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Do you mean the secondary mirror of the Newtonian (rather than a mirror or prism "diagonal")?
Not likely, but it is possible that the secondary mirror is too small with the 2" focuser because that will support much wider FOV eyepieces. Here is how to check:
Once the secondary mirror is centred under focuser and scope is collimated, take your widest true field eyepiece, point it at a bright star placing it half way between the centre and the edge of field. Defocus the image winding the focuser barrel outwards (away from to secondary) until the star image turns into a shadow of your spider with the mirror behind it. If you can see the mirror clips in that image (assuming you have some), the secondary is large enough.
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