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UltravioletPhotography

Greetings from S.Ontario, Canada


GaryR

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Hello, from London, Ontario, Canada.

 

Thanks for accepting my request to the forum.

 

Like many others, I started with bw IR photography, then false-color IR processing, and have spent quite a bit of time with emulations of Kodak EIR film. Although Olympus m4/3 has been my main system, I've added foveon-sensor Sigma cameras, which I find myself using more and more. I'm not sure how well UV will work with foveon, but it's something I'd like to explore further. I expect that it's going to be a while before I can put together a good basic UV system together, and forward to sharing images and learning new techniques.

 

-Gary

 

A couple of UV handheld shots, using a stock Olympus PM1, @ ISO 800

Edited addition:

Olympus E-PM1 unconverted + Panasonic Lumix 20/1.7 + UVoptics Andrea-U filter

Manual WB, f.1.7 for 1/60s @ ISO 800

http://radium.zenfolio.com/img/s/v-3/p2839447902-3.jpg

 

Edited addition:

Olympus E-PM1 unconverted + Panasonic Lumix 20/1.7 + UVoptics Andrea-U filter

Manual WB, f.1.7 for 1/10s @ ISO 800

http://radium.zenfolio.com/img/s/v-3/p2839447916-3.jpg

 

The EIR-like 'reds' are from a FS-converted Sigma DP1x. No filter.

Edited addition:

Sigma DP1x FS-conversion - no filter - SOOC

Manual WB, f/6.3 for 1/100s @ ISO 50

http://radium.zenfolio.com/img/s/v-2/p1716552740-3.jpg

 

Edited addition:

Sigma DP1x FS-conversion - no filter - SOOC

Manual WB, f/4.5 for 1/60s @ ISO 50

http://radium.zenfolio.com/img/s/v-2/p2010273728-3.jpg

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Andy Perrin

Hi! Welcome! The third "EIR-type" image is gorgeous.

 

Those UV shots don't look UV, however, or perhaps they just need white balancing? It is possible they are getting just the high wavelengths (380-400nm region).

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Hi Gary and welcome to UVP. I hope you enjoy our website and find it useful.

 

We just had another Sigma Foveon user join. So it will be interesting and enjoyable to see you and the other Sigma users here discuss these cameras.

 

Typically when we post a photo we provide a brief reference to the camera, lens, filter and illumination along with the exposure data. That helps us better understand your photograph and how it was made.

Example:

Nikon D610-conversion + UV-Nikkor 105/4.5 + BaaderU UV-Pass Filter

In Sunlight, f/11 for 1/25" @ ISO-400

Formatting style of any data is totally your choice, of course. "-)

 

I love that striking red ivy EIR-like photograph. We've just recently had a topic touching on that. It is so much fun!

Link: http://www.ultraviol...-broom-in-b410/

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Thanks for the welcome, Andrea and Andy !

Very cool 'reds' in your Loch Broom shot Andrea ...I'm not familiar with the B410 filter.

All of the older Sigma "DP" series cameras, produce those colors SOOC, when converted to FS.

I've added the exposure data to my original post, and here's a link to my FS DP1x gallery: http://radium.zenfolio.com/p162333544

You're right Andy, the AndreaU filter is in the higher UV range. Here's a short video clip with same camera/filter: http://radium.zenfolio.com/img/s/v-6/o196336254/c1/p2832965030-215.mp4

http://www.uvroptics.com/images/AU_Final_Graph_%20800px.jpg

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Andy Perrin

Yeah, but you are not getting any false color with that, and you should be. The lens may not transmit much UV. The filter is not at issue, many people here use it.

 

Wait, that's with an UNconverted camera? You can't shoot UV with most unconverted cameras (I think there are a few very old ones that can, but they are the exception).

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Yep, it's a stock Olympus E-PM1. Olympus m4/3 digitals seem to have weak UV/IR blocking filters, including my current unconverted Olympus M1.
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Welcome!

 

For laminar sensors such as Foveon, expect to find almost all the UV information in the blue channel (corresponding to the top layer of the sensor.) Other channels may not contain much UV. Do not be surprised if the camera firmware also does strange things, such as causing some channels to drop out completely or making the X3F files unusable. But the cameras do reasonably well for monochrome work if you keep the ISO at 200 or lower. You must remove the hot mirror, of course, but that is trivial in these cameras.

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All of the older Sigma "DP" series cameras, produce those colors SOOC, when converted to FS.

 

Yes, look for our member's posts whose handle is colinbm. He has shown some cool reds also.

 

I really need to look for a Sigma to add to my converted camera group. Getting these reds SOOC would be really fun!


 

With enough patience, enough time, enough ISO and wide enough aperture you can force some UV recording in most unconverted cameras. But it will always be painful. I really could not get anything with my D810 but Nikons have strong UV/IR blocking these days.

 

I'd have to look at the Oly raw file in Raw Digger and then also after a white-click to see how the false colors play out in order to decide whether there is "enough" UV getting through. Photographing a known UV response would help here. Like, do you have a sunflower or rudbeckia photo from this system?

 

I do know from testing that the AndreaU-MkII does not leak IR. :lol:


 

Added later: I LOVE the car shots!!!

 

 

.

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Thanks OlDoinyo ! Sigma surely does have many quirks and and surprises with each new generation, but the ability to image full spectrum, EIR-like images SOOC, is what drew me to the foveon sensor. I currently own a FS-converted 1st gen. DP1, and the latest sd Quattro, so it will be interesting to compare results between the two.

 

Andrea, I have met up with Colin (online), as fellow Sigma addict ! I think he's been at it, longer than I have though. From my experience, the earlier (pre-Merrill) Sigma models are are far easier to set up for EIR-like reds. Any of the older " DP* " models can easily be converted to FS, and produce far better reds and magentas, than later models. SD14/15 dslr's also work fine, but they only have an OVF... no live view !

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I was just yesterday trying to make a color profile and white balance profile for some work from my old D200 and nearly went crazy without Live View! Whew! I've really come to depend on LV.

 

If I had been outdoors with the D200 I would still have had a feel for exposure settings, but I was indoors. And I had to go through a tedious trial-and-error to get the correct exposure. (I was using filters I could not see through in the D200 viewfinder.)

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If you want a true IRG image with a Sigma, you must assemble it from two exposures, as in the following image produced with an SD14 (the forum will not allow me to embed, so here is the link:)

 

http://www.ultraviol...&attach_id=5282

 

This is very much analogous to what the old EIR/Aerochrome emulsions did.

 

If you just want some way of making vegetation look red, that is of course much easier.

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Andrea: I gave up on the SD15 and SD1 Merrill, simply because they don't have LV. Mirrorless is the future!

 

OlDoinyo: I have had a look at the 2-step method, but it's not for me. I do agree that foveon FS doesn't match all EIR color dyes exactly, but I do maintain that I am getting a genuine reflected IR response from healthy (or non-healthy) foliage, in varying shades of red.

 

I took these shots this morning, to illustrate the difference between healthy green foliage and manufactured green objects.

 

Olympus E-M1 + M.Zuiko 25/1.8 | Auto WB | f/1.8 | 1/8000 @ ISO-200

http://radium.zenfolio.com/img/s/v-3/p2842409227-4.jpg

 

Sigma DP1-FS-conversion (no filter), 16.6/4.0 | Custom WB | f/5.0 | 1/320 @ ISO-50

http://radium.zenfolio.com/img/s/v-3/p2842409133-4.jpg

 

One of these is a scan of an Ektachrome CIR 35mm transparency. Can you pick it out ?

http://radium.zenfolio.com/img/s/v-2/p1725441220-3.jpg

 

http://radium.zenfolio.com/img/s10/v102/p1859425067-3.jpg

 

http://radium.zenfolio.com/img/s/v-2/p1724531675-3.jpg

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Love the swan. This photograph looks like it is from a fairy-tale or fantasy story!

 

One of these is a scan of an Ektachrome CIR 35mm transparency. Can you pick it out ?

I can't! But I think I recall reading (perhaps here somewhere) that the pinks happened in some film. Yes?

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