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.
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.
Installing the focusing distance part back to the lens.
Insert the metal ring and tight the screw (3 pc instead of 6pc is good enough)
Clean the front element with IPA before re-install back to the helicoid
Tighten the 3 screw for the front element
Mount the lens into the dSLR body. To re-gain the infinity focus , this is the method that I used
Mount the lens in the dSLR body
turn on the camera
lens reset to infinity by camera
Set the camera setting to … AF-S , Spot focusing
Loosen the focusing distance’s screw
Point the camera to infinity and half press the shuttle.
Camera AF screw drive will set the infinity focus for the lens element
distance scale will not show correctly , as show as below.
white line show where the focusing distance which is incorrect. it should be infinity focus.
Rotate the focusing distance ring to infinity focus as shown above.
With out power off the camera, tighten the 6 screw.
Install the hood back to the body
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.