lens into the dSLR body. To re-gain the infinity focus , this is the method that I used

  1. Mount the lens in the dSLR body
  2. turn on the camera
  3. lens reset to infinity by camera
  4. Set the camera setting to … AF-S , Spot focusing
  5. Loosen the focusing distance’s screw
  6. Point the camera to infinity and half press the shuttle.
  7. Camera AF screw drive will set the infinity focus for the lens element
  8. distance scale will not show correctly , as show as below.

7after infinity focus

white line show where the focusing distance which is incorrect. it should be infinity focus.

8Rotate the focusing distance scale to infinity

Rotate the focusing distance ring to infinity focus as shown above.

9Screw in all the screw

With out power off the camera, tighten the 6 screw.

10Install the hood

Install the hood back to the body

11Installing the front ring

Installing the front ring cover.


Any precaution steps  needed ?

  • Remember to clean the optic before re-installation
  • prior to tighten the 6 screw for the focusing distance ring, do not switch off the camera

My personal experience

The steps above look complicated,I I have used 4 hour for the first task to completely re-assemble it. It can cut short to 10 mins if you are familiar with the lens repair.


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