Hi Michael,
Welcome to IIS. I have a 102 f5 achro and its a nice scope for mucking around with, or as I use it, a finder scope but for photos its really a no no.
IMO you would want to get an EQ5 with a 80 or 100 ED refractor. Better still a 100 ED on an HEQ5 pro mount. Look up Bintel for details on different mounts.
If you do the EQ3 you'll outgrow it quickly and wish you had got the EQ5. All can be got second hand if you wait long enough or put an add in the wanted section.
Matt
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