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UltravioletPhotography

The Leaning Tower of Pisa (and surroundings)


Stefano

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Photos taken September 11th, 2019.

 

UV: full spectrum Panasonic DMC-F3, ZWB2 (2 mm) + BG39 (2 mm). In sunlight, with this combination, I can see from ~365 to 400 nm.

VIS: (unmodified) Samsung Galaxy A5 2016 (rear camera).

IR: (unmodified) Samsung Galaxy A5 2016 (rear camera), black pen ink filter.

 

First some comparisons:

 

 

View on top of the tower:

 

UV (f-stop: f/2.8, ISO 1600, 1/30 s exposure).

post-284-0-40058500-1580594862.jpg

 

VIS (f-stop: f/1.9, ISO 40, 1/2179 s exposure).

post-284-0-49065900-1580595095.jpg

 

IR (f-stop: f/2.8, ISO 250, 1/8 s exposure).

post-284-0-43150200-1580595151.jpg

 

 

Flag on top of the tower:

 

UV (f-stop: f/2.8, ISO 1600, 1/50 s exposure).

post-284-0-90818500-1580595274.jpg

 

VIS (f-stop: f/2.8, ISO 40, 1/2667 s exposure).

post-284-0-82974700-1580595551.jpg

 

IR (f-stop: f/2.8, ISO 1000, 1/33 s exposure).

post-284-0-99932600-1580595366.jpg

 

 

Pisa Cathedral:

 

UV (f-stop: f/2.8, ISO 1600, 1/50 s exposure).

post-284-0-08359400-1580595744.jpg

 

VIS (incredibly, I can not find the visible photo. If I find it I will post it. This is VERY annoying).

 

IR (f-stop: f/1.9, ISO 320, 1/8 s exposure).

post-284-0-40002800-1580598418.jpg

 

 

Bells:

 

UV (f-stop: f/2.8, ISO 1600, 1/30 s exposure).

post-284-0-87697100-1580598704.jpg

 

VIS (f-stop: f/1.9, ISO 40, 1/2092 s exposure).

post-284-0-93525100-1580598721.jpg

 

IR (f-stop: f/1.9, ISO 1000, 1/33 s exposure).

post-284-0-96760000-1580598789.jpg

 

 

And some other photos...

 

Glass cover (the tower is hollow). F-stop: f/2.8, ISO 1600, 1/8 s exposure.

post-284-0-46326600-1580598916.jpg

 

Same settings.

post-284-0-77359300-1580599017.jpg

 

 

The entire tower.

 

UV. F-stop: f/2.8, ISO 1600, 1/100 s exposure.

post-284-0-21053800-1580599069.jpg

 

 

People from the tower:

 

UV. F-stop: f/2.8, ISO 1600, 1/15 s exposure.

post-284-0-42166800-1580599205.jpg

 

 

Can you spot the dandelions?

 

UV. F-stop: f/2.8, ISO 1600, 1/8 s exposure.

post-284-0-01749300-1580599371.jpg

 

COMMENTS AND NOTES:

 

1) You may see a dark corner in the upper right corners in UV photos. That was the tape used to hold the filter, which entered the camera's field of view.

2) ISO 1600 is the maximum ISO my Panasonic allows. That's why UV images are noisy.

3) The quality of the IR pictures is limited by a lot of factors (the camera and the filter I used). In the future I will have much better filters.

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Stefano, Interesting photos! :-)

I have other photos taken that day, but I didn't post them because I didn't want to make this topic too heavy to load.
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Your lens has a vicious IR hotspot! I am curious when they reopened the tower--I heard it was closed for a number of years and there were fears for its stability.
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I wonder if the Tower has ever been photographed in UV before. As Cadmium says, interesting set.

I too wonder that. There aren't a lot of people who go around shooting in UV. There are more who do IR.
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Your lens has a vicious IR hotspot! I am curious when they reopened the tower--I heard it was closed for a number of years and there were fears for its stability.

It was reopened years ago, but I have to check this.
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Other images...

 

UV

 

f-stop: f/2.8, ISO 1600, 1/8 s exposure.

post-284-0-25266900-1580652899.jpg

 

 

VIS

 

f-stop: f/1.9, ISO 40, 1/732 s exposure.

post-284-0-34329400-1580652686.jpg

 

 

IR

 

f-stop: f/1.9, ISO 200, 1/8 s exposure.

post-284-0-26491800-1580652697.jpg

 

 

VIS

 

f-stop: f/1.9, ISO 40, 1/1550 s exposure.

post-284-0-07226900-1580652717.jpg

 

 

IR

 

f-stop: f/1.9, ISO 200, 1/8 s exposure.

post-284-0-04644900-1580652726.jpg

 

 

UV

 

f-stop: f/2.8, ISO 1600, 1/8 s exposure.

post-284-0-27912300-1580653050.jpg

 

 

UV

 

f-stop: f/2.8, ISO 1600, 1/8 s exposure.

post-284-0-16668900-1580653127.jpg

 

 

UV

 

f-stop: f/2.8, ISO 1600, 1/100 s exposure.

post-284-0-14898400-1580653221.jpg

UV

 

f-stop: f/2.8, ISO 1600, 1/8 s exposure.

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Stefano, nice pictures here. Are you converting the UV to monochrome? I would expect to see at least some flashes of purple in these shots. Otherwise you probably aren’t getting all the way to 365nm in sunshine (you might with LED). The sunshine falls off very fast in UV so if your lens cuts off at 365, you probably only get 380-400nm in sun. That was my experience when I converted a Nikon Coolpix 950, which was also a fixed lens camera.
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All UV images are color images. Sometimes I get some purple and yellow, but my colors are very light.

 

https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.ultravioletphotography.com/content/index.php/topic/3601-strange-spectrums-with-a-diffraction-grating/page__st__20&ved=2ahUKEwi-2tevjbPnAhWR5KQKHUT1AWkQFjAYegQIAxAB&usg=AOvVaw1H6_odijLOI8Fku_r8cyEL Here I did tests with this filter and sunlight, and I got the result that I can see from approx. 365 nm to 400 nm in sunlight.

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No, you won’t see any of that 365-380nm in an ordinary photograph. When you separate out the spectrum, the different wavelengths aren’t competing with each other. But in a photo of anything other than a grating, you can only see the brightest parts. Everything else is drowned out. (Eg if something reflects 365 and 380, the 365 is so much dimmer that all you get is the 380.)

 

Take a look at this thread to see the effect of lens cutoff:

https://www.ultravioletphotography.com/content/index.php/topic/3304-valdemarsvik-sweden/page__view__findpost__p__27880

 

He tests a Super Takumar 28mm in the second post that shows the lens cuts near 380nm.

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Low chromaticity is a sign of narrow bandpass--usually, there will be noticeable color differences within the image if wavelengths below 370 are being recorded.
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It may be that my filter-lens combination doesn't pass a wide band of UV, but I got strong colors with my 365 nm LED, which is basically a very narrow peak with some contour between 360 and 400 nm.
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Yes, for the LED it will work because there is nothing competing with it in the 390 range. It’s specifically with sunshine that you will drown out the 365nm. Narrowband sources like LEDs will poke through.
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