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John, the problem with 4 & 5 mm eyepieces in general is that you will rarely be able to use them. The problem is 'Seeing' conditions usually do not suit these high powered EPs. If you lived out inland at a dark site with really good Seeing, then they might be useful. But your in Brisbane, and i doubt you could ever get a great image out of them there. For most folks a good 9mm EP, like a Televue Nagler is a better investment. You can use it in most conditions and if you ever do run into anazing Seeing you can stick on a 2x barlow to take it to 4,5mm power.
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