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Originally Posted by LT_Ng
Moreover, for this shrinking Mars, I would suggest you shoot it with Powermate 2.5x rather than the low cost 3x barlow.
LT
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I would have thought the same LT, but the experimental results (albeit a very smallsample size) below graphically demonstrate that, when seeing permits, that the greater image amplification of the cheap 3x barlow and ext tube actually gives better detail than the 2.5x powermate all else being equal.
cheers,