Chris Kelly said:
Its a 6" Newtonian : 100 cm from primary to secondary and 152 cm from secondary to eyepiece... I have a good 25 mm eyepiece and an OK 23 mm that I use primarily. I also have a 4 mm & 10 mm that aren't very functional in my area ( 1 hour west of Philly).
I foresee a trip into lesser radiant areas for better viewing. .............. Thanks for the input. I think it is f5.
Hi again Chris,
I suspect you meant to say "... 100 cm from primary to secondary and 152 mm from secondary to eyepiece...", so that would make the total focal length 1000mm + about 152mm more for approx 1150mm. So with your 25mm eyepiece, 1150mm/25mm gives about 46 power and with a 2x barlow, you would get about 90 power. I recommend you start with a 2x barlow (purchased used here on AstroMart) and use the 1st or 3rd quarter Moon as a first subject. You should see the difference clearly in power on a crater near the light/dark boundary (terminus or terminator).
Good luck - Ed