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Hi Simon, As Bob has suggested, you will get better views of Mars if you have some coloured filters, not just an N/D. These can be purchased singly or in sets. You'll find that the diff. shades avail. will highlight diff. features on the surfaces of all the planets.
Is it possible for you to borrow 3 or 4, from someone on your next Observing night, to see which ones you need before buying?
HTH,
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