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Step 6Trim the mirror area for letting your manual lens fit!
Now, you gotta modify the mirror chamber to accommodate your manual M42 lenses.
There are two problems, the first is when you are screwing the M42 in its place, the diaphram pin slightly hits a board on top. There is a risk of breaking the pin, which is not nice. So, we'll shave plastic piece on the route off. The pin in discussion is shown in the first photo, the steps are shown on the next three photos. If you don't want to modify (damage) your camera like this, you can always put the lens at Manual diaphram mode and screw the lens in with front facing down.
The second problem is the mirror slapping the rear group of the lens when focus is at infinity. This problem varies with the lens make/model. With Takumar 50mm, the problem is very serious, the mirror doesn't even move up completely (check out the fifth photo). Takumar has a gigantic rear element, and we cannot trim the mirror glass (so I am listing my Takumar on ebay soon). But with Zeiss Flektogons I have, the mirror only gets stuck on the way down, so trimming (shave material off with an X-Acto blade) the bottom edge of the mirror is enough to solve the problem. Check out the sixth and seventh photos. As you can see, it works great now (photos eight and nine).
Now finally we have an EOS-300 body that we can use M42 lenses on and focus manually easily...
Use P or Av modes for auto exposure with evaluative metering. If you use exposure lock, the exposure will be measured using partial metering. In M mode you can use center-weighed metering by exposing according to needle-scale.
Use the Manual/Auto switch to control the aperture on your lens. You can keep the aperture at desired setting and switch to Manual immediately before you are shooting. Or you can do it by changing the values slowly with a depth-of-field preview opportunity!
Good luck!
There are two problems, the first is when you are screwing the M42 in its place, the diaphram pin slightly hits a board on top. There is a risk of breaking the pin, which is not nice. So, we'll shave plastic piece on the route off. The pin in discussion is shown in the first photo, the steps are shown on the next three photos. If you don't want to modify (damage) your camera like this, you can always put the lens at Manual diaphram mode and screw the lens in with front facing down.
The second problem is the mirror slapping the rear group of the lens when focus is at infinity. This problem varies with the lens make/model. With Takumar 50mm, the problem is very serious, the mirror doesn't even move up completely (check out the fifth photo). Takumar has a gigantic rear element, and we cannot trim the mirror glass (so I am listing my Takumar on ebay soon). But with Zeiss Flektogons I have, the mirror only gets stuck on the way down, so trimming (shave material off with an X-Acto blade) the bottom edge of the mirror is enough to solve the problem. Check out the sixth and seventh photos. As you can see, it works great now (photos eight and nine).
Now finally we have an EOS-300 body that we can use M42 lenses on and focus manually easily...
Use P or Av modes for auto exposure with evaluative metering. If you use exposure lock, the exposure will be measured using partial metering. In M mode you can use center-weighed metering by exposing according to needle-scale.
Use the Manual/Auto switch to control the aperture on your lens. You can keep the aperture at desired setting and switch to Manual immediately before you are shooting. Or you can do it by changing the values slowly with a depth-of-field preview opportunity!
Good luck!
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