Fidgeting with Focal Length

New life and speed for old glass and new glass too….

'Couv' Camera

Last time I mentioned focal reducers and I thought I would go over them in detail this time round. Focal reducers are in essence the opposite of a tele-converter. Rather than increasing the effective focal length of a lens they decrease the effective focal length of the lens. How do they work and are they any good? Let’s find out.

First I want to start with tele-converters as they have been around in photography much longer. These are often referred to as “doublers” because the most common ones effectively doubled the focal length. I call it ‘effective’ because the lens focal length does not physically change. With a tele-converter the way the focal length is “doubled” is by having a lens assembly that crops away 75% of the image and then projects the remaining 25% in the center across the entire sensor or film. Because 75% is cropped away, the…

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