We　simulated　transmission　of　7-keV　Ne7+　ions　through　untilted　mica　capillaries　to　study　the　influence　of　the　image　charge　attraction.　In　simulations,　the　repulsive　interaction　of　incident　ions　with　the　charges　accumulated　on　the　capillary　surface　was　also　considered.　The　capillaries　used　have　various　regular　polygonal　cross　sections.　Our　results　clearly　show　that　the　image　attraction　greatly　reduces　the　ion　transmission.　Moreover,　the　shaping　effect,　already　reported　previously,　is　also　reproduced.　For　a　regular　polygonal　shaped　capillary　the　transmitted　angular　distribution　remains　regular　polygonal,　but　its　orientation　with　respect　to　the　capillary　differs　by　some　angle.　An　analytic　model　calculation　was　conducted　to　describe　the　reduction　of　the　image　attraction　on　the　transmitted　ion　fraction　through　the　untilted　capillary,　agreeing　well　with　the　simulated　results.　The　reducing　effect　of　the　image　attraction　on　ion　transmission　was　found　to　be　strong　for　the　combination　of　low-energy　ions　and　capillaries　with　large　aspect　ratios　(length/diameter).　©　2022　Elsevier　B.V.