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Step 5Mount the split-image focusing screen!
Now we'll put the split-image screen in its place. It is no big deal, just pop it in and lock the metal frame back in its place. But we are not done yet! We have to make sure that focusing screen is in correct distance from the mirror to tell us the correct focusing information.
For this purpose you'll need the original EOS focusing screen, or a translucent paper.
Open the film cover, place your camera on a firm place. Set the exposure to 30 seconds or bulb if you have a remote cable, and direct your camera to a vertical line (i.e. a post) at 4-5m distance. Use a steel meter to measure the exact distance between the vertical line and the film pane. Then focus your manual lens on the object by looking through the film chamber with the focusing screen (or translucent paper) on it at 30 second exposure. Once you feel that it is perfectly focused, read the meter reading, it should be close to what you measured. If so, you know that your mount adapter is a good one. Be careful no to touch the shutter curtain or put something on its way when it's open, you can damage it!
Now, without changing the focus, look at the same object through the viewfinder. Is the split-image screen showing a perfectly aligned image? If so, you are done... If not, check:
- If you need to turn the lens towards infinity to get it aligned, you need to put spacers between the focusing screen and the body.
- If you need to turn the lens towards closer focus distance, then you need to take spacers out (if you put any), or put the prism side upwards (it works both ways)...
When you are done, you are good to go! In the last photo below I have two strips of adhesive tape to adjust the spacing between the focusing screen and camera...
For this purpose you'll need the original EOS focusing screen, or a translucent paper.
Open the film cover, place your camera on a firm place. Set the exposure to 30 seconds or bulb if you have a remote cable, and direct your camera to a vertical line (i.e. a post) at 4-5m distance. Use a steel meter to measure the exact distance between the vertical line and the film pane. Then focus your manual lens on the object by looking through the film chamber with the focusing screen (or translucent paper) on it at 30 second exposure. Once you feel that it is perfectly focused, read the meter reading, it should be close to what you measured. If so, you know that your mount adapter is a good one. Be careful no to touch the shutter curtain or put something on its way when it's open, you can damage it!
Now, without changing the focus, look at the same object through the viewfinder. Is the split-image screen showing a perfectly aligned image? If so, you are done... If not, check:
- If you need to turn the lens towards infinity to get it aligned, you need to put spacers between the focusing screen and the body.
- If you need to turn the lens towards closer focus distance, then you need to take spacers out (if you put any), or put the prism side upwards (it works both ways)...
When you are done, you are good to go! In the last photo below I have two strips of adhesive tape to adjust the spacing between the focusing screen and camera...
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