Infra-Red – Colour image comparisons for ‘new’ lenses

I have recently bought a couple of old (film era) wide-angle lenses for my infra-red photography. One thing that interested me was comparing the images produced by the old lenses with modern lenses. I took a photo, using a tripod, of a scene from my back garden, first using my good camera in colour, then switching cameras on the tripod to use the old lens in monochrome infra-red. I used a zoom lens to match, a close as possible, the focal length of the old lens.

What surprised me was how different the distortions were between the 2 lenses – the distortions made it impossible to line them up accurately. Here are slider comparisons for the 2 lenses. First is a 24mm lens:

Colour image
IR mono image

Now I show the 21mm lens:

Colour image
IR colour

At this size the distortions are hardly noticeable but for some of the purposes I intend to use them for they would be obvious. Care is needed!

Author: Paul L.G. Morris

I am an amateur photographer whose photography is mostly of gardens, nature and the rural environment. My specialities are close-ups, panoramic views, or a combination of both that I call 'Nearscapes'. I work mostly for my own interest having closed my business PM Studios Ltd.

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