Friday, October 23, 2020

Reflected UV photography + videography using a MCP Amplified Camera System II

Today about an experiment I have done, using a light amplification device in front of a normal visible light camera for recording reflected UV footage. This device uses a MCP (multi channel plate) with UV sensitive photocathode (approx. 190nm - 650nm), amplifies light by approx. 20-50.000 and shows the resulting image on a green phosphor screen. 

Using a suitable optical system, I relayed this image to my normal, visible light camera. UV filter used was a fully IR blocked (OD6) UV transmission filter (peak at 250nm). Taget was a tea candle.

 Using a f3.5/50mm quartz fluorite lens:

 

This system shows quite some usefulness, especially under low light conditions, or when it is about recording deeper in UV where a normal full spectrum camera is not sensitive anymore.

I have written about this system doing still UV photography HERE.

I have done similar with a different amplified camera system before which did not allow to have an external camera attached, with just a TV output 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, October 9, 2020

Lichen: human vision vs UV induced visible fluorescence vison and reflected UV ultraviolet photography II

Today more about that piece of bark with Lichen growing on it (most likely Xanthoria parietina and Physcia adscendens grown into each other), that I found blown over onto my balcony. Closeup shots in reflected UV, visible light and simulated insect vision were done using my UV-Nikkor 105mm quartz/fluorite lens as well as another quartz-fluorite lens reversed as a multispectral diopter. Filters used were the UV Baader-U filter and my usual XBV filters. My modified Xenon flash was used as a light source. 

 
[click on image to see a larger one]

Human vision image using UV/IR Cut filter:


Reflected UV image:


Simulated Butterfly vision image:


Simulated Bee vision image:


Quadriptych VIS, UV,  BV. BU:



So this Lichen bark in closeup was a quick experiment, quite some room for improvement of course, possibly using stacking in future for more DOF.

I have written more about that 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, October 4, 2020

Full Moon over Weinheim Castle: multispectral photography II

Here today shots of the full Harvest Moon over Windeck castle here in my hometown Weinheim Germany. Shots were done in full spectrum mode (i.e. mainly infrared) and in reflected ultraviolet using Baader-U filter. Lens used was my UV-Nikkor 105mm quartz fluorite lens. Light source was moonlight resp. the castle lighting system. All shots were done at approx. f8. No later whitebalancing was done, pictures straight out of the camera.

[click on image to see a larger one]

IR image: 

 

UV image: 

 


Full moon is always special and first I was sad to see all the clouds, but then it turned out quite nicely and all that drama got nicely visible.

I have more moon shots HERE.


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