Friday, April 23, 2021

Cliff maids - Lewisia cotyledon in reflected ultraviolet photography, simulated bee and butterfly vision VI

Today in 2021 more closeup shots of a pink long blooming, perennial spring flower Cliff maids - Lewisia cotyledon in reflected ultraviolet photography and simulated bee and butterfly vision. All shots were done at f11 in reflected ultraviolet photography using my "work horse" UV filter, the Baader-U filter, as well as my XBV filters for simulated bee and butterfly vision. Lens was a UV-Nikkor 105mm quartz fluorite lens. Light source was Xenon light from my UV enhanced studio flash.

[click on image to see a larger one]

Human vision:
 

Reflected UV:
 

Simulated butterfly vision:
 

Simulated bee vision:
 

Quadriptych of human vision, UV, simulated bee and butterfly vision (left to right, top to bottom):
 

Lewisia has a visible UV pattern, its petal tips are UV bright around 385nm, its center is UV dark, so this gets quite nicely visible, also in simulated butterfly and bee vision.

I have written more about that flower HERE
 
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, April 17, 2021

Apache beggarticks - Bidens ferulifolia in reflected ultraviolet photography, simulated bee and butterfly vision XVIII

Today in 2021 shots of a long blooming spring flower Apache beggarticks - Bidens ferulifolia in reflected ultraviolet photography and simulated bee and butterfly vision. All shots were done at f8 in reflected ultraviolet photography using my "work horse" UV filter, the Baader-U filter, as well as my XBV filters for simulated bee and butterfly vision. Lens was a UV-Nikkor 105mm quartz fluorite lens. Light source was sunlight.

[click on image to see a larger one]

Human vision:
 

Reflected UV:
 

Simulated butterfly vision:
 

Simulated bee vision (new version):
 

Quadriptych (details) of human vision, UV, new simulated bee and butterfly vision (left to right, top to bottom):
 

Bidens has a strong visible UV "bullseye" pattern, its petal tips are UV bright around 365nm, its center is quite UV dark, so this gets quite nicely visible, also in simulated butterfly and bee vision.

I have written about Bidens previously HERE
 
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, April 5, 2021

Cliff maids - Lewisia cotyledon in reflected ultraviolet photography, simulated bee and butterfly vision V

Today in 2021 first closeup shots of a long blooming, perennial spring flower Cliff maids - Lewisia cotyledon in reflected ultraviolet photography and simulated bee and butterfly vision. All shots were done at f11 in reflected ultraviolet photography using my "work horse" UV filter, the Baader-U filter, as well as my XBV filters for simulated bee and butterfly vision. Lens was a UV-Nikkor 105mm quartz fluorite lens. Light source was Xenon light from my UV enhanced studio flash.

[click on image to see a larger one]

Human vision:
 

Reflected UV:
 

Simulated butterfly vision:
 

Simulated bee vision:
 

Quadriptych of human vision, UV, simulated bee and butterfly vision (left to right, top to bottom):
 

Lewisia has a visible UV pattern, its petal tips are UV bright around 385nm, its center is UV dark, so this gets quite nicely visible, also in simulated butterfly and bee vision.

I have written more about that flower HERE
 
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 21, 2021

Moth orchid - Phalaenopsis in reflected ultraviolet photography and simulated butterfly and bee vision using a UV-Nikkor 105mm lens II

Today in March 2021 studio shots of a decorative flower, Moth orchid - Phalaenopsis in reflected ultraviolet photography using my "work horse" UV filter as well as simulated bee and butterfly vision  shot with my "work horse" UV-Nikkor f4.5/105mm quartz fluorite lens. UV filter used was the Baader-U filter, my "work horse" filter for reflected UV as well as my proprietary XBV filters for simulated bee and butterfly vision. All shots were done at f11. Light source used was a modified for high UV output Xenon flash. I have additionally used a 365nm UV LED for better focusing.

[click on image to see a larger one]

Human Vision (VIS):
 

Reflected UV (Baader-U):
 

Simulated Butterfly Vision:
 

Simulated Bee Vision:
 

Quadriptych of human vision, UV, simulated butterfly and bee vision (left to right, top to bottom):
 

This orchid has not a very specific UV pattern, its petals are UV reflective around 380nm, but its middle tip (column and gymnostemium) have a rather UV bright spot reflecting around 370nm which gets nicely visible.

The UV-Nikkor 105mm lens is known to be a very well working one, with a nice close up 1:2 focus capability from infinity up to 48cm (0.48 meter). Sharpness is very good and so is contrast, even from f4.5 onwards. With a Nikon PN-11 extension tube of 52.5mm length it reaches 1:1 (1x) magnification. It has the standard Nikon-F mount, and it covers full format sensors (41mm image diameter). It is defined to reach down to 190nm and up to 1300nm in near infrared; my measured transmission spectra of it may be seen here.

I have written more about this orchid HERE

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

Oncostele Wildcat 'Golden Red Star' in visible, reflected UV, simulated bee and butterfly vision using a UV-Nikkor 105mm lens V

Today in March 2021 even more shots of an Orchid hybride, Oncostele Wildcat 'Golden Red Star' in reflected ultraviolet photography as well as simulated bee and butterfly vision  shot with my "work horse" UV-Nikkor f4.5/105mm quartz fluorite lens. UV filter used was the Baader-U filter, my "work horse" filter for reflected UV as well as my proprietary XBV filters for simulated bee and butterfly vision. All shots were done at f11. Light source used was a modified for high UV output Xenon flash. I have additionally used a 365nm UV LED for better focusing.

[click on image to see a larger one]

Human Vision (VIS):
 

Reflected UV (Baader-U):
 

Simulated Butterfly Vision:
 

Simulated Bee Vision:
 

Quadriptych of human vision, UV, simulated butterfly and bee vision (left to right, top to bottom):
 

This orchid has a very specific UV pattern, its petals are very UV dark, but its lower petal lip shows on the lower center a very UV bright spot which gets nicely visible.

PS: The San Diego Botanic Garden will in their "World of Orchids" show April 3 - May 2, 2021 display these Oncostele "Wildcat" multispectral images, to explain how orchids and pollinators interact.

The UV-Nikkor 105mm lens is known to be a very well working one, with a nice close up 1:2 focus capability from infinity up to 48cm (0.48 meter). Sharpness is very good and so is contrast, even from f4.5 onwards. With a Nikon PN-11 extension tube of 52.5mm length it reaches 1:1 (1x) magnification. It has the standard Nikon-F mount, and it covers full format sensors (41mm image diameter). It is defined to reach down to 190nm and up to 1300nm in near infrared; my measured transmission spectra of it may be seen here.

I have written more about this orchid HERE

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

Wednesday, March 10, 2021

Oncostele Wildcat 'Golden Red Star' in visible, reflected UV, simulated bee and butterfly vision using a UV-Nikkor 105mm lens IV

Today in March 2021 more shots of an Orchid hybride, Oncostele Wildcat 'Golden Red Star' in reflected ultraviolet photography as well as simulated bee and butterfly vision  shot with my "work horse" UV-Nikkor f4.5/105mm quartz fluorite lens. UV filter used was the Baader-U filter, my "work horse" filter for reflected UV as well as my proprietary XBV filters for simulated bee and butterfly vision. All shots were done at f8. Light source used was a modified for high UV output Xenon flash. I have additionally used a 365nm UV LED for better focusing, (which unfortunately has influenced the white balance somewhat, in case you wonder).

[click on image to see a larger one]

Human Vision (VIS):
 

Reflected UV (Baader-U):
 

Simulated Butterfly Vision:
 

Simulated Bee Vision:
 

Quadriptych of human vision, UV, simulated butterfly and bee vision (left to right, top to bottom):
 

This orchid has a very specific UV pattern, its petals are very UV dark, but its lower petal lip shows on the lower center a very UV bright spot which gets nicely visible.

The UV-Nikkor 105mm lens is known to be a very well working one, with a nice close up 1:2 focus capability from infinity up to 48cm (0.48 meter). Sharpness is very good and so is contrast, even from f4.5 onwards. With a Nikon PN-11 extension tube of 52.5mm length it reaches 1:1 (1x) magnification. It has the standard Nikon-F mount, and it covers full format sensors (41mm image diameter). It is defined to reach down to 190nm and up to 1300nm in near infrared; my measured transmission spectra of it may be seen here.

I have written more about this orchid HERE

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

Oncostele Wildcat 'Golden Red Star' in visible, reflected UV, simulated bee and butterfly vision using a Jenoptik CoastalOpt® UV-VIS-IR 60 mm 1:4 APO Macro lens III

Today in March 2021 more shots of an Orchid hybride, Oncostele Wildcat 'Golden Red Star' in reflected ultraviolet photography as well as simulated bee and butterfly vision - but with a quite different lens, the Jenoptik CoastalOpt® UV-VIS-IR 60 mm 1:4 APO Macro quartz fluorite lens, which is on the scientific lens market for a few years now. UV filter used was the Baader-U filter, my "work horse" filter for reflected UV as well as my proprietary XBV filters for simulated bee and butterfly vision. All shots were done at f8. Light source used was a modified for high UV output Xenon flash. I have additionally used a 365nm UV LED for better focusing, (which unfortunately has influenced the white balance somewhat, in case you wonder).

[click on image to see a larger one]

Human Vision (VIS):
 

Reflected UV (Baader-U):
 

Simulated Butterfly Vision:
 

Simulated Bee Vision:
 

Quadriptych of human vision, UV, simulated butterfly and bee vision (left to right, top to bottom):
 

This orchid has a very specific UV pattern, its petals are very UV dark, but its lower petal lip shows on the lower center a very UV bright spot which gets nicely visible.

This 60mm lens is a rather well working one, with a nice close up focus capability from infinity up to 26cm (0.26 meter). Sharpness is quite good and so is its contrast, even wide open. It has a transmission waveband of 290nm - 1500nm and is apochromatic from 315nm - 1100nm. It is had an advanced broadband BBAR coating which increases transmission considerably and reduced flares; my measured transmission spectra of it may be seen here. It has a standard Nikon-F mount, and covers full format sensors (41mm diagonal). There have been reports of a UV hotspot, but the solution to it has been found by using a tight sunshade.

I have written more about this orchid HERE

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

Oncostele Wildcat 'Golden Red Star' in visible, reflected UV, simulated bee and butterfly vision using a Lavision 85mm lens II

Today in March 2021 again shots of an Orchid hybride, Oncostele Wildcat 'Golden Red Star' in reflected ultraviolet photography as well as simulated bee and butterfly vision - but with a quite different lens, the LAVISION f2.8/85mm quartz fluorite lens, which is rather new on the scientific lens market. UV filter used was the Baader-U filter, my "work horse" filter for reflected UV as well as my proprietary XBV filters for simulated bee and butterfly vision. All shots were done at f8. Light source used was a modified for high UV output Xenon flash. I have additionally used a 365nm UV LED for better focusing, (which unfortunately has influenced the white balance somewhat, in case you wonder).

[click on image to see a larger one]

Human Vision (VIS):
 

Reflected UV (Baader-U):
 

Simulated Butterfly Vision:
 

Simulated Bee Vision:
 

Quadriptych of human vision, UV, simulated butterfly and bee vision (left to right, top to bottom):
 

This orchid has a very specific UV pattern, its petals are very UV dark, but its lower petal lip shows on the lower center a very UV bright spot which gets nicely visible.

This 85mm lens seems to be a rather well working one, with a nice close up focus capability from infinity up to 40cm (0.4 meter). Sharpness is quite good and so is contrast, if stopped down to at least f4.5 that is. It has a standard Nikon-F mount, but only covers about APS-C format (approx. 30mm diameter) as it was designed to be used on amplified cameras, which usually require 25mm image diameter. It is defined to reach down to 200nm; my measured transmission spectra of it may be seen here.

I have written more about this orchid HERE

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

Wednesday, February 17, 2021

A few quartz flourite UV lenses on the bench for lens transmission measurements II

A few years ago I was taking transmission measurements of some special quartz-fluorite lenses for reflected UV photography. This included the then Coastal Optics UV-VIS-NIR Apo 60mm lens, after the merger now called Jenoptik CoastalOpt® UV-VIS-IR 60 mm 1:4 APO Macro. 

So since I just recently bought that CoastalOpt® lens, I measured it (amongst others) with my newer spectrometric setup and compared my results with their published data. Surprisingly enough, my older and newer measurements of that CoastalOpt® 60mm Apo lens correlate very well - but not with their now officially published data on their site which shows much lower transmission values. Their formerly published data however showed much better spectral transmission, which correlated well with my own measurements.

[click on image to see a larger one]

Here in comparison the former (white) and now published data (magenta) superimposed:

My own measurements back then were these (amongst some other lenses):


[validity: approx 310 - 750nm]

and my newer current measurements (reaching deeper into UV) are these:

[validity: approx 300 - 750nm]

The differences in transmission of both my measurements are rather small. It is beyond my understanding how these new and quite different measurements (about 20% less) happened; I am just wondering why such an excellent lens is not represented well enough....

I have written about this lens before HERE.

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 12, 2021

Lens Transmissions of specialized Lenses for reflected UV Photography II

So today more about some UV-VIS-NIR measurements of some highly specialized lenses, which were specifically developed for reflected ultraviolet (UV) photography. This time it is about lenses with 85mm focal length.

Usually a photographic lens should reproduce visible images, which is the wavelength band of about 400-700nm. This is why lens makers apply a special multicoating (aside from achieving higher light transmission), which usually blocks light outside this visible waveband. For biological reflected UV photography however, the UV-A band (300 - 400nm) is the interesting one. So using such a modern UV lens and that (de facto "standard" UV transmitting) Baader U-filter  will work very well together, if both lens + filter have a high enough transmission. Culprit is, that coating for such a wide range is tricky, so quite a few of those lenses are still uncoated.

Here now I have used my UV-VIS-NIR spectrometer system consisting of a stabilized Xenon light source connected with a quartz fiber to a quartz-fluorite condensor which generates a fine parallel output ray shining through the lens to be tested and a receiving Spectralon (R) coated integrating sphere which captures all the light of that diverging beam exiting the measured lens and transmits this via a quartz fiber to the digital spectrometer.

The following lenses have been measured (links lead to my macrolenses site with lens data):

- Quartz Takumar f3.5/85mm (M42 mount)

- Ultra Achromatic Takumar f4.5/85mm (M42 mount)

- Lavision f2.8 / 85mm UV (Nikon-F mount)

 [click on image to see a larger one]

 

All these lenses show a relatively high UV transmisison, the Quartz Takumar 85mm especially. The Ultra Achromatic Takumar 85mm and Lavision 85mm are not only suitable for UV-A photography for biologic studies (which usually is the 300-400nm UV-A range), but for technical studies like combustion analysis etc. which demands a suitable transmission in the UV-B (also sometimes UV-C) range, which all these three lenses are capable of, reaching down to about 200nm. 

The Ultra Achromatic Takumar 85mm shows some notable dip in transmission around 360-370nm, but I have no explanation for this yet - possibly caused by impurities of the used CaF2 cystals. All these three lenses seem to be uncoated. The Quartz Takumar 85mm is not color corrected, so shows quite some focus shift depending on wavelength; reason why it was shortly on the market only and replaced by the Ultra Achromatic Takumar 85mm, which is a color corrected quartz fluorite lens with very little focus shift.

The Lavision 85mm covers APS-C format. The Quartz Takumar 85mm and Ultra Achromatic Takumar 85mm are full format lenses. The latter two lenses are no longer made, but available on the used market; the Lavision 85mm lens is available from stock.

Just a remark, as a high UV transmission is a must for a suitable UV lens, but also good sharpness, high contrast, flare resistance, no hot-spots, etc. are requirements such a UV lens has to meet, and I have not jet mentioned an important point - focus shift. Most of these modern quartz-fluorite lenses have no or very little focus shift, but that depends on the wavelength range they are corrected for. 

I have written about other such lenses HERE

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 9, 2021

If you like to see some of my works on display in 2021

 So if you would like to see some of my work (updated March 2021)...

...and if you live in Europe, then you have a chance to see some here:

The artist Dr Andrea Daisy Ginsberg will give a talk about the Eden Project, Cornwall, UK in Rappertwil, Switzerland in March 2021 using some of my multispectral flower images to illustrate the difference in perception of colour by different pollinator species.

The Gallery Oldham in Oldham, UK (greater Manchester area) will in 2021 include some of my Caltha palustris (Marsh marigold) simulated bee vision images in a presenation about pollinators.

... and if you live in North America, then you have a chance to see some here:

The San Diego Botanic Garden will give in 2021 a presentation about the difference in our vision and pollinator vision and how this has helped orchids evolve into what they are, using some of my multispectral works on orchids.

The Witte Museum in San Antonio, Texas wil give a presentation on pollinators using some of my multispectral works.

The Butterfly Conservation Club of the Southeast Michigan Butterfly Association will in February 2021 have a presenation about butterfly and plant interactions using some of my simulated butterfly and human vision images.

... and if you live in Asia, then you have a chance to see some here : 

Jurong Lake Gardens' Therapeutic Garden - Butterfly Maze in Singapore's Jurong Lake Garden will show in 2021 some of my simulated butterfly vision images, to demonstrate the difference betwen what we see and what butterflies see.

An overview of my works on display may be found HERE

My work for Movies and TV may be found HERE

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, January 31, 2021

Lens Transmissions of specialized Lenses for reflected UV Photography

So today my first post in 2021 about some UV-VIS-NIR measurements of some highly specialized lenses, which were specifically developed for reflected ultraviolet (UV) photography.

Usually a photographic lens should reproduce visible images, which is the wavelength band of about 400-700nm. This is why lens makers apply a special multicoating (aside from achieving higher light transmission), which usually blocks light outside this visible waveband. For biological reflected UV photography however, the UV-A band (300 - 400nm) is the interesting one. So using such a modern UV lens and that (de facto "standard" UV transmitting) Baader U-filter  will work very well together, if both lens + filter have a high enough transmission. Culprit is, that coating for such a wide range is tricky, so quite a few of those lenses are still uncoated.

Here now I have used my UV-VIS-NIR spectrometer system consisting of a stabilized Xenon light source connected with a quartz fiber to a quartz-fluorite condensor which generates a fine parallel output ray shining through the lens to be tested and a receiving Spectralon (R) coated integrating sphere which captures all the light of that diverging beam exiting the measured lens and transmits this via a quartz fiber to the digital spectrometer.

The following lenses have been measured (links lead to my macrolenses site with lens data):

- CoastalOpt (Jenoptik) f4 / 60mm UV-VIS-NIR Macro Apo (Nikon-F mount)

- UV-Nikkor f4.5 / 105mm (Nikon-F mount)

 (identical to the RAYFACT f4.5 105mm sold by Nikon TOCHIGI)

- Lavision f2.8 / 85mm UV (Nikon-F mount)

- Hamamatsu A4869 f3.5 / 50mm (c-mount)

 [click on image to see a larger one]

All these lenses show a rather high UV transmisison, the CoastalOpt 60mm especially, as it seems to have a modern BBAR coating, but its downside is that its transmission only starts from about 320nm onwards, suitable for UV-A photography for biologic studies, but less suitable for technical studies like combustion analysis etc. which demands a suitable transmission in the UV-B (also sometimes UV-C) range which the other three lenses are capable of, reaching down to about 200nm.

The Hamamatsu 50mm is a c-mount lens and covers 1" sensors, the Lavision 85mm covers APS-C format. UV-Nikkor 105mm and CoastOpt 60mm are full format lenses.

Just a remark, as a high UV transmission is a must for a suitable UV lens, but also good sharpness, high contrast, flare resistance, no hot-spots, etc. are requirements such a UV lens has to meet, and I have not jet mentioned an important point - focus shift. Most of these modern quartz-fluorite lenses have no or very little focus shift, but that depends on the wavelength range they are corrected for. 

There ia a part II of this covering 85mm lenses for UV HERE

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