Vivitar — 90-230mm f/4.5 early one-touch push-pull telephoto zoom, multi-mount vintage SLR
The Vivitar 90-230mm f/4.5 dates from the era when push-pull telephoto zooms first became mainstream SLR accessories, offered by Vivitar as an affordable long-reach alternative to separate telephoto primes. It was part of the brand's early expansion into zoom optics via Japanese contract manufacturers.
It uses a one-touch push-pull zoom and focus ring and an automatic diaphragm for open-aperture metering on compatible bodies. As with most Vivitar zooms from this period, the same optical design was fitted with different lens mounts so the lens could be bought for whichever SLR system a customer owned.
Image quality is soft wide open and at the long end, tightening up by mid apertures, which was typical for early consumer zoom designs. Its main appeal is versatility rather than resolving power, letting a single lens cover portrait, travel and casual wildlife framing without a lens change.
These zooms are inexpensive on the used market today and often show wear from decades of use. Check the push-pull action for looseness or grinding, look for haze or fungus in the long optical path, and verify the mount fitted matches the camera before buying, since several mount versions exist.