First try the Barlow on your 26mm eyepiece. This will get you the equivalent of 13mm, twice the magnification of the 26mm. The advantage of a Barlow is the eye relief, the distance you need to keep your eye away from the eyepiece stays the same.
Then you can try the 9mm, which is approaching my the limit of what your scope can handle.
A 4mm is useless, just provided so the marketing guys can advertise a high magnification.
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Main System:
Amati Futura Mains
Amati Homage VOX Center,
Proac Response 1sc Rears,
Three MC2301's for L,C,R
MC 602 for the rears
C 1100, MX 151, MCD 1100, MR 80
Nottingham Dais with Wave Mechanic
Sumiko Palo Santos Presentation
SurfacePro 3, RPi 4, ROON, WW Starlight Platinum USB, Schiit Yggdrasil, Benchmark DAC3 HGC
MX 151, OppO BDP-95, JVC RS-500 DILA projector, 106" diagonal Stewart Luxus Screenwall Deluxe with Studiotek 130 G3 material.
Lake House:
Ohm F, MC 275V, C2300, MR 77, Rega P3
OnDeck:
McIntosh MAC 4300v
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