colinbm Posted January 22, 2015 Share Posted January 22, 2015 Wow, Sigma Foveon really does the funk B)I went out into the yard today & picked a couple of flowers to expose to some UV light in my studio, as I now have two, MTE U301 365nm LED lights.I started on the Allamanda Flower, which I have exposed to varying UV doses before, but this time was the first with UVIVF.Well isn't this something to behold......... Lighting is one, MTE U301 365nm LED flashlight, with a U340 filter to keep the lighting under 400nm.Taken with a Sigma DP2 ASP-C compact camera, with the original IRC & a GG420 filter to keep the camera's response above 420nm. Settings were: ISO 100, f5 at 8 seconds.CheersCol Link to comment
Andrea B. Posted January 22, 2015 Share Posted January 22, 2015 Wow !! This is indeed very cool. Col, would you please comment on how close the photo colours came to matching the colours you were seeing?Also, were you photographing in the darkness?Thanks. B)(That's not a critique of methodology. Rather, we need to record all experimental details so that such an experiment can be fully understood and possibly repeated by others, if desired.) Link to comment
colinbm Posted January 22, 2015 Author Share Posted January 22, 2015 Thanks AndreaIt is brighter then what I saw, but the colours were there. I was surprised when I saw the RAW image, so I went back & checked.Yes it was taken in a darkened room, lit with the MET 365nm LED with a U340nm filter to be sure.I'll do a multi-spectral triptych next.Col Link to comment
Damon Posted January 23, 2015 Share Posted January 23, 2015 That is quite something Col. Nice work! -D Link to comment
colinbm Posted January 23, 2015 Author Share Posted January 23, 2015 Thanks DamonIt is a lot easier to do UV photography, now that I have some good UV light B)Col Link to comment
Damon Posted February 3, 2015 Share Posted February 3, 2015 Col, where are you getting your MTE light? Link to comment
colinbm Posted February 3, 2015 Author Share Posted February 3, 2015 Hi DamonThere is a USA seller, http://shop.gregmcge...shlight-019.htmThere is an Australian seller, http://www.urbanoutb...light-36/MTE-UVIf you are not in a hurry, the Australian dollar is down against the greenback & you can get it for less than USD150 + postage to USA, at the moment.Col Link to comment
Damon Posted February 3, 2015 Share Posted February 3, 2015 Who's Danon? :) So does it have threads so the Badder U can be put on it or do you just tape it on there? Thanks,-D Link to comment
colinbm Posted February 3, 2015 Author Share Posted February 3, 2015 If you didn't put the n & the m so close together on the keyboard.......... :) You could use the Baader U on this lamp, it is pretty well close to UV at 365nm only, no IR. But avoid getting the coated surface of the Baader U in contact with the end of the flash-light.I do use a U340 filter for UVIVF photography, to keep the light below 400nm. The cover glass is 36mm diameter.You can buy a 40.5mm U340 filter from http://www.ebay.com.au/itm/Hoya-U-340-40-5mm-x-2mm-UV-Pass-Filter-Ultraviolet-Dual-Band-IR-for-El-Nikkor-/291207045396?pt=LH_DefaultDomain_0&hash=item43cd4ae114but you will need to carefully grind the diameter down to 36mm.Col Link to comment
Damon Posted February 12, 2015 Share Posted February 12, 2015 Do you suspect I would need that filter since the LED is pretty close to 365? Were you able to measure the light wavelength? Re:to keep below 400Does that mean you suspect it goes beyond 400 or are you just eliminating variables? Thanks so much, -D Link to comment
colinbm Posted February 12, 2015 Author Share Posted February 12, 2015 Hi DamonThe MTE U301 365nm LED lamp is a quality product & is on band with its wavelength.http://www.nichia.co.jp/specification/products/led/NCSU033B-E.pdf see page 11.Because this LED is very bright, the minute visible spill into blue is bright white to the eye. I like to eliminate this from the digital sensor & therefore the final image, especially in UVIVF photography.The eBay seller 'uviroptics', will be selling a replacement for the clear glass reflector cover with UG11 or U340 filter glass.At the moment I have an adapter that can hold the 52mm filters in front of the lamp. I have five of these MTE UV lamps that I will filter.CheersCol Link to comment
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