I've got a 4" Celestar f/8 reflector (it's old schoo...1957, made by Fecker), and it's SO COOL! I've got some bigger scopes, too, but this lil' fella is so much fun.
Something that I've noticed about astronomy is there are standard observing platforms: 8" dob, 100mm refractor, 8" SCT being some really popular ones, that might give the impression that anything else isn't worth using, and well, quite to the contrary.
The Messier objects are excellent targets, plenty of double stars, and of course, lunar and planetary work are a favorite. This time of year my "greatest hits" list for the 4" would include:
- Orion Nebula
- M93 and the other open clusters low in the south
- M44 and M67 in Cancer
- M35 in Gemni
- Auriga open clusters (M36-38)
- M81 and M82 in Ursa Major
- Alcor and Mizar
- Algieba (double in Leo)
And the moon has been so darn cool with it. Just resolved a crater that's 2 miles wide with the 4".
A "smaller" scope is "stellar" by standards of yesteryear, and for portability, enjoyability, and with real possibility to do serious observing (and hone skills for those times when you've got access to the 16" dobs, too), well, they're just cool!