Vivitar 28–70mm f/3.4–4.8 MC Macro Focusing Zoom
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SQF data for 11x14 print size indicate very good performance at 28mm, good at 70mm. However, there was noticeable barrel distortion at 28mm (1.55 percent), and minimal pincushion at 50mm (0.45 percent) and 70mm (0.22 percent). At closest focusing distance of 13.5 inches (1:3.9) at 70mm, center sharpness was good at f/3.4, excellent from f/5.6 to f/16, and good at f/22. Corner sharpness was poor at f/3.4 to f/5.6, acceptable at f/8, very good from f/11 to f/16, and acceptable at f/22. Optimum performance was at f/11. |
CONCLUSION: Nearly professional results at extremely low prices. Fine for close-ups, center and edge, at moderate apertures. Note: Phoenix close-focusing at 1:3 is actually better than its 1:4 specs!
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