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TOPIC: Filter thread

Blobrana

L

Posts: 131433

Date: Jun 14 16:32 2012

Filter thread	Permalink

Spoiler Test of two filters at the extremes of the solar spectrum, a Wratten #25 Red filter and a Calcium-k line ultraviolet filter. Images captured with a 100mm refractor and Vesta pro webcam +Baader solar filter + IR-cut filter. Music generated on an Amiga 1200 __________________

Blobrana

L

Posts: 131433

Date: May 21 07:54 2012

Thread measurements	Permalink

Thread measurements of astronomical Equipment Each manufacturer of astronomical equipment prefers its own special adaptors. This summary is far from being complete (and correct) Read more SCT thread: 2"x24tpi __________________

Blobrana

L

Posts: 131433

Date: Sep 17 15:51 2011

Filter thread	Permalink

Most eyepieces nowadays have threaded barrels to accept filters. Quality diagonals also may have threaded barrels, (which is convenient, as you do not have to swap filters when changing eyepieces). Quality filters should also be 'stackable' allowing two or more(?) filters to be used at the same time. The problem is that there is no real 'industry-standard' size for 1.25" (31.7mm) barrel threads; so the filter threads could either be 28.5 or 28.6mm x 0.6mm pitch, (or even 1.125" x ~44 tpi threads). Things are better with 2" filters which should universally accept 48 x 0.75mm threads. Read more __________________

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