Surprising STEINHEIL f2.8/50mm lens for reflected UV photography VII - Focus Shift

This again is about this older 50mm lens, which was made decades ago by famous lens maker STEINHEIL which attracted me, since it showed some seemingly good UV transmission, which have already shown here. I have already shown that it performs quite well using the Baader-U filter, and using some even deeper reaching UV filters, using a 340nm shortpass and the IDAS 330nm filter (I have the 2" version, no longer made).

Now I wanted to show today how the focus shift of this, or any other lens can be easily made visible. All images shot at f8, using a modified Xenon flash.

[click on image gets you a larger image]

VIS image using UV/IR Cut filter:
 

UV image using Bader-U filter (approx. 320-390nm, peak 360nm):
 

UV image using IDAS UV filter (approx. 300-380nm, peak 330nm):
 

UV image using 340nm UV filter (approx. 320-340nm):
 

Now it is about to show how those images differ in size, using a method I call "differential", i.e. a subtraction of two images, one visible and one UV, where any focus shift will show as overlapping on the borders of the object. If you looks close you will see this around the object.

VIS-UV (Baader-U filter) differential image:
 

VIS-UV (IDAS UV filter) differential image:
 

VIS-UV (340nm UV filter) differential image:
 

It got quite obvious before, that this lens is also performing very well at even shorter wavelengths, making it a very useful lens for reflected UV down to 330-340nm at an optimal f8/f11 setting, especially since the image size deviation between visible and UV image is also only 1.3% , which can be easily seen (and measured) from those differential images.

I have written about that lens more 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

Surprising STEINHEIL f2.8/50mm lens for reflected UV photography IV

I had mentioned in my previous thread, that a few years ago I got an older lens, which was made decades ago by famous lens maker STEINHEIL . It is a possibly single coated, well made 2.8/50mm lens which attracted me, since it showed some seemingly good UV transmission when shining an 365nm UV LED beam through it. The surprise came when I had it under my spectrometer, revealing its high and deep reaching UV transmission.  I have already shown that it performs quite well using the Baader-U filter, and here now its performance using some even deeper reaching UV filters, using a 340nm shortpass and the IDAS 330nm filter.

[click on image gets you a larger image]

VIS image using UV/IR Cut filter:
 

UV image using IDAS UV filter (approx. 330-370nm) at f5.6:
 

UV image using IDAS UV filter (approx. 330-370nm) at f8:
 

UV image using IDAS UV filter (approx. 330-370nm) at f11:
 

UV image using IDAS UV filter (approx. 330-370nm) at f16:
 

UV image using 340nm UV filter (approx. 320-340nm) at f5.6:
 

UV image using 340nm UV filter (approx. 320-340nm) at f8:
 

UV image using 340nm UV filter (approx. 320-340nm) at f11:
 

UV image using 340nm UV filter (approx. 320-340nm) at f16:
 

VIS and UV (IDAS) image side-by-side both at f8:
 

VIS and UV (340nm) image side-by-side both at f8:
 

As I had mentioned before, it got pretty clear that this lens has a very high UV performance, as at 365nm it transmits around 75%. Its peak transmission with Baader-U filter attached is around 68% at 360nm. At shorter wavelengths it still has a very useful 56% transmission at 340nm and 22% at  320nm.

Before I had shown here, that stopping down has improved sharpness significantly, especially in reflected UV light using the Baader-U filter. Now it gets quite obvious, that this lens is also performing very well at even shorter wavelengths, making it a very useful lens for reflected UV down to 330-340nm at an optimal f8/f11 setting, especially since the image size deviation between visible and UV image is also only 1.3% there .

I have written about that lens more 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

[UV, VIS, IR] Lyman Alpha deep UV lenses IV - Oncostele orchid

Today tests shots of a Orchid hybride (Oncostele Wildcat 'Golden Red Star') in reflected ultraviolet photography with a NYE OPTICAL Lyman-Alpha II f1.1/90mm UV-VIS-NIR lens in comparisoon with my UV-Nikkor 105mm lens. UV filters used was the Baader-U and the IDAS 340nm filter for the UV-Nikkor and a UV transmitting stack of UG11+S8612 as well as a 340nm filter for the Lyman Alpha 90mm, both rear mounted. All shots were done at f4.5 for the UV-Nikkor resp. f1.1 as the Lyman Alpha lens has no iris. Light source used was Xenon flash.

[click on image to see a larger one]

UV-Nikkor 105mm Visible Light:
 

UV-Nikkor 105mm Baader-U filter:
 

UV-Nikkor 105mm Baader-U filter (whitebalanced):
 

UV-Nikkor 105mm 340nm IDAS filter:
 

Lyman Alpha II 90mm UG11+S8612 filter:
 

Lyman Alpha II 90mm UG11+S8612 filter (whitebalanced):
 

Lyman Alpha II 90mm 340nm filter:
 

UV-Nikkor vs Lyman Alpha II 90mm in UV:
 

UV-Nikkor vs Lyman Alpha II 90mm in UV (whitebalanced):
 

UV-Nikkor vs Lyman Alpha II 90mm in UV (340nm):
 
This orchid has a very specific UV pattern, its petals are very UV dark, but its lower petal lip has on the lower center a very UV bright spot as well as on its center "nose" formation an UV reflecting spot and all this gets nicely visible.

Both lenses are very different animals so to speak, that Lyman Alpha II f1.1/90mm has extremely shallow DOF as compared to the f4.5 / 105mm UV-Nikkor lens, as well as some bent field, but it shows a very useful UV transmission. That rear mounted 340nm seems not to be the clearest filter, as the resulting image was a bit cloudy, not the fault of the lens.

I have written about the Nye Lyman-Alpha lenses previously HERE and 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

Deep UV Ultraviolet Reflected Light Photography at UV-B and UV-C recording with candle light

Today another proof that reflected UV photography is doable at UV-B and UV-C using several special, up to NIR blocked, narrowband filters and a very different UV camera, an amplified 190-650nm MCP equipped video camera. Lens used was a CERCO f1.8/45mm quartz flourite lens. Light source was a candle flame.

[click on image to see a larger one]

This reveals, that the deeper one looks into UV, the area where the candle flame emits that UV moves from the top of the flame down to the sides of the flame. Pretty amazing how sensitive this type of camera is, as the needed amplification was still just in the lower 30% of the total available range.

I have a newer system HERE with a normal camera attached to the MCP amplification device.

I have previously written more about combustion and UV HERE.

Btw. Michael Faraday has in 1848 given six famous lectures about the chemical history of the candle, which may be read about HERE

Stay tuned, more will follow on that fascinating subject...

Shikoko Cobra Lilly - Arisaema sikokianum in reflected ultraviolet photography and simulated bee vision II

Today more shots of that rare early spring flower, common in Japan at Shikoko island, Shikoko Cobra Lilly - Arisaema sikokianum. in reflected ultraviolet photography and simulated bee vision. All shots were done at about f5.6 in reflected ultraviolet photography using my "work horse" UV filter, the Baader-U filter, as well as my XBV6 filter for simulated bee vision. Further for deeper UV, a 340nm short pass filter was used, stacked to the Baader-U filter. Lens was a CERCO 94mm quartz fluorite lens. Light source was sunlight.

I had mentioned before that I noticed some UV lighting around 340nm which caught my attention and here it is about that.

[click on image to see a larger one]

Triptych of human vision, UV and simulated bee vision (left to right):
 
Triptych of human vision, UV and deep UV below 340nm (left to right):
Triptych of human vision, UV and simulated bee vision (left to right):
 
Triptych of human vision, UV and deep UV below 340nm (left to right):

This Cobra Lilly flower has are extremely UV bright cup around 370nm, with parts drifting towards 380nm. Further to that, deeper UV photography below 340nm reveals, that their cup, but also an area at the bottom of the spathe reflects UV strongly. All that gets nicely visible.

I have previously written 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

[UV] Iris flower: Baader-U vs Jupiter-U filter for reflected UV ultraviolet photography

Again more about that new Jupiter-U filter of mine. Also those shots were taken today at the wonderfully blossoming Hermannshof, Weinheim, Germany. This time it is about a yellow Iris pseudacorus.

[click on image to see a larger one]

All triptychs are presented VIS left, Baader-U middle, Jupiter-U right:



A quite surprising find, since Iris' are usually not much UV reflective. This one however does quite strongly around 365nm.

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] Dianthus flower: 340nm Jupiter-U vs Baader-U for reflected UV ultraviolet photography

Again more about that new Jupiter-U filter of mine. Also those shots were taken today at the wonderfully blossoming Hermannshof, Weinheim, Germany. This is about Dianthus ("Coronation") and its specific UV reflectance.

[click on image to see a larger one]

All triptychs are presented VIS left, Baader-U middle, Jupiter-U right:

Dianthus plumarius ("Carnation"):


another Dianthus type:


Overview, again different ones:


The Jupiter-U filter reveals quite a bit more details than the longer wave Baader-U filter obviously.

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] Crab Spider on Geranium flower: Baader-U vs Jupiter-U filter for reflected UV ultraviolet photography

Again more about that new Jupiter-U filter of mine. Also those shots were taken today at the wonderfully blossoming Hermannshof, Weinheim, Germany. This time it is not only about flowers, also about an insect, a crab spider in that case.

[click on image to see a larger one]

Triptych: VIS left, UV using Baader-U filter middle, UV using Jupiter-U filter right:



Quite interesting how dark that spider looks like in UV on that flower. I would assume it uses its dark UV pattern to even enhance the attraction of that flower to its pollinators, hence directing its prey right to it!

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] 340nm Jupiter-U filter for short wave reflected UV (2)

Again more about that new Jupiter-U filter of mine. Shots taken today at the wonderfully blossoming Hermannshof Park, Weinheim, Germany.

[click on image to see a larger one]

All diptychs are presented VIS left, Jupiter-U right:

Gazania xx:


Rhododendron xx:


Pulsatilla vulgaris:


Taraxacum officinale:


That new filter renders quite differently; nicely golden actually.


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] more on 340nm Jupiter-U vs Baader-U filter for short wave reflected UV

Today more about that new Jupiter-U filter of mine vs. the Baader U (Venus) filter. Shots taken today at the wonderfully blossoming Hermannshof, Weinheim, Germany.

[click on image to see a larger one]

The Jupiter-U is a shorter wave filter (center is 340nm) and its transmission is this, as compared to the Baader (Venus) U filter (red line):


Here now some results of today:

Baader U2 left, Jupiter-U right:


VIS left, Baader U2 right:


VIS left, Jupiter-U right:


and another one:

Baader U2 left, Jupiter-U right:


VIS left, Baader U2 right:


VIS left, Jupiter-U right:


very subtle tone differences get visible in comparison to the Baader-U filter.


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] 340nm Jupiter-U filter for short wave reflected UV

Today about a new prototype filter of mine. It is called "Jupiter-U" and it is a shorter wave filter than the Baader U (Venus) filter, that I mainly use for reflected UV photography. Its center wavelength is around 340nm.

[click on image to see a larger one]

It is a shorter wave filter (center is 340nm) and its transmission is this, as compared to the Baader (Venus) U filter (red line): Here now some first impression about using the Jupiter-U filter. Target was a Gazania flower. Left: Venus U2, right Jupiter-U: Here VIS comparison shots: Baader-U (Venus U): Jupiter-U: Interesting to note the metallic golden rendering of leafs: Here now using a bred Kalanchoe floower in a quadriptych showing the VIS image (top left), Baader U2 (top right), Jupiter-U (bottom left), special 300-350nm filter (bottom right) and in more detail: If you look closer at the flower center, you'll notice only in the two shorter wave shots on the bottom a variation of reflectance (indicated by changing colors)

[To make things clear, this is a filter for my work, it is not for sale.]

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