bvf Posted March 23, 2021 Share Posted March 23, 2021 https://www.ebay.co.uk/itm/Edmund-Optics-Hoya-U-340-UV-50-8mm-Square-Colored-Glass-Bandpass-Filter-46440/124519474964?hash=item1cfdf06714:g:sWsAAOSw1k9f-KBO Link to comment
Andy Perrin Posted March 23, 2021 Share Posted March 23, 2021 That looks like a real Edmund Optics U340 LABEL! Link to comment
Stefano Posted March 23, 2021 Share Posted March 23, 2021 Well, it's not black. It is probably a hot mirror, it looks like it has the typical reddish-pink reflection and greenish-blue transmission. Link to comment
JCDowdy Posted March 23, 2021 Share Posted March 23, 2021 No, obviously wrong filter in the pouch or wrong pouch on the filter. Link to comment
dabateman Posted March 23, 2021 Share Posted March 23, 2021 Looks like they bought a u340 filter. Removed the stock filter from the device and placed it in the sleeve. Then that grad student or postdoc left and someone without knowing what they have is trying to sell it.Thats not uncommon. Edit the description says it all: "This was in a spare parts cabinet of a large factory laboratory overstock sale that I bought from...... I do not know anything about these, but you should!! " Link to comment
Cadmium Posted March 24, 2021 Share Posted March 24, 2021 That is not U-340. U-340 basically looks black, not at all clear. Wrong glass in the wrong pouch/sleeve. Link to comment
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