Mirage — rebadged 100-200mm f/5.6 constant-aperture manual telephoto zoom for vintage SLRs
Mirage, a trade name on camera-shop lens racks across the UK and Europe through the 1970s and 1980s for rebadged Japanese optics, also sold a slower telephoto zoom to complement its primes. The 100-200mm f/5.6 was a budget-tier zoom for reach without the cost of a faster lens.
The 100-200mm f/5.6 is a manual-focus, manual-aperture zoom with a constant f/5.6 aperture through its range, sold across common SLR mounts of the period in the same manner as other trade-name catalogue lenses. Specific optical construction, weight and filter thread are not confirmed from available sources.
The constant-aperture design trades outright speed for a simpler, lighter build than variable-aperture rivals; sharpness is workmanlike stopped down but softens wide open, typical of budget zooms of the period.
These turn up cheaply secondhand, worth buying mainly for low-cost telephoto reach on a vintage manual-focus body. Check zoom action for smoothness, confirm the aperture ring is not loose, and inspect the glass for haze.