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If your budget is a limiting factor, whose isn't I would look at lenses that would be commonly used on most nights and wait to buy the shorter lenses when the budget allows.
As you have a 26/13 (50x/100x) how about a 17/8.5 (73x/146x) which would be a good and useful lense on most nights.
Later on a 10/5 (125x/250x) would be worth a look.
Cheers
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