Umwobo w'imbere wumupira wo hanze wikurikiranya ni umwobo wa taper hamwe na tapi 1:12, ushobora gushyirwaho muburyo butaziguye, cyangwa ubifashijwemo nigiti gihamye cyashyizwe kumutwe wa optique udafite umurongo, kandi urashobora guhindura imyanda. .
Nubwoko bwo gutwara ibintu buhuza ibizunguruka hamwe na podiyumu.Ibyinshi mu bizunguruka ni ikigo gifata impeta yinyuma ya diametre yinyuma yumuzingi, hamwe numwobo wimbere wimbere wamazu yimyubakire yashyizwe hamwe, imiterere yuburyo iratandukanye, kwisi yose kandi ihinduranya neza.