Quite neat for a preview....
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos
Sunday, March 11, 2012
[UV] Animated GIF's from ultraviolet UV videos
Testing how to embed animated UV video GIF's made from UV videos.
Quite neat for a preview....
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos
Quite neat for a preview....
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos
Saturday, March 10, 2012
[UV] Ant on Zinna, video in ultraviolet light
This is from an older UV video, just to see if that would be visible immediately... call it a test.
It is an ant on a Mexican Zinnia, the latter showing a very rare to find 320-340nm reflected UV pattern.
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos
It is an ant on a Mexican Zinnia, the latter showing a very rare to find 320-340nm reflected UV pattern.
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos
Monday, March 5, 2012
[UV] 1930ies Zeiss Jena Quarz Anastigmat f4.5 120mm at work
I was digging through my lens boxes, when that old 1930ies f4.5/120mm Zeiss Jena Quarz Anastigmat lens fell into my hands. So just out of curiosity here a quick shot with it...
[click on image to see a larger one]
It gets pretty obvious when working with such an old lens, that contrast is rather on the low side, some some post processing is needed to enhance contrast and also saturation a bit (which I usually avoid in my work).
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos
[click on image to see a larger one]
It gets pretty obvious when working with such an old lens, that contrast is rather on the low side, some some post processing is needed to enhance contrast and also saturation a bit (which I usually avoid in my work).
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos
Saturday, March 3, 2012
[UV] UV Spring Flowers
Some shots of some early 2012 spring flowers, shot using a special, high UV transmitting lens and a UV sensitive camera. Filter used for the UV shot was the 2" Baader-U filter.
[click on image to see a larger one]
These UV image here also uses my standardized false UV color normal + high intensity palette:
Crocus:
Winter Aconite:
I found it quite interesting how detailed the flower structures are rendered using that lens that reaches down to about 300nm, quite rare actually. That same lens was also used for the shots here where I wanted to show How to avoid IR Leakage
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos
[click on image to see a larger one]
These UV image here also uses my standardized false UV color normal + high intensity palette:
Crocus:
Winter Aconite:
I found it quite interesting how detailed the flower structures are rendered using that lens that reaches down to about 300nm, quite rare actually. That same lens was also used for the shots here where I wanted to show How to avoid IR Leakage
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos
[UV] IR leakage and how to avoid it
One of the most important issues to take care of in reflected UV photography is to avoid IR leakage. Here and example why this is the case.
[click on image to see a larger one]
This left image shows massive IR leakage, whereas the one on the right has none and properly shows the black flower center on this Winter Aconite.
and crocus (which is highly IR reflective) here:
The key is avoiding situations with strong sunlight, using a suitable sunhood and especially using the right UV transmission filter, the new 2" Baader U filter in this case, which has a very good IR suppression up to 1100nm. I had already written about that fact in my article: Principle Thoughts about Lenses + Filters for UV
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos
[click on image to see a larger one]
This left image shows massive IR leakage, whereas the one on the right has none and properly shows the black flower center on this Winter Aconite.
and crocus (which is highly IR reflective) here:
The key is avoiding situations with strong sunlight, using a suitable sunhood and especially using the right UV transmission filter, the new 2" Baader U filter in this case, which has a very good IR suppression up to 1100nm. I had already written about that fact in my article: Principle Thoughts about Lenses + Filters for UV
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos
Tuesday, February 21, 2012
[UV, VIS, NIR] Show the camera sensitivity for UV and IR easily
A have often been asked how one could esily see how deep a converted camera body reaches into UV and/or IR. Using a UV sensitive camera and a special transmission grating, this can indeed be done using two different lightsources, a tungsten lamp and a continuous Xenon lamp.
[click on image to see a larger one]
TUNGSTEN lamp:
top: unfiltered
middle: Baader UV/IR Cut filter
bottom: 695LP long pass filter
XENON lamp:
top: unfiltered
middle1: Baader UV/IR Cut filter
middle2: Baader U2 filter
bottom: 695LP long pass filter
I had previously made a similar test and used some astronomers software (RSpec) to calibrate the results, so here for reference the Xenon spectra (1 Angstrom = 10 nm):
So, that transmission grating I used was not very well suited as it stops working around 360-370nm already, as it is on a normal glass substrate. Maybe I get a better one and repeat the tests sometime...
Be aware that the result does not reflect the absolute sensitivity of the camera sensor, but if using a Xenon source whose spectra is very close to bright noon sunlight (UV and VIs, less so in IR), gives an indication of what to expect when shooting outdoors.
It also reveals, why from 800-850nm onwards only monochrome results in IR can be expected, as all sensor dyes making up the RGB Bayer pattern get transparent.
Another remark: be aware that these spectra are always taken in a way to get them properly exposed, not too high and not too low, so the brightest parts of the spectra determine what is recorded. If only IR or UV is intended, it would be better to shoot through that UV or IR filter and expose these shots accordingly, as in the UV-IR spectra those parts will easily getting lost as they are several stops beyond the visible usually - in case of UV sometimes 8-10 stops!
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos
[click on image to see a larger one]
TUNGSTEN lamp:
top: unfiltered
middle: Baader UV/IR Cut filter
bottom: 695LP long pass filter
XENON lamp:
top: unfiltered
middle1: Baader UV/IR Cut filter
middle2: Baader U2 filter
bottom: 695LP long pass filter
I had previously made a similar test and used some astronomers software (RSpec) to calibrate the results, so here for reference the Xenon spectra (1 Angstrom = 10 nm):
So, that transmission grating I used was not very well suited as it stops working around 360-370nm already, as it is on a normal glass substrate. Maybe I get a better one and repeat the tests sometime...
Be aware that the result does not reflect the absolute sensitivity of the camera sensor, but if using a Xenon source whose spectra is very close to bright noon sunlight (UV and VIs, less so in IR), gives an indication of what to expect when shooting outdoors.
It also reveals, why from 800-850nm onwards only monochrome results in IR can be expected, as all sensor dyes making up the RGB Bayer pattern get transparent.
Another remark: be aware that these spectra are always taken in a way to get them properly exposed, not too high and not too low, so the brightest parts of the spectra determine what is recorded. If only IR or UV is intended, it would be better to shoot through that UV or IR filter and expose these shots accordingly, as in the UV-IR spectra those parts will easily getting lost as they are several stops beyond the visible usually - in case of UV sometimes 8-10 stops!
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos
Friday, February 17, 2012
[UV] Valentine's Day Flower Bouquet
A Valentine's Day flower bouquet - so here it is as it looks like in reflected ultraviolet light. It was shot using my UV sensitive camera and a special, high UV transmitting lens. Filter used for the UV shot was the 2" Baader-U filter and a modified high power Xenon flash was the light source used.
[click on image to see a larger one]
These UV image here also uses my standardized false UV color normal + high intensity palette:
I found it quite interesting how detailed the flower structures are rendered using that lens that reaches down to about 300nm, quite rare actually. That same lens was also used for the primrose shots I have published about earlier
So I wish everyone a belated Happy Valentine's Day!
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos
[click on image to see a larger one]
These UV image here also uses my standardized false UV color normal + high intensity palette:
I found it quite interesting how detailed the flower structures are rendered using that lens that reaches down to about 300nm, quite rare actually. That same lens was also used for the primrose shots I have published about earlier
So I wish everyone a belated Happy Valentine's Day!
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos
Subscribe to:
Posts (Atom)
