Re: Just got the Nexstar 130 slt and looking for accessories
As everyone has said, hold off on accessories, other than a comfortable observing chair, for a while, especially filters.
I have/had several different alt/az mounts and have improved my goto accuracy by always following this simple routine. When I end a session, I slew the scope to Polaris and then turn it off. When I start a session, I set the scope down pointing roughly (most of the time very close) at Polaris. I use the two star auto align with Polaris as my first star. Then I use a star in the SE or SW 30-60 degrees above the horizon as my second star. I use a reticle EP to precisely center the alignment stars, but defocusing the star to a doughnut will allow you to center easily as well. Obviously you must have the date/time entered correctly and the mount level. I do this with all my goto alt/az mounts with very accurate gotos, the three star alignments have never been as accurate for me.
LX200 ACF 8"SCT(Supercharged), Apertura AD12, Celestron C6A SCT, ES 102CF Apo triplet, ES AR102, ST90, Apex 90mm Mak, ST80(modified), ETX60, Oberwerk 25x100s, 15x70s, 8x56s, Celestron AVX, CG4, LCM, Obie HD Parallel Bino mount, Canon T5, Meade DSI2 Pro, Phillips webcam, Explore Scientific 30mm, 24mm, 18mm, 14mm, 11mm, 6.7mm 82 degree EPs, ES 24mm, 20mm, 16mm 68 degree EPs, Baader 9mm Ortho, Meade 5000 SWA EP set, many more various EPs, Baader Moon&SkyGlow, FringeKiller, SemiApo filters, Celestron UHC, Meade 4000 Nebular Filter, Kson OIII, and lots of astro stuff.