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Like Meyer Trioplan ... but so much cooler

Infrared Multispectral UV Camera UV Lens SWIR
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#21 SteveCampbell

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Posted 01 September 2018 - 10:49

View PostUlfW, on 01 September 2018 - 10:00, said:


That is what I suspected.

I have bought some filters from Image-Laboratory too, for less sensitive tasks.
The two filters ordered as "BG38", 52mm and 77mm, has a rather different transmission, neither close to the real Schott BG38 curve.
The "Real BG40" was close to one of the "BG38" above and more like a correct BG40.
Their eBay offerings are full of technical errors about UV-photography too.

If your "BG39" is something like a BG40 instead and the "UG11" behaves like a real UG11 you will have an OD3 IR leakage at 700nm.
I think that a stack transmission like that could give you that kind of image colours.

From an artistic point of view these UV+IR based images can be quite interesting and pleasing, by adding a new interesting dimension to the image.

That makes a great deal of sense with what I'm seeing. Perhaps somewhere down the line I'll get my hands on a proper 77mm stack if there's an accessibly priced S8612 in that size. In the meantime I'll enjoy the character of these leaky versions.

Thanks Ulf!
STEVE CAMPBELL
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#22 Andy Perrin

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Posted 01 September 2018 - 15:25

I have some dodgy BG39 also. It was bundled with my camera so at least I didn’t pay for it.