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Glen, I don't believe the wide mouth adapter will be of any advantage for the 450D's crop sensor's 26.7mm diagonal.
However, full frame sensors like the 5D and 6D etc have a sensor that is ~43mm on the diagonal, which is larger than an M42 T adaptors clear aperture of ~39mm.
Last edited by MrB; 15-05-2014 at 08:47 PM.
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