定焦鏡頭C接口間隔環套件

若工作距離很長，大多數鏡頭很難在機台平台上調整到較小的視場，大都會產生大於所需的視場。間隔環透過縮短最小工作距離和增加放大倍率進而減小視場，解決了這些問題。C接環延伸鏡筒套件包括0.5mm、1mm、兩個5mm、10mm、15mm和40mm間隔環。

TECHSPEC® Fixed Focal Length Lens C-Mount Spacer Kits provide spacers for decreasing field of view and reducing working distances of standard fixed focal length lenses. The C-Mount Extender Kit includes 0.5mm, 1mm, (2) 5mm, 10mm, 15mm, and 40mm spacers. Decreasing working distance by adding spacers forces the lens to focus at distances that are generally outside their designed working distance, which can cause increased distortion, chromatic and spherical aberrations, reduced depth of field, illumination non-uniformity, and decreased light-gathering ability. C-Mount Extension Tubes and Brass Spacers are also sold separately.