Visible light and Infrared comparison using Rollei Infrared 400.
Filter: Heliopan RG715. Film developed in PaRodinal 1:25, 8:11min @ 18.9ºC.
Rollei IR 400, EI 400 (6-12 for IR)
Cool results, I've just bought some rollei 400 IR film, but don't own a filter. I assume the second is with the filter? Are they expensive and how do you meter?
Some frames from a roll of Tri-X and Olympus XA. This is really a great tiny camera, a shame that I don't use it more. Thought I had lost the scans, but they were copied to another disc.
R.Young wrote:
Cool results, I've just bought some rollei 400 IR film, but don't own a filter. I assume the second is with the filter? Are they expensive and how do you meter?
Thank you. Yes the second image is the infrared image. The 715nm IR filters are not that expensive. I would recommend HOYA or Heliopan. The Hoyas are called R72 if I recall correctly, and the Heliopan, RG715. At B&H the Heliopans are twice the price of Heliopan, and I have to say the Heliopans aren't worth the premium here.
I shoot the IR400 at EI 6 and 12 for IR, using a hand held spot meter.
hmzimelka wrote:
Thank you. Yes the second image is the infrared image. The 715nm IR filters are not that expensive. I would recommend HOYA or Heliopan. The Hoyas are called R72 if I recall correctly, and the Heliopan, RG715. At B&H the Heliopans are twice the price of Heliopan, and I have to say the Heliopans aren't worth the premium here.
I shoot the IR400 at EI 6 and 12 for IR, using a hand held spot meter.
R.Young wrote:
Ok, how much light do the IR filters cut?
The Heliopan RG715 filters cuts 5 stops (as per instructions) but actual compensation is dependent on sensitivity of the film and the amount of IR light in the region. In Namibia and South Africa, an EI of 6 (6 stop compensation) or EI of 12 (5 stop compensation) is plenty.
Just figure out the the developing time and exposure index for visible light first, and then start determining the best IR exposure index. It's simply the best way to get to know the film since IR light is not always very consistent.
