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The 35mm relates to the film size while the 55 mm relates to the outer end of your lens. I have a 135mm lens (focal length) but it takes a 72mm filter. But the lens fits neatly into the Canon 300D which has the standard bayonette lens fittings. If you can remove your lens then you can get a T adapter for it to fit the 1.25" adapter to.
You won't be able to get away from the vignetting problem if you are shooting through an 1.25" opening. The only way to reduce it is to take flat frames but for the degree you will get I don't know how effective it will be.
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