FS: CaK filter

oldfield

Acquired from ebay from a non-astronomical filter manufacturer, narrower bandwidth than Baader CaK.

Mounted in a C-mount cell, together with a 77mm blue filter serving as an ERF.  

This combination must be used with a Baader filter.

Asked for $500 HKD only, sample shots:

riricky815

新手好奇問下甚麼叫Mounted in a C-mount cell, together with a 77mm blue filter serving as an ERF.

oldfield

塊 filter 接口係 C-mount, 好多 CCTV 或者工業用 video camera 都係呢種接口

ERF = Energy Rejection Filter.

oldfield

Reserved.

oldfield

SOLD.