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For viewing the sun, apertures above say 100mm can sometimes be used- depends very much on the local seeing conditions (better in the early morning).
A 100mm aperture will allow the recording of solar surface granulation.
A good camera is equally imprortant. The "weapon of choice" still seems to be the IS DMK series cameras.
The size of the solar disk is approx 0.5 degree....if your eyepiece has a AFOV of say 50 degrees then you could use an eyepiece which gives around x80-x100 and it would fit.
CCDcalc is a great freeware resource to check out the field coverage of various camers.....
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