gustav[] pEña said:
I see some stain inside when i use the 50 mode. The NG and 35 mode are just a bit dark. There is also a deep scratch in the front window. Is this replaceble?
I couldnt take the top off. Is there any page step by step ?
This probably won't help quite as much as you'd like, but I've attached a scan from the factory service manual showing the top cover assembly.
You don't need to remove ALL these pieces, but you do need to remove at least (going from memory)
-- Screw on side of advance end
-- Advance knob
-- Shutter speed dial
-- Rewind crank
-- Flash plug on rewind end
and the difficult one
-- Tiny parallax-compensation pin in the accessory shoe. If you've got a grinding tool, I suggest getting a cheap jeweler's screwdriver just large enough to span the slots in this pin, and grinding out a curve in the center so it will fit over the dome of the pin. If you do this, WEAR EYE PROTECTION WHILE GRINDING!
I can't remember whether or not you need to remove the A/R switch (collar around the shutter button) or the pushbutton in the back that releases the advance knob; sorry!
Areas you should check when trying to clean the viewfinder:
-- Eyepiece glass: this actually can be unscrewed without any disassembly, although it's hard to grip. Try putting a flat piece of sticky rubber over it and turning it with the pad of your thumb.
-- Frameline mask: this is a THIN, DELICATE piece of glass with the 50mm and 100mm framelines etched on it in delicate silver lines. It sits just inside the eyepiece. You can clean its outer surface once the eyepiece is removed, but the inner surface is harder to get at (and more fragile, since the silver lines are on that side.) Since this mask reflects the framelines back into the finder, even a little dirt on it can drastically deteriorate the finder view, so cleaning just this one piece often helps dramatically.
-- Rotating prism: You saw this in my 'topless' pics. You can clean all four outer surfaces of it by rotating the magnifying adjustment wheel.
-- Beamsplitter: This block is in front of the rotating prism. The front surface is easy to reach for cleaning; the back surface requires disassembly. Don't risk it unless you can SEE that it's significantly dirty.
-- Rangefinder prism: Over on the other side behind the small window. There's a round prism on the front for adjusting the vertical alignment of the RF image; this can be cleaned from the outside. The inside face of the prism, the one pointing toward the inside of the camera, is accessible if you have a delicate touch.
Again, DON'T try to disassemble all these areas unless you can see that they actually need cleaning. (One way to look is to shine a penlight in from the eyepiece and look from the front.) This rangefinder is rugged and well-designed, but the components are packed together very tightly and the disassembly and reassembly required to get at the inner surfaces is a delicate job. With luck, all you'll need to clean are the easily-reached outer surfaces, since these also are the surfaces most exposed to dirt.
Unfortunately, there's nothing you can do about the scratch in the front window, since that's actually the front surface of the beamsplitter block -- unlike many manufacturers, Canon did NOT put a cover glass over it. (Omitting the cover glass helped them make the viewfinder as bright as possible, but has led to much grief in later years from over-enthusiastic cleaning!)
Good luck...
