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UltravioletPhotography

Ebay find - Schott OG570 in 52mm filter


JMC

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Having an eBay browse at the weekend, and found this OG570 filter (excuse the slightly shaky picture - too much coffee today I think).

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The vendor was a second hand photographic equipment seller, and all he knew about it was that it had been made by a company called Mason Vactron for forensics work. As it was threaded in 52mm (and was only £20 including delivery) I thought 'why not'. It turned up today and I've run a transmission test on it.

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Looks pretty good to me, I don't think it got used much. Apparently Mason Vactron were dissolved in 2016, but from the directors list I'm guessing they are now Freeman and Foster, who are a big forensics manufacturer here in the UK.

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Quick trip to Kew Gardens in London today. Sun was out for, oooh, about 10mins (that's good for Britain) for the entire time we were there. Anyway, did get a few shots - Monochrome EOS 5DSR, with 40mm pancake lens and Schott OG570 filter for all of them. Some of them have been cropped and the contrast upped slightly.

 

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Schott OG550 is what B+W 099 is made from,. they are the same, at the same thickness of course. Is there a thickness shown on your filter?

Thickness is usually not that critical, especially with non stacked longpass filters, but will change the cut off point slightly.

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  • 2 weeks later...

Bit of an update on this one. Turns out the vendor I got the filter from specialises in used forensics equipment, and he had a load more filters - 3 more from Mason Vactron (OG550, GG495, and GG455, all marked up as Schott), and 5 by a different company called Quaser. The Quaser ones are marked up a bit differently, not with the glass type, but by where they reach 1% transmission (415, 476, 510, 549 and 593nm). All in 52mm mounts. So I made an offer, and got what he had left. Here are the filters and the transmission spectra (all spectra measured on a Perkin Elmer Lambda 650S UV-Vis spectrometer with a 150mm integrating sphere, between 250nm and 800nm, 1s collection time per nm;

 

Mason Vactron filters

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Quaser filters

post-148-0-20948700-1507293428.jpgpost-148-0-62414600-1507293436.jpg

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