I have an 8" Skywatcher dobson. I have some Meade Series 4000 Super Plossl eyepieces that came in a kit (6.4, 9.7, 12.4, 15, 32, 40mm and a 2x barlow) and a 10mm and 25mm eyepiece that came with the telescope. With the upcoming Mars opposition I thought I could use some higher magnification like 300x with a 4mm. So far I was able to see Jupiter nicely at 190x magnification with a 6.4mm EP but only on a few nights. I was wondering if I would be able to pull off 300x magnification on Mars. It will be much higher in the sky than Jupiter but I honestly don't know. The only available eyepiece in Slovakia in my 50€ budget is a Sky-watcher planetary, 4mm. There's also a Binorum Planetary Pro 4mm for 74€.
Is it worth getting or should I be okay with the eyepieces I already have? Will there be any visible improvements in the details of planets if the seeing conditions are good?