oldfield 發表於 2012-10-24 14:39:31

FS: CaK filter

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 發表於 2012-10-24 20:35:07

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 發表於 2012-10-24 20:53:44

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 發表於 2012-10-24 21:12:40

Reserved.

oldfield 發表於 2012-10-26 14:24:07

SOLD.
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