Vivitar Series 1 90-180mm f/4.5 Flat Field

The lens has 19 elements in 15 groups, which means it has complex optics that can produce sharp and detailed images. The lens coating helps to reduce reflections and flare, which can improve image quality. It was manufactured in the past, so it may not be as readily available as newer lenses. The maximum aperture of f/4.5 is not as wide as some other lenses, but it can still produce good bokeh (blurred background) when used correctly. The build quality of the lens is good, which means it can withstand some wear and tear. The lens has a flat field design, which means it can produce sharp images across the entire frame, even at the edges. Overall, the Vivitar Series 1 90-180mm f/4.5 Flat Field lens is a good option for those looking for a telephoto zoom lens with good optics and build quality. There are other alternatives available in the market, but this lens can still produce good results when used correctly.

Optical design

Great choice mainly for good light conditions Has 6 aperture blades, this number of blades are commonly used. Having rounded blades provides out of focus circle shape closer to a circle.

Physical characteristics

Weights 1090 grams so it is a heavy lens, consider using its own lens bag. 158 mm long, with this size carry only if you use it. With a lens filter diameter of 72 mm you are one step from the next standard filter size, buy step-up ring and bigger filter but you can chose from plenty options.