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Full Spectrum -UV -720nm = ?

  • Writer: Steven Farmer
    Steven Farmer
  • Jun 14, 2019
  • 2 min read

Recently I've rekindled interest in my Pentax K-01 Full spectrum camera.


I decided to go for a walk with my K-01, my Pentax 35-80, a 720nm Filter and for a change of pace a standard cheap UV filter.


quick science lesson for anyone who is interested


The light spectrum from UV to IR

humans can only see the visible light.

Cameras like on your phone can see more than this.

Next time your TV remote doesn't work get your phone and point the camera at the end and push a button on the remote. If the remote is working the camera should pick something up like so

A phone camera showing the IR coming from a TV remote

Current day DSLR or Mirror-less cameras have an IR blocker in them so The IR doesn't show up on all of our photos.


As my Pentax K-01 has been modified it sees the full spectrum of light. Hence the name Full Spectrum


So if my camera sees the whole spectrum of light and I put a 720nm filter over it its now seeing less of the spectrum. So if I put a UV filter on as well it should see even less of the spectrum.




I was a little surprised to what it did see.



This is the church in my local town centre. A nice building that I walk past daily I photograph it regularly. The detail is nice, the sky a bit flat, the leaves a nearly shining white, however for a test image not too bad.


People try to tell us what looks good in IR. Scenery, Astro photography an stuff like that.


Why not photograph what I want too and see what happens.


I had to go visit my mother and drop her a print I had got done for her. lovely little Geoffrey.

Still having a key to her house I decided to go round and leave it for her.

Unbeknown to me she was actually at home.

So I sat down and had a drink and a quick chat.


Walking into the kitchen I hear a meow at the back door.

I open up and in walks Geoffrey.

I have a little fuss and like cats always do.....he wanted to go out again.


I followed Geoffrey into the garden and decided to see if he wanted to play.


He soon stuck his tongue out at me




Cheeky Geoffrey

I followed him round the garden a bit. He gave me a few funny looks.


If someone had asked me 6 months go "will you be following your mums cat around the garden with an IR camera" I probably would have laughed



I love this photo, The look in his eyes, the colour his eyes have kept.

Both these photos have minimal editing. No channel swapping, No filter, no sepia tones. This is how the camera captured it.


Does this photo work in IR?

Would you say this is a good photo?

Would you want this printed in a photo album or hung on your wall?



Thank you for reading my blog post.


Let me know what you think of my IR photo experimentation.




Steven :)




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