Recently there has been a huge interest in my YouTube post using a normal Canon EOS 600D camera and converting it to Full spectrum, then blocking all but UV.
Many enquirers want to find a cheap way to convert a camera and then show how skin is damaged by the sun and how Sun cream blocks the UV Radiation.
There has been so much interest that I thought I would blog about it.
(Example video at the end of this blog)
Firstly, be careful with UV as it is dangerous. My preference is to take photos (and now video) under normal Sunlight.
This obviously rules out indoor photography.
If you modify flashes, install overhead UV lighting (even LED UV lights) be aware you are likely subjecting your model to cancer causing levels of UV.
They should be wearing sunglasses and sun cream (Which is not productive for this kind of work).
You really need full sun direct onto your subject.
Unless you purchase a purpose built UV band pass camera with expensive Quartz lenses, you are going to need to buy various items, have them modified and manually assemble.
There are 2 types of camera modifications I will mention.
- Converting a camera to Full spectrum
- Converting a camera to UV only
I have elected to convert my camera to full spectrum as it is cheaper and more useful for other types of photography.
As per my YouTube video (https://www.youtube.com/watch?v=UrvViq2Y7OE), this means someone modified the camera. They open the camera up, remove parts and filters.
Modern cameras are designed to block UV and Infrared. They are built to restrict the captured light to that same light we can naturally see with our eyes. We need to undo all this.
The camera’s sensor is able to see much lower and higher in bandwidth than our eyes.
Once the camera is full spectrum, the sensor is opened up to its full range including the visual spectrum.
This is the first step, modifying the body. The next step is lens selection and UV band pass filters.
If you want contact details for this body modification, I will pass along details for Ehab Eassa whom I have do my work. He can also modify point and shoot cameras.
I have a Canon EOS 600D converted to full spectrum. Many debate that Nikon is better for UV as it is more sensitive but with recent cameras, I think it makes little difference.
If you elect to go to the trouble of converting a camera to UV only (the other option), the final UV image is much crisper. It is a far more expensive process.
It is more rewarding as the images are in greyscale (avoiding the distraction of the pinkish colour from Full spectrum conversions) and the detail is far better with better contrast.
This is because a professional has removed the micro lenses from the sensor. The Micro Lenses are responsible for breaking the detected image up into the colours that will produce a colour image.
They make images colourful but reduce contrast. Removing these mean the sensor can only work with image data in its native format, black and white.
I have contacts that can sell you a camera with this already done to it.
Now, you have your next battle. Lenses.
Since the mid 1980’s, almost all lenses have a multicoating on it to stop light bouncing around inside the lens body causing flaring. It also reduces UV. This coating is on the front of the glass.
The other problem is glass. The more glass elements that are in the lens, the more that UV is reduced.
The more that UV is reduced, the longer your exposure needs to be and the higher the ISO to get an image.
I can’t buy any lenses made for my canon body that will not block UV. All lenses do.
My choices are
- Take a perfectly good lens and try and buff/scratch the UV multicoating off (The works but will reduce final image contrast).
- Buy an old lens and fit it with adapters.
- By a real UV lens made of quartz (Rare and very expensive). Nikon made one for a while.
I have gone with the second option. I have purchased old Enlarger lenses. These lenses are from the film days, used by film developers to expose film, to give you your little packet of photos.
They shine a light through the negative, through this lens, onto the final piece of film.
These lenses needed to be very faithful in reproducing the negative. They have no UV coatings and very few lens elements. They are at limited focal lengths.
I am using the EL Nikkor series of enlarger lenses, purchased from eBay.
I then have an adaptor to mount it to my canon mount.
As the lenses are not for Canon, the focal plane is not aligned with the correct focal distance so I use a bellows to get focus.
Now comes the easy part. You need a Bad pass filter for UV. This blocks all but UV. There is no visible light or IR leaking through my filter. Only UV. Even holding the lens to the sun, I can’t see through it.
I opted to buy a telescope accessory and some step up/step down rings to make it fit my lens. I have a BaaderU filter.
Now, you need to put it all together and can start looking at Video. at this point, this excersie will have easily cost over $1000 AUS/USD.
I note that in live view mode whilst talking a photo, I get a nice clean 720p video image, if I made the ISO high (6400), the shutter slow 8” and manually focus and set the lens to F4 or less (There is no electronic control of the lens settings).
The only issues are the sun reflecting off the live view screen made it hard to view and in live view and if you are not actively taking photos, it shuts off quickly.
In video mode, all the settings are Auto and I can’t see anything at all.
By setting the video mode to manual, I can control the ISO and the video format. I was able to record in 1080p. I also set the style to greyscale.
I now need to concentrate more on focus and use a tripod (You can zoom in in live view to check your focus).
My other options I have yet to play with are Magic Lantern and recording from live view mode in 720p.
Here are the next steps to explore
Capture 720P HD With Any LiveView Capable Canon Camera
The Canon 600D is supported by magic lantern and has some additional video control
I will note that my sensor is not sensitive enough for high frame rate however, given the budget I am working with, the result is quite good.
Here is an example of what my setup can produce