Table lamp

Just got a Hoya Infrared R72 filter to play with. Didn't realise quite how dense it appears - only passing infrared rays above 720 nm.  

It has a filter factor of 16, so my 200 iso film becomes iso12.
Working at f/16 or f/22 means long exposures!!

This is an abstract of our table lamp - 20 sec exposure.
I'm going to play with some Ilford 200 SFX film. Obviously my DSLR isn't converted to IR (still has a infrared blocking filter infront of the sensor)  so this pic was never going to work using inbuilt light meter :-(

Maybe its a nice abstract ..... 




https://www.darkroomdave.com/tutorial/using-ilford-sfx-infra-red-film/


From Darkroom Dave..
"Infra-red can also be useful on hazy days since it cuts through it and can almost make it appear to be a clear day! It is essential to use a tripod with SFX since, although the film is rated at ISO 200 on the box, when the IR filter is used this needs an extra 4 to 6 stops of exposure, depending on how much IR is present. In other words, an actual rating of between 3 to 12 ISO should be used. I use manual adjustment of the exposure to add 6 stops to the exposure.

Use an aperture of f22 or f16 to avoid any focussing problems that will otherwise be seen (IR light focuses in a slightly different place to visible light).

Bracket exposures over a range of 3 stops or so since the recording of IR on film is rather unpredictable! Exposure times are often in the range 0.5 to 4 seconds at f22."