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The 102 F9 has a focal length of 918mm and so my Tak LE 5mm (x184) only gets used on nights of better than average seeing. Using this combo, I have easily split Antares in moments of steady seeing.
I understand the 103 is an F7 system? If so, then a 5mm would give you a magnification of around x144.
I have found that the 102 F9 holds up to high magnifications very well when the seeing is good. As expected, even on brighter DSO’s such as NGC 253 and M83, all you get to see is a greyish smudge, so don’t expect too much on faint galaxies.
Cheers
Dennis
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